The 2012 Impreza Obd2 Port is typically located under the dashboard on the driver’s side, making it easily accessible for diagnostic checks. MERCEDES-DIAGNOSTIC-TOOL.EDU.VN offers detailed guides and diagnostic tools to help you quickly locate and utilize this port for efficient vehicle maintenance. Utilizing our resources ensures you can diagnose issues promptly, leading to improved car performance and preventative maintenance, ultimately saving time and money.
Contents
- 1. Understanding the OBD2 Port in Your 2012 Impreza
- 1.1. What is an OBD2 Port?
- 1.2. Why is the OBD2 Port Important?
- 1.3. Common Uses of the OBD2 Port
- 1.4. OBD2 Port and Vehicle Maintenance
- 2. Locating the OBD2 Port in Your 2012 Subaru Impreza
- 2.1. Step-by-Step Guide to Finding the OBD2 Port
- 2.2. Common Locations Within the 2012 Impreza
- 2.3. Tips for Easy Identification
- 2.4. What to Do If You Can’t Find It
- 3. Choosing the Right OBD2 Scanner for Your 2012 Impreza
- 3.1. Types of OBD2 Scanners
- 3.2. Key Features to Look For
- 3.3. Top OBD2 Scanner Recommendations for 2012 Impreza
- 3.4. Considerations for Subaru-Specific Codes
- 4. Diagnosing Common Issues Using the OBD2 Port
- 4.1. Reading Diagnostic Trouble Codes (DTCs)
- 4.2. Common Trouble Codes and Their Meanings
1. Understanding the OBD2 Port in Your 2012 Impreza
The On-Board Diagnostics II (OBD2) port is a standardized interface used in most modern vehicles, including the 2012 Subaru Impreza, for accessing the vehicle’s computer system. It allows mechanics and car owners to retrieve diagnostic trouble codes (DTCs), monitor vehicle performance, and ensure the car is running efficiently. Understanding the location and function of this port is crucial for maintaining your vehicle’s health.
1.1. What is an OBD2 Port?
The OBD2 port, short for On-Board Diagnostics II port, is a standardized port found in virtually all cars and light trucks sold in the United States after 1996. Its primary function is to provide access to the vehicle’s engine control unit (ECU) and other computer systems. This access enables mechanics and car owners to diagnose problems, read sensor data, and even reprogram certain vehicle functions. According to the Environmental Protection Agency (EPA), the OBD2 system was mandated to ensure vehicles meet emission standards, making it a critical component for vehicle maintenance.
1.2. Why is the OBD2 Port Important?
The OBD2 port is important for several reasons:
- Diagnostics: It allows technicians to quickly identify issues by reading diagnostic trouble codes (DTCs).
- Monitoring: It provides real-time data about the vehicle’s performance, such as engine temperature, speed, and fuel consumption.
- Maintenance: It helps in performing routine maintenance tasks and ensuring the vehicle operates efficiently.
- Emissions: It ensures the vehicle complies with environmental regulations by monitoring emissions-related systems.
The OBD2 port acts as a gateway to your car’s internal systems, providing valuable insights into its health and performance. Regular use of this port with the right tools can help you prevent major issues and extend the life of your vehicle.
1.3. Common Uses of the OBD2 Port
The OBD2 port is used for a variety of purposes, including:
- Reading Diagnostic Trouble Codes (DTCs): When your check engine light comes on, the OBD2 port can be used to retrieve the specific code indicating the problem.
- Clearing Trouble Codes: After fixing an issue, you can use the OBD2 port to clear the trouble code and reset the check engine light.
- Monitoring Live Data: You can monitor real-time data from various sensors in your vehicle, such as engine speed, coolant temperature, and oxygen sensor readings.
- Performing Emissions Tests: Many states use the OBD2 port to perform emissions tests, ensuring vehicles comply with environmental standards.
- Reprogramming the ECU: In some cases, the OBD2 port can be used to reprogram the ECU for performance tuning or software updates.
