robertweiss1
Mercedes V Klasse Air Valve Issue
Summary of the thread
A 2021 Mercedes V Klasse with 108,563 km developed a check engine light issue, suspected to be related to an air valve problem. The owner identified a potential cause as a faulty hose connection from the pump to the valve, leading to a vacuum leak and idle problems. After consulting with others and visiting a workshop, the defective hose was confirmed and replaced, resolving the issue and eliminating the check engine light.
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4 comment(s)
robertweiss1 (community.author)
Rough idle sometimes, yeah. Where exactly did you find the vacuum leak on yours? Was it obvious, or did you need to hunt around for it? And did it also trigger the check engine light immediately, or did it take a while?
benjaminwagner26
Mine also caused idle problems. I didn't pinpoint the exact spot myself, honestly. I just took it in. If you're not confident, might be worth getting a mechanic to check it out, especially if it's intermittent. Could save you a headache.
robertweiss1 (community.author)
Thanks for the advice! Took your suggestion and went to a workshop. Turns out it was indeed a defective hose connection from the pump to the valve, causing a vacuum leak. Replaced it, and the check engine light is gone! Cost me 175€, but at least it's sorted.
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MERCEDES
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VKLASSE
benjaminwagner26
Air valve issue on a V Klasse? Check those vacuum hoses carefully. I had similar check engine light drama. Is the engine idling rough? Could be a vacuum leak like you suspect. I'd check all connections before assuming the worst.