johannesmeyer1
Mercedes X Klasse diesel engine issue
Summary of the thread
A 2018 Mercedes X Klasse with a diesel engine is experiencing issues such as a check engine light, loss of power, and increased fuel consumption. The problem is identified as a faulty exhaust temperature sensor. A potential cause could be an exhaust system leak, which can interfere with sensor readings. The solution involved taking the vehicle to a workshop, where a small leak near the sensor was repaired, and the sensor was replaced, resolving the issue.
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4 comment(s)
johannesmeyer1 (community.author)
Exhaust system leaks? Where should I look for those? Can I check it myself, or should I take it to a workshop?
oliverjung5
It can be hard to find them without the right tools. Listen for hissing sounds when the engine is running. You might see soot buildup around the leak. If you're not comfortable going under the car, I'd take it to a workshop. It could save you trouble, especially with the temperature sensor. They can also diagnose if the leak is causing the problem, or if the sensor itself is bad.
johannesmeyer1 (community.author)
Thanks for the tip! I took it to a workshop, and you were right. There was a small exhaust system leak near the temperature sensor. They replaced the sensor and fixed the leak. It cost me 265€, but it's running well now. I appreciate the help!
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MERCEDES
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XKLASSE
oliverjung5
That sounds familiar. I had something similar happen with my Mercedes. It wasn't an X Klasse, but the heat sensor went bad, and the symptoms were almost the same. Have you checked for any exhaust system leaks? That can sometimes interfere with the readings from the emission control system.