Here is the situation with my '96 850 wagon, 5sp:
Check Engine light came on.
Local Volvo mechanic said they read the code and the air pump has gone bad. Said the car is fine to drive, but I would have to replace air pump a few weeks before the emissions test to give the computer time to clear all the codes. They reset the check engine light.
After a few weeks it came on again.
Had the airpump replaced for about $500 (d'oh!) right before long road trip.
During trip (a few days later) the check engine light came on AGAIN!
I'd hate to think I spent that kind of money and the problem isn't fixed! I have noticed that my exhaust pipe seems bigger (has a tip?) and is angled downward more than other 850 wagons around town.
**Any ideas/comments?** If not the air pump, what else could it be? Any chance the mechanic can put my old air pump in and refund some of the $500?