josephtaylor73
Peugeot 408 uneven idling
Summary of the thread
A 2019 Peugeot 408 is experiencing uneven idling, and a diagnostic check indicated an error related to the engine mount. The issue might be due to a defective engine mount or possibly a problem with cable or plug connections. Another person with a similar problem suggested checking the transmission mount, as issues there can mimic engine mount symptoms. The recommended course of action is to have a workshop inspect both the engine and transmission mounts, along with the cable and plug connections, to identify and resolve the problem.
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4 comment(s)
josephtaylor73 (community.author)
Thanks for the response. That's a good point about the transmission mount. I haven't specifically checked it. Could you elaborate on how the transmission mount issue presented itself in your case? Was it also accompanied by a stored error, or were there any other noticeable symptoms besides the uneven idling?
theomystic3
Yes, the error code was the same. To be honest, I am not 100% sure, but my mechanic said that the rubber mount was cracked. You should probably get it checked in a workshop.
josephtaylor73 (community.author)
I appreciate the advice! I will take it to a workshop for a thorough inspection, specifically focusing on both the engine and transmission mounts, as well as the cable and plug connections. Thanks again for sharing your experience; it's been very helpful in guiding my next steps. It will cost me around 95€.
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PEUGEOT
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408
theomystic3
I had a similar issue with my 408. The idling was rough, and the error codes pointed towards the engine mount. Have you checked the transmission mount as well? Sometimes, a failure there can mimic engine mount symptoms. It's worth a look before you start replacing parts.