romyfrank1

Check engine light and stalling at idle

My 2013 Mercedes ML with a gasoline engine is throwing a check engine light and stalling at idle. It's got 76236 km on the clock. I suspect it's the tank ventilation valve acting up. I've read that clogged hoses can cause this, messing with the pressure sensor and emission system. Has anyone else wrestled with this? I even tightened the gas cap thinking it was a simple fix, but no luck!

A 2013 Mercedes ML was experiencing a check engine light and stalling at idle. The suspected cause was a malfunctioning tank ventilation valve, potentially due to clogged hoses affecting the pressure sensor and emission system. After inspecting the hoses and gas cap without finding obvious issues, the problem was confirmed to be the ventilation valve itself. Replacing the valve resolved the issue, clearing the engine light and stopping the stalling.

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4 comment(s)

I had a similar issue with my ML, though I am unsure of the exact year. Same symptoms: engine light and stalling. It could be the ventilation valve hoses like you suspect. A faulty gas cap can also trigger the engine light because it affects the emission system. Have you checked the hoses for any visible cracks or blockages?

Thanks for the quick reply. I visually inspected the hoses, but didn't find anything obvious. By 'blockages' do you mean like, try blowing through them? Also, did your issue cause any problems with your pressure sensor readings? Trying to gather as much info as possible before I start throwing money at this thing.

Yeah, by blockages I mean try to see if air flows through them. Honestly, after checking the cap and hoses, I'd take it to a workshop. It's probably the valve itself if the hoses look okay. Much easier than messing with the emission system on your own.

Appreciate the advice! Turns out you were spot on. Took it to the shop, and it was indeed the tank ventilation valve. They replaced it, cleared the engine light, and the stalling issue is gone. Total cost was 175€, which isn't too bad, I guess. Thanks again for pointing me in the right direction!

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