1.4. OBD2 Port and Vehicle Maintenance
Regular use of the OBD2 port can significantly enhance your vehicle maintenance routine. By periodically scanning your vehicle for trouble codes and monitoring live data, you can identify potential issues before they escalate into major problems. This proactive approach can save you time and money on costly repairs. Moreover, understanding the data from your OBD2 port can help you optimize your driving habits for better fuel efficiency and overall vehicle performance.
2. Locating the OBD2 Port in Your 2012 Subaru Impreza
Finding the OBD2 port in your 2012 Subaru Impreza is usually straightforward. It is typically located under the dashboard on the driver’s side. However, the exact position can vary slightly depending on the vehicle model and trim. Here’s a step-by-step guide to help you locate it:
2.1. Step-by-Step Guide to Finding the OBD2 Port
- Check Under the Dashboard:
- Start by looking under the dashboard on the driver’s side. The port is usually near the steering column or close to the center console.
- Look for a Trapezoid-Shaped Connector:
- The OBD2 port is typically a 16-pin trapezoid-shaped connector. It’s usually black or grey.
- Use a Flashlight:
- If the area is dark, use a flashlight to illuminate the space under the dashboard. This will help you spot the port more easily.
- Feel Around:
- If you can’t see the port immediately, try feeling around under the dashboard. It might be tucked away slightly.
- Consult Your Owner’s Manual:
- If you still can’t find it, consult your vehicle’s owner’s manual. It should have a diagram indicating the exact location of the OBD2 port.
2.2. Common Locations Within the 2012 Impreza
In the 2012 Subaru Impreza, the OBD2 port is most commonly found in one of the following locations:
- Below the Steering Wheel: Directly under the steering wheel column, often near the hood release lever.
- Near the Center Console: On the driver’s side, close to the center console.
- Inside a Small Compartment: Sometimes, the port may be hidden inside a small compartment or behind a panel.
2.3. Tips for Easy Identification
To make identifying the OBD2 port easier, keep these tips in mind:
- Look for the Standard Shape: Remember that the OBD2 port has a unique 16-pin trapezoid shape.
- Check for Markings: Some ports may have “OBD2” or a similar label nearby.
- Use Online Resources: If you’re still having trouble, search online forums or vehicle-specific websites for images or diagrams showing the exact location in a 2012 Impreza.
2.4. What to Do If You Can’t Find It
If you’ve followed these steps and still can’t locate the OBD2 port, consider the following:
- Professional Help: Visit a local mechanic or auto parts store. They can quickly locate the port for you.
- Online Communities: Join online Subaru communities or forums. Other Impreza owners may have encountered the same issue and can offer specific advice.
3. Choosing the Right OBD2 Scanner for Your 2012 Impreza
Once you’ve located the OBD2 port, the next step is to choose an appropriate OBD2 scanner. The market offers a wide range of scanners, from basic code readers to advanced diagnostic tools. Selecting the right one depends on your needs and budget.
3.1. Types of OBD2 Scanners
There are several types of OBD2 scanners available:
- Basic Code Readers: These are the simplest and most affordable scanners. They can read and clear diagnostic trouble codes (DTCs).
- Mid-Range Scanners: These offer additional features such as live data monitoring, freeze frame data, and the ability to perform some basic tests.
- Advanced Diagnostic Tools: These are professional-grade scanners that offer advanced features such as bidirectional control, ECU programming, and access to manufacturer-specific codes.
- Smartphone-Based Scanners: These consist of an OBD2 adapter that plugs into the port and communicates with a smartphone app via Bluetooth or Wi-Fi.
3.2. Key Features to Look For
When choosing an OBD2 scanner, consider the following features:
- Compatibility: Ensure the scanner is compatible with the 2012 Subaru Impreza.
- Ease of Use: Look for a scanner with an intuitive interface and clear instructions.
- Functionality: Determine which features you need, such as live data monitoring, code clearing, and advanced diagnostics.
