anna_bauer46
Fiat Doblo NOx Sensor Failure
Summary of the thread
A 2023 Fiat Doblo is experiencing a check engine light and NOx sensor failure messages, with a noticeable exhaust smell near the catalytic converter and a suspicious-looking sensor cable. Possible causes include a faulty sensor connection or an exhaust leak exacerbating the sensor issue. Suggested solutions involve inspecting the sensor plug connection for corrosion or looseness and considering professional inspection to address potential leaks and ensure proper diagnosis.
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4 comment(s)
anna_bauer46 (community.author)
Good point about the plug connection; I'll give that a closer look tomorrow. I was using a generic OBD reader. Yours smelled of exhaust too? What did it end up being, and how much did it cost?
emiliafox65
No exhaust smell on mine, thankfully! For the Volvo, it turned out to be a faulty connection. Given you're smelling exhaust too, it might be wise to get it checked out by a professional. Could be a leak making the sensor issue worse. Probably best to bring it to a workshop. It will probably be cheaper than endlessly fiddling around.
anna_bauer46 (community.author)
Thanks for the reality check! I hate admitting defeat, but you're right. I'll book it in for a proper inspection. I checked the plug myself and it all looked fine. The issue ended up being a bad connection, the bill came to 95€ including the inspection. Thanks again for the help!
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FIAT
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DOBLO
emiliafox65
Sounds familiar! I had a similar issue on my 2018 Volvo V60: check engine light, emissions errors. I didn't smell any exhaust, though. Did you look at the plug connection itself? Sometimes they can corrode or get loose. What kind of diagnostic tool are you using to read the error codes?