gertmond1

Mercedes R Klasse Oxygen Sensor Issue

My 2017 Mercedes R Klasse with a diesel engine and 296087 km is having problems. The error memory shows an oxygen sensor error, the check engine light is on, and fuel consumption is up. I think it might be a bad cable or plug. What could be causing this?

A 2017 Mercedes R Klasse with a diesel engine experienced an oxygen sensor error, leading to a check engine light and increased fuel consumption. The initial suspicion was a faulty cable or plug. The issue was resolved by addressing a bad plug connection, which cleared the error and normalized fuel consumption.

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4 comment(s)

I had something similar with my R Klasse, though I don't remember the mileage. Automotive sensor issues can be tough. Did you check the air-fuel ratio? A bad O2 sensor will affect fuel efficiency.

Thanks. How did you figure out the cause, and what was the exact problem with your car? I want to understand the repair.

For me, the check engine light and codes pointed to the O2 sensor, but it was a corroded connector. Check the simple things first before replacing the sensor. If electrical work isn't your thing, a workshop is a good idea.

Thanks for the help. It was a bad plug connection, and the repair was 95€. The error is gone, and fuel consumption is normal again.

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MERCEDES

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RKLASSE