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Oxygen Sensor Heater Failure on Mercedes E Klasse

My 2006 Mercedes E Klasse with a gasoline engine is showing some odd behavior at 73565 km. The check engine light keeps popping on, and the error memory points to an oxygen sensor heater failure. I've also noticed fuel consumption is up. I'm suspecting it's a defective cable or plug connection to the sensor itself. Anyone else run into this? I'm trying to gauge the repair cost, estimated around 95€, before I commit.

A 2006 Mercedes E Klasse is experiencing a check engine light due to an oxygen sensor heater failure, leading to increased fuel consumption. The suspected cause is a defective cable or plug connection to the sensor. It is advised to have the vehicle professionally checked to confirm the diagnosis and avoid further complications. The issue was resolved by replacing the faulty cable and sensor.

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4 comment(s)

Sounds familiar! I had a similar issue with my Mercedes E Klasse, although I can't remember the exact year. The malfunction indicator lit up, and the diagnostics pointed to the O2 sensor heater element. Have you tried any sensor testing to confirm the diagnosis? It could save you some money if it's just a loose connection, like you suspect.

Thanks for the quick response. No, I haven't done any sensor testing myself. I'm a bit of a novice when it comes to car components. Any recommendations on where to start, or what kind of testing would be most helpful in this situation?

Honestly, if you're not comfortable with sensor testing, and you have the check engine light on, it might be best to get it checked professionally. I tried fiddling with mine, but it ended up being a bigger headache. The cost you mentioned seems reasonable, and it'll ensure the heater element and car components are properly checked.

Appreciate the advice. I think I'll take it to the workshop. The check engine light is annoying, and I don't want to risk messing anything else up. Thanks again for confirming my suspicions and sharing your experience. Turns out the cable was indeed faulty. Replaced the sensor and all is well.

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MERCEDES

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EKLASSE