Peugeot 3008 NOx Sensor Faulty Connection

I'm having a nightmare with my 2018 Peugeot 3008 hybrid. The check engine light keeps popping on, and diagnostics show an error in the memory related to the NOx sensor. To top it off, there's a distinct smell of exhaust leaking. I've checked the obvious, but I'm thinking it's a defective cable or plug connection to the sensor. Anyone else had similar issues? It's only done 24471 km, so I'm really hoping it's nothing major.

4 comment(s)

Sounds frustrating. I had a similar issue with my 2016 Volvo XC60 diesel a while back. Same symptoms – check engine light, error codes pointing to the emission sensor. Did you check the sensor's connector? Sometimes they get corroded or loose.

Thanks for the tip! I did have a quick look at the connector, but didn't see anything obvious. Was there a specific part of the connector that caused the problem on your Volvo, or was it just generally corroded?

For me it looked alright at first glance, but the mechanic found a tiny crack in the plastic housing of the connector itself. Moisture got in and messed with the signal. Honestly, after diagnostics and sensor replacement, it cost me about 95€. I would recommend taking it to a shop to get it checked out properly.

Thanks a lot for sharing your experience! Ended up taking it to the shop, and you were spot on - it was indeed a faulty connection on the NOx sensor. They replaced the connector, and the check engine light is gone. Problem solved!

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