wernerfox34
B Klasse rough idle and engine mount error
Summary of the thread
A 2021 Mercedes B Klasse exhibited rough idling, and a diagnostic scan revealed an engine mount error. The potential causes considered were a defective engine mounting bracket, failed rubber or transmission mounts, or a defective cable or plug connection. The issue was resolved by securing a loose connection to the engine mount sensor, which cleared the error code and restored smooth idling.
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4 comment(s)
wernerfox34 (community.author)
Thanks. When you had a similar issue with your B Klasse, did you see error codes related to the mounting bracket, or were there just physical symptoms like excessive vibration?
miamystic4
The error code pointed to a problem with the engine mount signal. The workshop confirmed it was a faulty connection. I'd recommend getting it checked professionally.
wernerfox34 (community.author)
I appreciate you sharing your experience. I took my car to a workshop, and it was a loose connection to the engine mount sensor, like I thought. They secured the connection and cleared the error code. The idling is now smooth. Thanks again for your help.
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MERCEDES
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BKLASSE
miamystic4
Uneven idling and an engine mount error? I've had something similar with my B Klasse. Have you checked the engine mount's physical condition? Sometimes it's visibly cracked or damaged.