Picked up a 1999 S80 for my daughter last week. It has 92,000 miles on it. Had it smogged and it passed with flying colors. About 40 miles after the test the P0422 code popped up. Three of the four O2 sensors were replaced about 4 months ago. At first we thought it might be the 4th sensor on Bank 1...

I have a 1993 240 DL that stalls periodicaly. It always happens when it is at idle speed. Starts right up after it stalls. It just passed smog with good numbers. Plugs look good as does rotor and distributor cap. I had a repairman work on the brakes and it stalled on him so he adjusted the idle upwa...