marvinraven79

Peugeot 208 knock sensor issue

I've got a 2017 Peugeot 208 (gasoline engine) and the check engine light keeps popping up. It's done 190729 km. I've noticed higher fuel consumption and the engine idles unevenly. I read online it might be the knock sensor. I checked the sensor itself and it looks fine, but the cable and plug look a bit worn. Could that be it?

A 2017 Peugeot 208 is experiencing a check engine light, higher fuel consumption, and uneven idling, potentially due to a knock sensor issue. The sensor itself appears fine, but the cable and plug seem worn, which could cause these symptoms. Cleaning the contacts is suggested as a first step, but if the problem persists, professional diagnosis is recommended to confirm whether the issue lies with the wiring or the sensor itself. Ultimately, the problem was identified as a defective knock sensor cable, which was resolved at a workshop.

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4 comment(s)

Sounds plausible. A dodgy connection to the knock sensor could definitely cause those symptoms. The ECU relies on that signal to adjust timing, so if it's intermittent, it will throw a code and affect fuel consumption and idle. Have you tried cleaning the contacts on the plug and sensor? Sometimes that's enough to fix it. Also, do you have a code reader to see what specific code is being thrown?

I haven't tried cleaning the contacts yet, good idea! I don't have a code reader myself. If cleaning the contacts doesn't work, is replacing the sensor itself the next logical step, or could it be something else entirely?

While replacing the sensor is an option, given that you suspect the wiring, I'd advise against throwing parts at it without confirming. It really could be the wiring, or even further up the line. The best bet, especially without a code reader, is to get it to a workshop. They can properly diagnose the fault and pinpoint the exact problem. A defective cable or plug connection of the component is very likely.

Okay, thanks for the advice. I'll take it to a workshop to get it checked out properly. Hopefully, it's just the wiring like we suspect. It was indeed the knock sensor cable. Cost me 95€ to get it sorted. Thanks again!

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PEUGEOT

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208