Fault Codes/Discovery Energy, LLC (Rehlko)/3217 5Discovery Energy, LLC (Rehlko)3217 5UnclassifiedGeneralWhat This Code Means3217 5Possible Causes•HEGO heater causing interference with the HEGO signal•Problem with HEGO sensor or leadsSuggested Actions1Troubleshoot the HEGO sensor for bad leads2Replace the HEGO sensorRelated Discovery Energy, LLC (Rehlko) Fault CodesP0006P00071695 18P00311270 6P0032P050CP0068P0102P0103P0107P0108Browse all Discovery Energy, LLC (Rehlko) fault codes→ASK RUDY ABOUT THIS FAULTGet a diagnosis walkthrough for 3217 5 on your specific Discovery Energy, LLC (Rehlko) unit — cited to the OEM manual, not a forum guess.Your question about 3217 5GET THE ANSWERFree account required — we'll bring your question with you.