View Full Version : precat failure or bad o2 sensor? help

06-12-2007, 08:05 AM
i have the yellow check engine lamp glowing and checked out the problem with vag.com.
the resault was , - precat low function -sporadical problem.

does that mean that my o2 sensor is bad or the precat itself is out.

please give me a hint.

A8. 4,2 year 2002

06-12-2007, 02:06 PM
most likely just the o2 sensor