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Mercedes CLA Diesel Engine Issues

My 2016 Mercedes CLA diesel is acting up Check engine light is on, power is low, engine response is awful, and it sometimes stalls at idle Fuel consumption is also way up I hear a whistling noise and a loud hissing when I accelerate I checked the intercooler hoses and they seem fine Could it be the throttle body or the MAP sensor

A 2016 Mercedes CLA diesel exhibited issues such as a check engine light, low power, poor engine response, stalling at idle, increased fuel consumption, and unusual noises during acceleration. Initial checks on the intercooler hoses showed no issues, leading to speculation about the throttle body or MAP sensor. However, further investigation suggested a problem with the boost pressure regulation system, specifically the wastegate valve. A professional diagnostic confirmed the wastegate valve issue, which was repaired, resolving the problems.

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4 comment(s)

I understand your concern about your Mercedes CLA Your symptoms point to a problem in the boost pressure regulation system I had a similar issue with my old Volvo V70; it was a faulty boost pressure sensor that caused power loss and strange noises Have you checked the vacuum lines for the turbocharger and wastegate A leak there could cause your symptoms

I haven't checked the vacuum lines, but I visually inspected the turbocharger for damage or leaks Where are the vacuum lines located, and how can I test them without special tools

On my Volvo, the vacuum lines ran near the turbocharger and connected to the wastegate actuator Visually check for cracks or disconnections You can try spraying soapy water on the lines while the engine runs, looking for bubbles that indicate a leak However, your symptoms suggest a potentially significant issue A professional diagnostic assessment may be wise before attempting repairs yourself A defective wastegate can damage the turbocharger beyond the 860€ you are worried about

I appreciate the advice I took it to a workshop, and they confirmed it was a problem with the wastegate valve The total repair cost was 860€, but it's fixed now Thanks again for your help

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MERCEDES

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CLA