Help! Rotten egg exhaust![850][1995]  Liz -- Thursday, 5 April 2001, at 7:42 p.m.

 Here's the story....
 About 2 weeks ago, my engine cooling warning light came on. I looked under the hood, and my coolant resevoir was almost empty. I noticed that the cap
 was completely cracked so I replaced it and refilled the resevoir w/ fluid. The Volvo dealer said it was the obvious cause of the coolant loss and it should be
 fine. The engine never overheated...I noticed the temperature gauge remained normal. The light never came back on over the past two weeks. Today,
 however, I was driving home and the check engine light came on. All gauges looked fine, but I noticed an awful rotten egg smell coming from the exhaust (so
 did everyone outside!). When I got home, it stunk the whole garage up. The check engine light stayed on. I let it sit for about an hour and restarted
 it....same thing.
 Is this a cooling problem still?
 Should it not be driven at this point?
 Any other ideas?
 If you can diagnosis the problem, is this an expensive repair??
 (which ones aren't....:) )
 Your help would be GREATLY appreciated!
 Thanks....
 --
 Liz

 P.S.
 It is a Turbo.

 Rotten egg smell is usually a telltale sign of a catalytic converter going bad. And if that is the case that can also explain why the "check engine" light went
 off... Definitely have the cat checked out.

 Yannis
 --
 '01 V70 T5 M, Classic Red/Graph L, Sunroof, Rear Spoiler, Cold Weather, 4CD Surr.Sound, 17" "Tethys" Alloys...950 miles averaging 25.8 mpg mixd
 driving

 Thanks for your reply Yannis.
 The check engine light DID NOT go off though...still on. Could this be something different?
 Liz
 --
 Liz
                  

 I am sorry Liz, I meant that it was "ON"...A bad catalytic converter would most likely light up the "check engine" light...

 Yannis
 --
 '01 C70 T5 M, Classic Red/Graph L, Sunroof, Cold Weather, 4 CD Surr. Sound, Rear Spoiler, 17" "Tethys" Alloys

 Try a different brand of gas, as some have a higher sulfer content than others.
 --
 Marc 855T

 Probably one of your Oxygen sensors is bad or just fouled. I had to replace the one in my '94 850T last year. 850's have 2 oxygen sensors and I believe the
 one in the front is the one that typically needs to be replaced. My friend has a '96 850 GLT wagon that is in a similar situation. Rotten egg smell and engine
 check light is on. Dealer reported that the engine code indicated a bad O2 sensor.

 I did the work myself and O2 sensor was around $160 from Swedish Engineering. With dealer mark-up and labor you can expect to dish out several
 hundred dollars.

 Alternatively, you could try using a powerful fuel system cleaner like Valvoline Synthetic engine treatment or a large bottle of Chevron Techron. It might even
 fix your O2 sensor problem. Anyways, for $10 it's worth a shot.

 -Good luck
 --
 '94 854T - iPd ECU & sway bars, Bilsteins, Crane LX-91 coil, Volvo strut tower brace