About a month ago I took my 2001 GTI to the dealer for the egg smell and check engine light. $430 later they said a spark plug wire had been arching and needed repair.
Over the weekend, got the check engine light and the egg smell again. Took it in this morning. While they are not charging me for the diagnostics, they are charging me $190 to repair a DIFFERENT spark plug wire and $505 to replace the O2 sensor!
First, how could they not check all of the other spark plug wires a month ago? Second, does it make sense that the 02 sensor being bad would cause the problems. From what I've read here, it could be the cat converter?
Advice greately appreciated.