C2 NOx Sensor Fault

My 2007 Citroen C2 (gasoline engine) has the check engine light on with a NOx sensor error. I think there's an exhaust leak too, maybe a bad cable or plug. Anyone seen this before?

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I've got a C2 as well. Something similar happened to me. Is the exhaust leaking near the sensor? Did you check the sensor's plug?

Yeah, the exhaust seems to be leaking near the sensor. The plug looked fine when I checked it. How did you fix it?

Mine was leaking where the sensor screws in. Tightening it stopped the leak, but the light stayed on. The sensor was bad and needed to be replaced. If you smell exhaust, a workshop can confirm it quickly.

Took it to a workshop, and they said the NOx sensor was faulty. Repair was 95€. Replaced the sensor, and it's all good now.

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