- Updateability: Choose a scanner that can be updated with the latest software and vehicle data.
- Price: Set a budget and find a scanner that offers the best value for your money.
3.3. Top OBD2 Scanner Recommendations for 2012 Impreza
Here are a few OBD2 scanner recommendations for the 2012 Subaru Impreza:
| Scanner Type | Brand/Model | Key Features | Price |
|---|---|---|---|
| Basic Code Reader | Autel AutoLink AL319 | Reads and clears DTCs, displays I/M readiness status, retrieves vehicle information (VIN, CIN, CVN). | $30-50 |
| Mid-Range Scanner | Innova 3100j | Reads and clears DTCs, ABS codes, live data, freeze frame data, battery and alternator test. | $80-120 |
| Advanced Tool | Snap-On Solus Edge | Comprehensive diagnostics, bidirectional control, ECU programming, access to manufacturer-specific codes. | $2,000+ |
| Smartphone Scanner | OBDLink MX+ | Reads and clears DTCs, live data, advanced diagnostics, compatible with iOS and Android, Bluetooth connectivity. | $100-150 |
| Professional Scanner | Launch X431 V+ | Full system diagnostics, ECU coding, actuation tests, supports a wide range of vehicle makes and models. | $1,000+ |
| Bluetooth Adapter | Veepeak Mini Bluetooth OBD2 | Compact size, Bluetooth connectivity, compatible with various OBD2 apps, reads and clears codes. | $20-40 |
| Enhanced Diagnostic | BlueDriver Bluetooth Pro OBDII | Reads and clears enhanced codes (ABS, SRS, TPMS), live data, freeze frame, vehicle-specific repair reports. | $120-160 |
| Wireless Scanner | FIXD Sensor | Monitors vehicle health in real-time, provides maintenance alerts, predicts future issues, easy to install and use. | $50-70 |
| Code Reader with LCD | Actron CP9600 | Large color display, reads and clears codes, live data, ABS codes, oil reset, battery reset. | $150-200 |
| All-in-One Scanner | Bosch ADS 625 | Comprehensive diagnostics, ECU programming, ADAS calibration, cloud-based software updates. | $3,000+ |
3.4. Considerations for Subaru-Specific Codes
Subaru vehicles, including the 2012 Impreza, may have manufacturer-specific diagnostic codes. To read these codes, you’ll need a scanner that supports Subaru-specific protocols. Many advanced and professional-grade scanners offer this capability. Check the scanner’s specifications to ensure it supports Subaru-specific codes before making a purchase.
4. Diagnosing Common Issues Using the OBD2 Port
Using the OBD2 port, you can diagnose a variety of common issues in your 2012 Subaru Impreza. Understanding how to interpret the diagnostic trouble codes (DTCs) can help you identify problems quickly and efficiently.
4.1. Reading Diagnostic Trouble Codes (DTCs)
When your check engine light illuminates, the first step is to read the diagnostic trouble codes (DTCs). Here’s how to do it:
- Plug in the Scanner: Connect the OBD2 scanner to the port.
- Turn on the Ignition: Turn the ignition key to the “ON” position without starting the engine.
- Power on the Scanner: Turn on the OBD2 scanner and follow the on-screen instructions.
- Read the Codes: Select the option to read trouble codes. The scanner will display any stored DTCs.
- Record the Codes: Write down the codes and their descriptions for further investigation.
