What's causing my Audi A4's emissions problem if not the lambda sensor?

I have an Audi A4 2.0 FSI automatic, registered in September 2004 with 23,500 miles. It went for its annual service and MOT to a local Audi dealer and failed the MOT due to emissions. They said it needed a new lambda probe, which they fitted today. This has not cured the problem and they do not know the answer. Do you have any suggestions please?

Asked on 10 August 2010 by garthmyl

Answered by Honest John

The catalytic converter may have failed.

Tags: mot lambda sensor co2 emissions catalytic converters

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