GLA CEL and Stalling at Idle Fuel Tank Ventilation Issue

My 2019 Mercedes GLA with a gasoline engine is throwing a CEL and stalling at idle I've pulled the codes and it seems to point towards a fuel tank ventilation system leak Mileage is currently sitting at 123616 km I've been doing some digging and suspect it might be a defective activated charcoal filter I've checked the fuel cap, and that seems fine Could a faulty pressure sensor also cause this Or perhaps a leak detection pump issue The diagnostic tool mentions something about system failure and incorrect air flow I've also read about the purge valve sticking Any ideas before I start throwing parts at it

4 comment(s)

I had a similar issue with my GLA Check the purge valve first, it's a common problem If it's not that, it could be the charcoal canister The pressure sensor can also trigger the CEL, but usually that's a secondary effect of the leak

Thanks for the quick reply When you say 'similar issue', did you also experience the stalling at idle And was your check engine light also related to the fuel tank ventilation Any chance you remember the specific code you were getting Trying to avoid the stealership if I can

Yep, stalling at idle was exactly what I had Check engine light was on because of a leak in the fuel tank ventilation I don't recall the exact code, but I remember it was related to the evap system Honestly, after messing with it for a while, I just took it to a shop Saved myself a lot of hassle

Appreciate the input Sounds like I'm heading down the same road I'll try to check the purge valve, but probably will end up at a workshop Got a quote for 275€, including parts and labor to replace the charcoal filter Seems reasonable enough Thanks again

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