4.2. Common Trouble Codes and Their Meanings
Here are some common trouble codes that you might encounter in your 2012 Subaru Impreza:
| Code | Description | Possible Causes |
|---|---|---|
| P0420 | Catalyst System Efficiency Below Threshold | Faulty catalytic converter, faulty oxygen sensor, exhaust leak, engine misfire. |
| P0171 | System Too Lean (Bank 1) | Vacuum leak, faulty MAF sensor, faulty oxygen sensor, fuel pump issues, clogged fuel filter. |
| P0301 | Cylinder 1 Misfire Detected | Faulty spark plug, faulty ignition coil, faulty fuel injector, vacuum leak, low compression. |
| P0442 | Evaporative Emission Control System Leak | Leaking fuel cap, damaged fuel tank, faulty EVAP system components (e.g., purge valve, vent valve). |
| P0011 | A Camshaft Position Timing Over-Advanced | Faulty camshaft position sensor, low engine oil level, oil viscosity issues, problems with the variable valve timing (VVT) system. |
| P0128 | Coolant Thermostat Below Regulating Temp | Defective thermostat, faulty engine coolant temperature sensor, cooling system issues. |
| P0500 | Vehicle Speed Sensor Malfunction | Faulty vehicle speed sensor (VSS), wiring issues, problems with the anti-lock braking system (ABS). |
| P0102 | Mass Air Flow Circuit Low Input | Dirty or faulty mass airflow (MAF) sensor, intake leak, wiring issues. |
| P0455 | EVAP Emission Control System Leak (Large) | Missing or faulty fuel cap, damaged fuel tank, large leak in the EVAP system, faulty EVAP components. |
| P0300 | Random/Multiple Cylinder Misfire Detected | Worn spark plugs, faulty ignition coils, vacuum leaks, low fuel pressure, faulty mass airflow sensor (MAF), defective crankshaft or camshaft sensor. |
| P0113 | Intake Air Temperature Sensor High Input | Faulty Intake Air Temperature (IAT) sensor, wiring issues, loose connections. |
| P0131 | O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1) | Faulty oxygen sensor, exhaust leaks, wiring issues. |
| P0135 | O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1) | Faulty oxygen sensor heater, wiring issues, defective PCM. |
| P0137 | O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2) | Faulty oxygen sensor, exhaust leaks, wiring issues. |
| P0141 | O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) | Faulty oxygen sensor heater, wiring issues, defective PCM. |
| P0172 | System Too Rich (Bank 1) | Faulty oxygen sensor, high fuel pressure, leaky fuel injectors, defective mass airflow sensor (MAF). |
| P0302 | Cylinder 2 Misfire Detected | Worn spark plugs, faulty ignition coils, vacuum leaks, low fuel pressure, faulty mass airflow sensor (MAF), defective crankshaft or camshaft sensor. |
| P0303 | Cylinder 3 Misfire Detected | Worn spark plugs, faulty ignition coils, vacuum leaks, low fuel pressure, faulty mass airflow sensor (MAF), defective crankshaft or camshaft sensor. |
| P0304 | Cylinder 4 Misfire Detected | Worn spark plugs, faulty ignition coils, vacuum leaks, low fuel pressure, faulty mass airflow sensor (MAF), defective crankshaft or camshaft sensor. |
| P0401 | Insufficient EGR Flow | Blocked EGR passages, faulty EGR valve, defective EGR pressure sensor, vacuum leaks. |
| P0402 | Excessive EGR Flow | Faulty EGR valve, defective EGR pressure sensor, vacuum leaks. |
| P0410 | Secondary Air Injection System Malfunction | Faulty air pump, defective check valve, clogged air passages, wiring issues. |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) | Faulty catalytic converter, exhaust leaks, defective oxygen sensor, engine misfires. |
