Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSJEEP2011COMPASS LIMITED, FWD, AUTOMATIC CVTREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 30 (2.0L & 2.4L - DTCS P000A TO P0302 - MK)DTC TROUBLESHOOTINGP0131 - O2 SENSOR 1/1 CIRCUIT LOWDIAGNOSTIC TEST

2011 Jeep Compass Limited, FWD, Automatic CVT

Diagnostic Test

2011 Jeep Compass Limited, FWD, Automatic CVTSECTION Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Patriot and 2017 Jeep Compass. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY O2 SENSOR OPERATION
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
3. With the scan tool, select and graph the O2 Sensor suspected of not performing correctly.
4. Review the 3 sample videos of O2 Sensor operation to determine which graph best matches what is displayed on the scan tool for the vehicle.
5. Which video best matches the graph displayed on the scan tool?
  Video 1 (Normal operation)
  
  multimedia:A supplement to the article is available.
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
  Video 2 (Rich operation)
  
  multimedia:A supplement to the article is available.
  - Go To 2
  Video 3 (Lean operation)
  
  multimedia:A supplement to the article is available.
  - Go To 3
TESTING FOR RICH O2 SENSOR OPERATION
1. Start the engine.
2. With the scan tool, select and graph the O2 Sensor suspected of not performing correctly.
3. Disconnect engine vacuum lines to create a lean running condition.
4. With the engine vacuum lines disconnected monitor the O2 Sensor graph on the scan tool.
  Did the O2 Sensor graph show a change from rich to lean?
  
  Yes
  - Check for any of the following conditions/mechanical problems that can cause a O2 Sensor stuck rich condition:
  - AFTERMARKET equipment or software effecting emissions.
  - AIR INDUCTION SYSTEM - must be free from blockage.
  - ENGINE VALVE TIMING - must be within specifications.
  - ENGINE COMPRESSION - must be within specifications.
  - ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
  - ENGINE PCV SYSTEM - must flow freely.
  - FUEL - must be free of contamination.
  - FUEL PRESSURE ABOVE SPEC - faulty regulator.
  - FUEL INJECTOR - plugged, stuck open or restricted injector.
  No
  - Replace the Oxygen Sensor in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST
TESTING FOR LEAN O2 SENSOR OPERATION
1. Start the engine.
2. With the scan tool, select and graph the O2 Sensor suspected of not performing correctly.
3. Create a rich running condition.
4. With the rich running condition, monitor the O2 Sensor graph on the scan tool.
  Did the O2 Sensor graph show a change from lean to rich?
  
  Yes
  - Check for any of the following conditions/mechanical problems that can cause a O2 Sensor stuck lean condition:
  - AFTERMARKET equipment or software effecting emissions.
  - AIR INDUCTION SYSTEM - must be free from leaks.
  - ENGINE VACUUM LEAK- must be at least 13 inches in neutral.
  - ENGINE VALVE TIMING - must be within specifications.
  - ENGINE COMPRESSION - must be within specifications.
  - ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
  - ENGINE PCV SYSTEM - must be free of leaks and flow freely.
  - POWER BRAKE BOOSTER - no internal vacuum leaks.
  - FUEL - must be free of contamination.
  - FUEL PRESSURE BELOW SPEC - restriction in system or faulty pump.
  - FUEL INJECTOR - plugged or restricted injector.
  No
  - Replace the Oxygen Sensor in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.