marcbecker10
Mercedes SLC Diesel Engine Jerking and Hissing
Summary of the thread
A 2020 Mercedes SLC diesel was experiencing engine jerking, a whistling and hissing sound during acceleration, increased fuel consumption, and reduced power, with the engine light on. These symptoms suggested a potential issue with the turbo boost sensor or its connections. After consulting a workshop, the problem was identified as a faulty connector to the boost pressure sensor, which was repaired, resolving the issues.
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4 comment(s)
marcbecker10 (community.author)
How can I definitively rule out other potential causes for the engine light, such as issues within the turbocharger itself, before focusing solely on the boost sensor's connection?
leonieblade2
Ruling out other possibilities without diagnostic equipment can be difficult. Given the mileage and the severity of the symptoms, the most prudent approach would be to have a workshop check the turbo boost pressure and the sensor signal with professional tools. They can also properly inspect the turbocharger itself. Sometimes a visual inspection is not enough. Is it worth risking further damage by trying to diagnose it yourself?
marcbecker10 (community.author)
Thank you for the advice. I followed your suggestion and had a workshop diagnose the issue. It was indeed the boost pressure sensor, traced to a faulty connector. The repair cost was 95€. The vehicle is now running as expected.
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MERCEDES
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SLC
leonieblade2
Those are concerning symptoms. The engine light and power loss definitely point towards a turbo boost issue. Is the air intake system properly sealed, without any visible cracks or loose connections? If the boost sensor is faulty, it can throw off the entire turbocharger system. Could the issue be a simple wiring problem?