Audi A3 2013 TDI

[Richard1977]

Hello,
My mechanic has been working on my car for two months. He has done forced regenerations, changed the thermostat, cleaned the DPF, etc.

There’s a NOx code showing. He suggested I drive at a constant speed, hoping the code would clear.

I’ve driven for at least two hours on four different occasions at a steady 115 km/h. The only thing that happens is that the DPF light turns on and off, on again and off again, at intervals of 4 to 5 minutes — off for 4–5 minutes, on for 1 minute — continuously for two hours.

According to him, my parameters look fine…

 

[oilhammer]

I don't know what code you have, so I won't attempt a guess other than to say maybe you need a new deNOx catalyst? It happens.

 

[TurboABA]

Sounds like you need another mechanic to me...... or at least pass the crystal ball so we can see everything you're not telling us.... codes, FF data, readiness, vehicle details, maintenance history, etc.