Peugeot 807 NOx Sensor Failure

A NOx sensor failure on a gasoline engine Peugeot 807? That seems unusual. Are you sure it's not a diesel? What's the exact error code you're getting? It could impact your air-fuel ratio significantly.

Yes, definitely gasoline. The error code is pointing directly to the NOx sensor. Do you think it's really likely to be just the cable, or could the sensor itself be faulty?

While a faulty connection is possible, NOx sensors are known to fail. Given the exhaust leak and the error code, I'd advise getting it checked professionally to avoid further pollution control issues. It needs proper diagnosis.

Thanks for the advice. I had the cable and plug connection checked. It was indeed the issue. Repair cost was 95€. Problem solved!