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franziska_bauer4

Peugeot 4008 Bypass Valve Error Overheating

Hi. My 2012 Peugeot 4008 diesel is throwing a bypass valve error. Mileage is 70k km. Getting an engine overheating warning, too. I cleared the error memory, but it came back. Any ideas before I start tearing things apart?

Summary of the thread

A 2012 Peugeot 4008 diesel exhibited a bypass valve error and engine overheating warning. The problem persisted despite clearing the error memory. Possible causes included a vacuum system leak or a faulty valve in the exhaust system. Ultimately, a diagnostic check revealed a faulty sensor as the root cause, with the bypass valve error being a symptom rather than the cause. The issue was resolved under warranty at no cost.

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4 comment(s)

sarah_nacht1

The bypass valve error and overheating on your Peugeot 4008, 2012 diesel, suggest a deeper issue. Bypass valve malfunctions are often consequential errors. Could you provide any additional information regarding fuel efficiency or engine stalling prior to the overheating?

franziska_bauer4 (community.author)

Thanks for the quick reply. Fuel efficiency seems normal, and I haven't experienced any engine stalling. What kind of 'deeper issue' are we talking about? Should I be checking the vacuum system or the exhaust?

sarah_nacht1

Given the absence of fuel efficiency decline or stalling, and the error code's reappearance, the issue's root cause may still exist. The error may indicate a leak in the vacuum system or a faulty valve in the exhaust system. With the information provided, a diagnostic check at a workshop is recommended.

franziska_bauer4 (community.author)

Appreciate the advice. Took it to the shop as suggested. Turns out it was a faulty sensor causing a chain reaction. Bypass valve error was a symptom, not the cause. Repair cost: 0€ because it was still in warranty. Thanks again!

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PEUGEOT

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4008