Fault Codes/Discovery Energy, LLC (Rehlko)/P2177Discovery Energy, LLC (Rehlko)P2177ErrorGeneralWhat This Code MeansSystem Too Lean Off IdlePossible Causes•Problem with the closed-loop feedback controlSuggested Actions1Check for misfires2Check fuel quality3Check fuel pressure regulator and outlet pressure4Check for exhaust leaks5Check for intake manifold leaks6Troubleshoot the HEGO sensor for bad leads. Refer to the Heated Exhaust Gas Oxygen (HEGO) Sensor Troubleshooting section7Replace the HEGO sensor. Refer to the Heated Exhaust Gas Oxygen Sensor (HEGO) sectionRelated Discovery Energy, LLC (Rehlko) Fault CodesP2178P2187P2135P2188P2119P2191P2113P2192P2111P2243P2109P2305Browse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for P2177 on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about P2177GET THE ANSWERFree account required — we'll bring your question with you.