levischmidt6
XC90 Engine Stalling at Idle
Summary of the thread
A 2021 Volvo XC90 hybrid experienced engine stalling at idle, accompanied by an intermittent check engine light. A diagnostic scan revealed an error code P0172, indicating a rich fuel mixture, possibly due to incorrect fuel. The issue was traced to a defective cable connection related to the fuel composition sensor. Replacing the faulty connection resolved the problem.
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4 comment(s)
levischmidt6 (community.author)
Thanks. The error code is P0172, which says the fuel mixture is too rich. I haven't checked the fuel filter myself. Could a bad cable or plug connection cause a false reading like that?
patriciaschaefer75
P0172 does mean a rich mixture. A bad cable or plug on the fuel composition sensor itself is possible. I'd check the wiring and connections carefully before replacing the sensor. Based on my experience, and given the error code, it might be worth having a qualified technician take a look. It could save you some money. My Mercedes issue turned out to be a faulty sensor connector.
levischmidt6 (community.author)
Thanks a lot. The info about the sensor connector is really helpful. I made an appointment with the workshop for a full inspection. They found a defective cable connection, and after they replaced it, the fault was gone. Total cost 95€.
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VOLVO
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XC90
patriciaschaefer75
I had something similar happen with my old Mercedes-Benz C-Class. The check engine light and stalling at idle match what I saw. The diagnostic pointed to a bad fuel composition sensor. What specific error code is your scanner giving you? Has the fuel filter been checked for contamination?