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luisamoon5

Peugeot 408 hybrid engine stalling

I've got a 2023 Peugeot 408 hybrid with a weird issue. The check engine light keeps popping up, and the engine sometimes stalls when I'm idling. I've also noticed a drop in power. I suspect it's a faulty rail pressure sensor, anyone else had this?

Summary of the thread

A 2023 Peugeot 408 hybrid was experiencing engine stalling, a check engine light, and a drop in power. The initial suspicion was a faulty rail pressure sensor, supported by an error code indicating a sensor signal issue. While other potential causes like a clogged fuel filter or failing fuel pump were considered, the problem was resolved by replacing the faulty rail pressure sensor, restoring the vehicle's performance.

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4 comment(s)

lenatiger69

Sounds like a potential fuel pressure issue. When the engine stalls, does it happen more often when the fuel tank is low? Also, have you scanned the car for error codes? That would give you a better idea if the rail pressure sensor is indeed the problem. Sometimes, a clogged fuel filter can cause similar symptoms by starving the engine of fuel, and a failing fuel pump can also cause the same symptoms.

luisamoon5 (community.author)

Thanks for the tips! No, the fuel level doesn't seem to make a difference, and yes I did scan it - it threw a code indicating a problem with the rail pressure sensor signal. A clogged fuel filter isn't out of the question, but I wanted to start with the sensor first. Where exactly is the fuel filter located in the 408 hybrid?

lenatiger69

Okay, the error code makes it pretty clear. While it could be a wiring fault, if the code specifically mentions the sensor signal being faulty, it probably is a defective sensor. To be honest, I'm not 100% sure where the fuel filter is located on your specific model, and it can sometimes be integrated with the fuel pump, inside the fuel tank. Given the symptoms and the error code, I'd recommend taking it to a trusted mechanic for diagnosis and repair. Replacing the sensor yourself might not solve the problem if there is something else at play.

luisamoon5 (community.author)

You're right, I think I'll take it in. Turns out it was indeed a faulty rail pressure sensor. The shop replaced it for 240€ and now it runs like new again. Thanks for the help!

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PEUGEOT

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408