Mercedes S Klasse Hybrid NOx Sensor Fault

I had similar issues last year with my S Klasse. Check engine light, NOx sensor fault code, the works. Was the catalytic converter checked? Is yours a diesel?

I don't think they specifically checked the catalytic converter. Yes, it's a diesel.

The NOx sensor issue is likely the cause, especially with those symptoms. It's critical for pollution control. Exhaust leaks complicate things. I'd recommend a workshop visit because a faulty NOx sensor can damage the catalytic converter.

Thanks for the advice. I found some corrosion when inspecting the NOx sensor cable. I'll get the connection cleaned. The cleaning cost 95€.