| P0440 | EVAP Emission Control System Malfunction | Leaky fuel cap, damaged fuel tank, faulty EVAP system components (e.g., purge valve, vent valve). |
| P0446 | EVAP Vent Control System Malfunction | Faulty vent valve, clogged vent line, wiring issues. |
| P0451 | EVAP Pressure Sensor Range/Performance | Faulty pressure sensor, clogged EVAP lines, vacuum leaks. |
| P0456 | EVAP System Leak Very Small | Leaky fuel cap, small leak in EVAP system hoses, faulty EVAP components. |
| P0505 | Idle Air Control System Malfunction | Faulty IAC valve, vacuum leaks, carbon buildup in throttle body. |
| P0506 | Idle Air Control System RPM Lower Than Expected | Faulty IAC valve, vacuum leaks, carbon buildup in throttle body. |
| P0507 | Idle Air Control System RPM Higher Than Expected | Faulty IAC valve, vacuum leaks, carbon buildup in throttle body. |
| P0600 | Serial Communication Link Malfunction | Wiring issues, faulty PCM. |
| P0700 | Transmission Control System Malfunction | Faulty shift solenoids, defective transmission sensors, low transmission fluid. |
| P0705 | Transmission Range Sensor Circuit Malfunction | Faulty transmission range sensor, wiring issues, shift linkage problems. |
| P0711 | Transmission Fluid Temperature Sensor Range/Performance | Faulty temperature sensor, low transmission fluid, wiring issues. |
| P0712 | Transmission Fluid Temperature Sensor Low Input | Faulty temperature sensor, wiring issues. |
| P0713 | Transmission Fluid Temperature Sensor High Input | Faulty temperature sensor, wiring issues. |
| P0715 | Input/Turbine Speed Sensor Circuit Malfunction | Faulty speed sensor, wiring issues. |
| P0717 | Input/Turbine Speed Sensor Circuit No Signal | Faulty speed sensor, wiring issues. |
| P0720 | Output Speed Sensor Circuit Malfunction | Faulty speed sensor, wiring issues. |
| P0722 | Output Speed Sensor Circuit No Signal | Faulty speed sensor, wiring issues. |
| P0730 | Incorrect Gear Ratio | Low transmission fluid, faulty shift solenoids, internal transmission damage. |
| P0740 | Torque Converter Clutch Circuit Malfunction | Faulty torque converter, defective solenoid, wiring issues. |
| P0741 | Torque Converter Clutch Circuit Performance or Stuck Off | Faulty torque converter, defective solenoid, wiring issues. |
| P0743 | Torque Converter Clutch Circuit Electrical | Faulty torque converter, defective solenoid, wiring issues. |
| P0750 | Shift Solenoid A Malfunction | Faulty shift solenoid, wiring issues. |
| P0753 | Shift Solenoid A Electrical | Faulty shift solenoid, wiring issues. |
| P0755 | Shift Solenoid B Malfunction | Faulty shift solenoid, wiring issues. |
| P0758 | Shift Solenoid B Electrical | Faulty shift solenoid, wiring issues. |
| P0760 | Shift Solenoid C Malfunction | Faulty shift solenoid, wiring issues. |
| P0763 | Shift Solenoid C Electrical | Faulty shift solenoid, wiring issues. |
| P0765 | Shift Solenoid D Malfunction | Faulty shift solenoid, wiring issues. |
| P0768 | Shift Solenoid D Electrical | Faulty shift solenoid, wiring issues. |
| P0770 | Shift Solenoid E Malfunction | Faulty shift solenoid, wiring issues. |
| P0773 | Shift Solenoid E Electrical | Faulty shift solenoid, wiring issues. |
| P0775 | Pressure Control Solenoid Malfunction | Faulty pressure control solenoid, wiring issues. |
| P0778 | Pressure Control Solenoid Electrical | Faulty pressure control solenoid, wiring issues. |
| P0780 | Shift Malfunction | Low transmission fluid, faulty shift solenoids, internal transmission damage. |
