valentinascholz24
Matrix EVAP System Leak
Summary of the thread
A 2010 Hyundai Matrix was experiencing a check engine light, stalling at idle, and poor fuel efficiency, suspected to be caused by a fuel tank ventilation system leak, likely due to a failing activated charcoal filter. The issue was confirmed to be related to the EVAP system, with the charcoal filter identified as a common problem. After replacing the defective filter, the check engine light was resolved, stalling ceased, and fuel efficiency improved.
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4 comment(s)
valentinascholz24 (community.author)
The check engine light stays on most of the time. I haven't noticed hissing sounds, but I haven't been specifically listening for that. Where exactly IS the pressure sensor located? Is it easy to get to?
larsmiller76
Consistent light points more towards a significant leak. The pressure sensor is usually somewhere along the EVAP line, often near the charcoal canister itself or the fuel tank. Without proper diagnostics like a smoke test, it's tough to pinpoint the exact location. Given the symptoms and your initial suspicion, I’d recommend taking it to a trusted mechanic. They can run a proper diagnostic and confirm if the activated charcoal filter is defective.
valentinascholz24 (community.author)
Thanks! I took it to my local shop, and you nailed it – defective activated charcoal filter! They replaced it, the check engine light is gone, and the stalling is fixed. Cost me about 275€ all in. Fuel efficiency also seems to be improving again!
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HYUNDAI
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MATRIX
larsmiller76
That sounds like a classic EVAP issue. The charcoal filter is a common culprit. The system captures fuel vapors to prevent them from being released. When it fails, it can cause all sorts of problems. Is the check engine light on constantly, or does it come and go? Have you noticed any hissing sounds near the fuel tank or filler neck? A faulty pressure sensor could also be the culprit by sending wrong values and influencing the air flow.