Fault Codes/Discovery Energy, LLC (Rehlko)/P1135Discovery Energy, LLC (Rehlko)P1135ErrorSensorsWhat This Code MeansOxygen Sensor 1 Bank 1 Lean ShiftPossible Causes•Diagnostic not set•Problem with exhaust leaks or poor HEGO sensor performanceSuggested Actions1Check for exhaust leaks before or near the HEGO sensor2Check for intake manifold leaks3Verify that the HEGO sensor is installed securely4Troubleshoot the HEGO sensor for bad leads. Refer to the Heated Exhaust Gas Oxygen (HEGO) Sensor Troubleshooting section5Replace the HEGO sensor. Refer to the Heated Exhaust Gas Oxygen Sensor (HEGO) sectionRelated Discovery Energy, LLC (Rehlko) Fault CodesP1136P1138 3217 31P0134P2195P0133P2196P26 - 48P2231P26 - 47P22703217 31P2271Browse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for P1135 on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about P1135GET THE ANSWERFree account required — we'll bring your question with you.