| P0841 | Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance | Faulty pressure sensor, low transmission fluid, wiring issues. |
| P0842 | Transmission Fluid Pressure Sensor/Switch A Circuit Low | Faulty pressure sensor, low transmission fluid, wiring issues. |
| P0843 | Transmission Fluid Pressure Sensor/Switch A Circuit High | Faulty pressure sensor, wiring issues. |
| P0845 | Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance | Faulty pressure sensor, low transmission fluid, wiring issues. |
| P0846 | Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance | Faulty pressure sensor, low transmission fluid, wiring issues. |
| P0847 | Transmission Fluid Pressure Sensor/Switch B Circuit Low | Faulty pressure sensor, low transmission fluid, wiring issues. |
| P0848 | Transmission Fluid Pressure Sensor/Switch B Circuit High | Faulty pressure sensor, wiring issues. |
| P0868 | Transmission Fluid Pressure Low | Low transmission fluid, faulty pressure sensor, internal transmission damage. |
| P0869 | Transmission Fluid Pressure High | Faulty pressure sensor, internal transmission damage, blocked transmission filter. |
| P0960 | Pressure Control Solenoid A Control Circuit Range/Performance | Faulty pressure control solenoid, wiring issues. |
| P0961 | Pressure Control Solenoid A Control Circuit Low | Faulty pressure control solenoid, wiring issues. |
| P0962 | Pressure Control Solenoid A Control Circuit High | Faulty pressure control solenoid, wiring issues. |
| P0963 | Pressure Control Solenoid A Control Circuit Open | Faulty pressure control solenoid, wiring issues. |
| P0964 | Pressure Control Solenoid B Control Circuit Range/Performance | Faulty pressure control solenoid, wiring issues. |
| P0965 | Pressure Control Solenoid B Control Circuit Low | Faulty pressure control solenoid, wiring issues. |
| P0966 | Pressure Control Solenoid B Control Circuit High | Faulty pressure control solenoid, wiring issues. |
| P0967 | Pressure Control Solenoid B Control Circuit Open | Faulty pressure control solenoid, wiring issues. |
| P0968 | Pressure Control Solenoid C Control Circuit Range/Performance | Faulty pressure control solenoid, wiring issues. |
| P0969 | Pressure Control Solenoid C Control Circuit Low | Faulty pressure control solenoid, wiring issues. |
| P0970 | Pressure Control Solenoid C Control Circuit High | Faulty pressure control solenoid, wiring issues. |
| P0971 | Pressure Control Solenoid C Control Circuit Open | Faulty pressure control solenoid, wiring issues. |
| P1111 | Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage | Faulty IAT sensor, wiring issues, loose connections. |
| P1112 | Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage | Faulty IAT sensor, wiring issues, loose connections. |
| P1120 | Throttle Position (TP) Sensor Circuit Malfunction | Faulty TP sensor, wiring issues, throttle body problems. |
| P1121 | Throttle Position (TP) Sensor Circuit Intermittent | Faulty TP sensor, wiring issues, throttle body problems. |
| P1122 | Throttle Position (TP) Sensor Circuit Low Input | Faulty TP sensor, wiring issues, throttle body problems. |
| P1123 | Throttle Position (TP) Sensor Circuit High Input | Faulty TP sensor, wiring issues, throttle body problems. |
| P1124 | Throttle Position (TP) Sensor Out of Range | Faulty TP sensor, wiring issues, throttle body problems. |
| P1125 | Throttle Control System Malfunction | Faulty throttle control motor, wiring issues, PCM problems. |
