Bobber73

Mercedes E-Class Diesel: Persistent Check Engine Light Issue

I own a 2015 Mercedes E-Klasse with a Diesel engine and 187,000 km on the clock. I've been experiencing a persistent check engine light issue. The error code P042815 appears occasionally after resetting. I've already replaced the downstream temperature sensor, which was faulty, but the upstream temperature sensor is showing some resistance readings. How likely is it that both sensors are faulty at the same time, or where should I focus my troubleshooting efforts next?

A 2015 Mercedes E-Class Diesel owner is dealing with a persistent check engine light, linked to error code P042815. After replacing a faulty downstream temperature sensor, the upstream sensor shows unusual resistance readings. It's suggested to inspect the upstream sensor's wiring and connections for damage or corrosion, check for exhaust leaks, and test the sensor with a multimeter to confirm its functionality.

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It's possible for both sensors to fail, but it's less common. Since you've replaced the downstream sensor, focus on inspecting the upstream sensor's wiring and connections for any damage or corrosion. Ensure the sensor is properly connected and check for any exhaust leaks near the sensor that might affect its readings. If everything looks fine, consider testing the sensor with a multimeter to confirm its functionality. Let me know how it goes or if you have further questions!

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MERCEDES

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EKLASSE