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sarahberger1

Mercedes B Klasse Engine Stalling Issue

My 2021 Mercedes B Klasse hybrid is showing a check engine light. At 289270 km, it's stalling at idle. I suspect a fuel tank ventilation system leak, maybe the EVAP system. Could a defective activated charcoal filter cause this system failure?

Summary of the thread

A 2021 Mercedes B Klasse hybrid was experiencing engine stalling at idle and a check engine light, suspected to be due to a fuel tank ventilation system leak, possibly involving the EVAP system. A defective activated charcoal filter was considered a potential cause. A suggestion was made to check the purge valve, part of the EVAP system, and to conduct a smoke test to confirm the leak. The issue was resolved by replacing the activated charcoal filter, restoring the vehicle's performance.

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4 comment(s)

johannes_fuchs81

I had a similar issue with my B Klasse. Check the purge valve. It's part of the EVAP system and can cause a leak if it fails. That check engine light and stalling definitely sounds familiar. Get it smoke tested to confirm the leak detection. Is there any fuel smell?

sarahberger1 (community.author)

Fuel smell, no. Where is this purge valve located? Can I visually inspect it, or is it buried? I'm not a mechanic, so simple explanations are best.

johannes_fuchs81

It's usually near the engine, but location varies. You might spot cracks or damage, but diagnosis requires tools. Given the symptoms, it's probably a defective charcoal filter. I took mine to a workshop. They confirmed the EVAP system leak with a smoke test.

sarahberger1 (community.author)

Thanks, I took it to a workshop. You were spot on. They did a smoke test, confirmed the leak in the fuel tank ventilation system, and replaced the activated charcoal filter. Cost me 275€. Runs great now. Thanks again!

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MERCEDES

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BKLASSE