noahstorm3

Saxo NOx Sensor Failure

My 2003 Citroen Saxo, gasoline engine, at 244505 km is having trouble. The check engine light keeps popping up, and the error memory says NOx sensor failure. I've also noticed a slight exhaust leak. I suspect a defective cable or plug connection. Has anyone else dealt with this before? I'm trying to avoid expensive repairs, but I understand the exhaust system is important.

A 2003 Citroen Saxo with a gasoline engine and 244,505 km is experiencing a persistent check engine light, with diagnostics indicating a NOx sensor failure. The owner suspects a defective cable or plug connection, possibly exacerbated by a slight exhaust leak. After consulting with others who had similar issues, the problem was confirmed to be a faulty NOx sensor connection, which was resolved by a mechanic, eliminating the check engine light.

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4 comment(s)

Hey, I had something similar with my Saxo. Check Engine light and all that. Didn't notice an exhaust leak though. Was it hard to diagnose?

What was the ultimate cause of your check engine light? Was it indeed related to the emission sensor, and did you also suspect the air-fuel ratio? I'm curious if the sensor cable was defective.

Yeah, it was the NOx sensor in my case. I couldn't figure out the cable issue myself. I ended up taking it to a workshop; they sorted it out pretty quickly.

Took your advice and went to a mechanic. Turns out, it was indeed a faulty NOx sensor connection as suspected! They fixed the cable, and the light is gone. Total cost: 95€ Thanks a lot for the help!

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CITROEN

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SAXO