| P1126 | Throttle Control System Relay Circuit Malfunction | Faulty throttle control relay, wiring issues, PCM problems. |
| P1127 | Heated Oxygen Sensor Circuit Insufficient Switching Bank 1 Sensor 1 | Faulty O2 sensor, exhaust leaks, wiring issues. |
| P1128 | Heated Oxygen Sensor Circuit Insufficient Switching Bank 1 Sensor 2 | Faulty O2 sensor, exhaust leaks, wiring issues. |
| P1129 | Heated Oxygen Sensor Circuit Insufficient Switching Bank 2 Sensor 1 | Faulty O2 sensor, exhaust leaks, wiring issues. |
| P1130 | Heated Oxygen Sensor Circuit Insufficient Switching Bank 2 Sensor 2 | Faulty O2 sensor, exhaust leaks, wiring issues. |
| P1131 | Lack of HO2S Switch – Sensor Indicates Lean – Bank No. 1 Sensor No. 1 | Faulty O2 sensor, vacuum leaks, low fuel pressure. |
| P1132 | Lack of HO2S Switch – Sensor Indicates Rich – Bank No. 1 Sensor No. 1 | Faulty O2 sensor, high fuel pressure, leaky injectors. |
| P1133 | Heated Oxygen Sensor Insufficient Activity Bank 1 Sensor 1 | Faulty O2 sensor, wiring issues. |
| P1134 | Heated Oxygen Sensor Rich to Lean Delay Bank 1 Sensor 1 | Faulty O2 sensor, exhaust leaks, vacuum leaks. |
| P1135 | Heated Oxygen Sensor Rich to Lean Delay Bank 2 Sensor 1 | Faulty O2 sensor, exhaust leaks, vacuum leaks. |
| P1136 | Fuel Trim Additive Air Bank 1 System Too Lean | Vacuum leaks, faulty mass airflow sensor, low fuel pressure. |
| P1137 | Fuel Trim Additive Air Bank 1 System Too Rich | Leaky injectors, high fuel pressure, faulty O2 sensor. |
| P1138 | Fuel Trim Additive Air Bank 2 System Too Lean | Vacuum leaks, faulty mass airflow sensor, low fuel pressure. |
| P1139 | Fuel Trim Additive Air Bank 2 System Too Rich | Leaky injectors, high fuel pressure, faulty O2 sensor. |
| P1150 | Lack of HO2S Switch – Sensor Indicates Lean – Bank No. 2 Sensor No. 1 | Faulty O2 sensor, vacuum leaks, low fuel pressure. |
| P1151 | Lack of HO2S Switch – Sensor Indicates Rich – Bank No. 2 Sensor No. 1 | Faulty O2 sensor, high fuel pressure, leaky injectors. |
| P1152 | Heated Oxygen Sensor Insufficient Activity Bank 2 Sensor 1 | Faulty O2 sensor, wiring issues. |
| P1153 | Heated Oxygen Sensor Rich to Lean Delay Bank 1 Sensor 2 | Faulty O2 sensor, exhaust leaks, vacuum leaks. |
| P1154 | Heated Oxygen Sensor Rich to Lean Delay Bank 2 Sensor 2 | Faulty O2 sensor, exhaust leaks, vacuum leaks. |
| P1166 | Fuel Rail Pressure – Too Low | Faulty fuel pump, clogged fuel filter, fuel pressure regulator issues. |
| P1167 | Fuel Rail Pressure – Too High | Faulty fuel pressure regulator, leaky injectors. |
| P1186 | Heated Oxygen Sensor Circuit Open Bank 1 Sensor 1 | Faulty O2 sensor, wiring issues. |
| P1187 | Heated Oxygen Sensor Circuit Open Bank 2 Sensor 1 | Faulty O2 sensor, wiring issues. |
| P1200 | Injector Control Circuit Malfunction | Faulty fuel injectors, wiring issues, PCM problems. |
| P1201 | Injector Control Circuit Open – Cylinder 1 | Faulty fuel injector, wiring issues. |
| P1202 | Injector Control Circuit Open – Cylinder 2 | Faulty fuel injector, wiring issues. |
| P1203 | Injector Control Circuit Open – Cylinder 3 | Faulty fuel injector, wiring issues. |
| P1204 | Injector Control Circuit Open – Cylinder 4 | Faulty fuel injector, wiring issues. |
| P1205 | Injector Control Circuit Open – Cylinder 5 | Faulty fuel injector, wiring issues. |
| P1206 | Injector Control Circuit Open – Cylinder 6 | Faulty fuel injector, wiring issues. |
| P1207 | Injector Control Circuit Open – Cylinder 7 | Faulty fuel injector, wiring issues. |
