GLC Hybrid Oxygen Sensor Heater Failure

Interesting. I had a similar issue with my old Volvo XC60, but it was a diesel. Check engine light, higher fuel consumption. It also pointed to the oxygen sensor. I'd double-check the plug connection really well. Sometimes, even if it looks okay, there might be some internal corrosion you can't see. Did you check the voltage at the connector to see if the heater element is getting power? That could narrow down whether it's the sensor itself or something upstream in the wiring.

Thanks for the suggestion. I haven't checked the voltage at the connector yet. That's a good point. Do you know what voltage I should be expecting to see? And where exactly did you measure it on the connector itself? Any advice on how to access the connector easily? I'm trying to rule out a faulty sensor before replacing it, and your advice is helpful. I'm trying to minimize unnecessary expenses by troubleshooting the car components effectively.

Unfortunately, I can't recall the exact voltage. I would strongly advise you to seek out specific values for your Mercedes GLC hybrid; you might find it in a service manual or on a Mercedes forum. As for the connector, I think I measured across the two pins that were specifically for the heater element. Honestly, looking back, while I managed to diagnose the problem, I eventually took my Volvo to the workshop. I would say you should do the same thing.

Understood. I appreciate the insight regarding your previous experience and the recommendation to check the voltage. However, since the cost of a new oxygen sensor is relatively low at 95€, I decided to replace it. That fixed the issue! The check engine light is off, and fuel consumption is back to normal. It must have been a faulty sensor. Thanks for your help!

Hello good day I have a W205 C250 petrol engine 211 hp This error code is displayed for me P0036 HO2S heater control circuit bank 1 sensor 2 open circuit Can someone help me with what this error is? Thank you

(Translated from German)

The error code P0036 indicates an issue with the heater control circuit for the oxygen sensor located on bank 1, sensor 2. This typically means there's an open circuit, which could be due to a faulty oxygen sensor, damaged wiring, or a problem with the connector. Start by checking the wiring and connector for any visible damage or loose connections. If everything looks fine, you might need to test the sensor itself or consider replacing it. Let me know how it goes or if you have any further questions!