2001 Jeep Cherokee OBD2 Codes PO136, PO130, PO138, PO751, PO455, PO740 - Troubleshooting Guide
I own a 2001 Jeep Cherokee with the check engine light on for an extended period. Using an OBD2 scanner, I've retrieved six distinct fault codes: 1) PO136 – Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) 2) PO130 – Misfire Detected (Cylinder 1) 3) PO138 – Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) 4) PO751 – Transmission Shift Solenoid A Performance or Stuck Off 5) PO455 – Evaporative Emission System Leak Detected (Large Leak) 6) PO740 – Transmission Fluid Pressure Control Circuit Malfunction I've already replaced all oxygen sensors and verified the wiring is intact. Despite these efforts, the check engine light remains on. I'm seeking advice on how to diagnose and resolve these issues systematically. Note: The vehicle is a 2001 Jeep Cherokee (not Grand Cherokee), equipped with an older 4-cylinder or 4.0L V6 engine depending on trim. I used a standard OBD2 scanner, not the 'key dance trick'. These codes point to multiple systems—oxygen sensor performance, misfire issues, and transmission/evaporative system faults. Specific resources include: - https://www.obd-codes.com/p0130 - https://www.obd-codes.com/p0136 - https-\www.obd-codes.com/p0138 - https://www.obd-codes.com/p0455 - https://www.obd-codes.com/p0740 - https://www.obd-codes.com/p0751
This is a 2001 Jeep Cherokee XJ, not a Grand Cherokee. Clarifying the engine type (e.g., 4.0L 4-cylinder or V6) would be helpful. The codes indicate multiple system issues: - PO130 and PO136/PO138 are related to oxygen sensor heater circuits and misfires, which may point to fuel delivery, ignition, or ECU calibration problems. - PO455 suggests a significant evaporative emission leak—common in older vehicles with faulty charcoal canister or hoses. - PO751 and PO740 relate to transmission shift solenoid performance and fluid pressure; these could indicate transmission issues requiring inspection or service. Ensure you're using a reliable OBD2 scanner. The 'key dance trick' is not recommended for accurate diagnostics. For deeper troubleshooting, refer to: - https://www.obd-codes.com/p0130 - https://www.obd-codes.com/p0136 - https://www.obd-codes.com/p0138 - https://www.obd-codes.com/p0455 - https://www.obd-codes.com/p0740 - https://www.obd-codes.com/p0751