Grandland X engine stalling and fuel composition error

That's a weird one! Incorrect fuel composition errors can be tricky. Is your fuel economy normal, or have you noticed it's gotten worse? Also, when was the last time you changed your fuel filter? Perhaps fuel isn't getting through as it should, like trying to suck lemonade through a tiny straw!?

My fuel economy seems normal, and I haven't changed the fuel filter recently. But wouldn't a clogged fuel filter affect performance all the time, not just at idle, and trigger other codes? Is it really possible a faulty connection would cause the system to misread the fuel?

Okay, with normal fuel economy, and given the error code and your engine stalling only at idle, a defective cable or plug connection is a strong suspect. The computer 'thinks' there's a fuel issue because the sensor signal is corrupted. Like a dodgy wire making your TV show the wrong colors! I'd advise getting it checked at a workshop. Don't want it getting worse.

Thanks, I appreciate the insight. I took it to the shop, and you were spot on. It was a corroded connector on the fuel composition sensor. They cleaned it and replaced the connector, and the error is gone. Total cost 95€!