| P1208 | Injector Control Circuit Open – Cylinder 8 | Faulty fuel injector, wiring issues. |
| P1209 | Injector Control Circuit Open – Cylinder 9 | Faulty fuel injector, wiring issues. |
| P1210 | Injector Control Circuit Open – Cylinder 10 | Faulty fuel injector, wiring issues. |
| P1211 | Injector Control Circuit Open – Cylinder 11 | Faulty fuel injector, wiring issues. |
| P1212 | Injector Control Circuit Open – Cylinder 12 | Faulty fuel injector, wiring issues. |
| P1230 | Fuel Pump Relay Malfunction | Faulty fuel pump relay, wiring issues. |
| P1300 | Random Misfire (Catalyst Damage) | Worn spark plugs, faulty ignition coils, vacuum leaks, low fuel pressure. |
| P1301 | Cylinder 1 Misfire (Catalyst Damage) | Worn spark plugs, faulty ignition coil, fuel injector problems. |
| P1302 | Cylinder 2 Misfire (Catalyst Damage) | Worn spark plugs, faulty ignition coil, fuel injector problems. |
| P1303 | Cylinder 3 Misfire (Catalyst Damage) | Worn spark plugs, faulty ignition coil, fuel injector problems. |
| P1304 | Cylinder 4 Misfire (Catalyst Damage) | Worn spark plugs, faulty ignition coil, fuel injector problems. |
| P1400 | Differential Pressure Feedback EGR Circuit Low Input | Faulty EGR pressure sensor, vacuum leaks. |
| P1401 | Differential Pressure Feedback EGR Circuit High Input | Faulty EGR pressure sensor, vacuum leaks. |
| P1402 | EGR Valve Lift Sensor Circuit Malfunction | Faulty EGR valve lift sensor, wiring issues. |
| P1403 | EGR Solenoid Circuit Malfunction | Faulty EGR solenoid, vacuum leaks. |
| P1404 | EGR Closed Position Performance | Carbon buildup in EGR valve, vacuum leaks. |
| P1405 | EGR Hose Off or Plugged | Blocked EGR passages, vacuum leaks. |
| P1406 | EGR Valve Pintle Position Sensor Circuit Malfunction | Faulty EGR valve pintle position sensor, wiring issues. |
| P1407 | EGR No Flow Detected | Blocked EGR passages, faulty EGR valve, vacuum leaks. |
| P1408 | EGR Test Not Successful | Faulty EGR system, vacuum leaks. |
| P1409 | EVAP Purge Solenoid Circuit Malfunction | Faulty purge solenoid, vacuum leaks. |
| P1410 | Secondary Air Injection System Fault | Faulty air pump, defective check valve, clogged air passages. |
| P1411 | Secondary Air Injection System Incorrect Flow Bank 1 | Faulty air pump, defective check valve, clogged air passages. |
| P1412 | Secondary Air Injection System Incorrect Flow Bank 2 | Faulty air pump, defective check valve, clogged air passages. |
| P1413 | Secondary Air Injection System Monitor Circuit Low Input | Faulty air pump, defective check valve, clogged air passages. |
| P1414 | Secondary Air Injection System Monitor Circuit High Input | Faulty air pump, defective check valve, clogged air passages. |
| P1415 | Secondary Air Injection System Switch Valve Malfunction Bank 1 | Faulty switch valve, clogged air passages. |
| P1416 | Secondary Air Injection System Switch Valve Malfunction Bank 2 | Faulty switch valve, clogged air passages. |
| P1417 | Secondary Air Injection System Relay Circuit Malfunction | Faulty relay, clogged air passages. |
| P1418 | Secondary Air Injection System Pump Relay Circuit Malfunction | Faulty relay, clogged air passages. |
| P1419 | Catalyst Monitor Bank 1 Incomplete | Faulty catalytic converter, exhaust leaks. |
| P1420 | Catalyst Monitor Bank 2 Incomplete | Faulty catalytic converter, exhaust leaks. |
| P1421 | Catalyst Monitor System Efficiency Below Threshold Bank 1 | Faulty catalytic converter, exhaust leaks. |
| P1422 | Catalyst Monitor System Efficiency |
