johndragon7
Mercedes V Klasse Oxygen Sensor Issue
Summary of the thread
A 2010 Mercedes V Klasse diesel exhibited a check engine light, with diagnostics indicating an oxygen sensor heater failure, accompanied by increased fuel consumption. The issue could stem from a faulty cable or plug connection to the sensor. A visual inspection of the wiring and connector was suggested, but ultimately, professional diagnosis confirmed a faulty heater element in the oxygen sensor, which was replaced to resolve the issue.
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4 comment(s)
johndragon7 (community.author)
I had a quick look at the cable and plug but didn't see anything obvious, though it's tight in there. What was the problem with your Renault sensor, or what did they find when it was fixed?
hermannmoore1
I didn't dig too deep. I took it straight to a workshop. They confirmed it was the heater element in the o2 sensor, did some sensor testing and swapped it. It's probably best to get it properly diagnosed, especially if the check engine light is still on.
johndragon7 (community.author)
Thanks for the info. I appreciate the suggestion. I took it in, and you were spot on. It was the heater element in the oxygen sensor. They replaced it for 95€. Check engine light is gone and hopefully the fuel consumption will improve. Cheers!
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MERCEDES
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VKLASSE
hermannmoore1
I had a similar issue with my old Renault diesel. The check engine light was annoying. It was also the oxygen sensor. I didn't check the sensor myself, but did you try visually inspecting the wiring and the connector to the exhaust system? Sometimes it's just a loose connection.