i check with vag com no fault about that nothing , when i go in engine and readiness there are is the sensors ,cat ,etc. last time when the light it was on i check and all show passed ,once i clear fault(always is coming up with the coolant temp sensor apparently common fault) i go again itno engine and readiness and surprise heating sensor , one more plus the cat say failed or incomplete.
now i start to think maybe a coil pack is playing games sometime. they have done 60k and they are prone to fail.
cheers