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lukascrystal77

Ioniq check engine light

My 2016 Hyundai Ioniq hybrid with 68451 km has the check engine light on. I suspect it's an air valve issue, maybe a defective hose connection from the pump to the valve. Anyone else seen this?

Summary of the thread

A 2016 Hyundai Ioniq hybrid owner reported a check engine light issue, suspecting an air valve problem or a defective hose connection. Another Ioniq owner shared a similar experience, identifying a vacuum leak in the air intake system due to a cracked hose. The initial owner confirmed the issue was indeed a defective hose, which was repaired at a cost. The conversation highlights the importance of professional diagnosis to prevent potential engine damage.

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4 comment(s)

georgsmith7

I also own an Ioniq, though I'm not sure what year. I had a similar issue with the check engine light. It turned out to be a vacuum leak somewhere in the air intake system. Did you notice any changes in engine performance, like rough idling or stalling? Might be worth checking the manifold pressure too.

lukascrystal77 (community.author)

No stalling, but the idle does seem a bit rough sometimes. Where exactly was the leak on yours? Was it easy to spot?

georgsmith7

Mine was a pain to find. It ended up being a cracked hose near the air pump – very small, almost invisible. Honestly, unless you have a smoke tester, you're probably better off having a workshop take a look. They'll be able to diagnose it properly and won't miss anything. It could be dangerous for the engine if it runs lean.

lukascrystal77 (community.author)

Thanks for the insight. I'll book it in. Turns out it was a defective hose, exactly like you said. Cost me 175€ to fix.

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HYUNDAI

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IONIQ