Service Engine Soon - Exhaust leak?
So my SES light came on a day after I got one of my tires replaced (was really worn out) as my girlfriend was driving the car, so I took it in to get it scanned. I forgot exactly what the guy said it was but he said it was a common problem with cadillacs and this engine in particular, some kind of general code 404 exhaust leak. It doesn't seem to be affecting anything for now since I'm still pulling a consistent 6.5-6.7 second 0-60 on street tires on my g-timer, and the car doesn't seem to be running any worse or getting any different gas mileage. However, the damned light is on and its irritating.
The guy who scanned it for me said it could be leaking just about anywhere and that I'd be better off taking it in to get it fixed. Problem is, I'm not sure if my warranty will cover it, and I'd rather not take the chance if I have to fork out a couple hundred dollars on my own, especially since I've had nothing but problems with this car since I bought it (blown coilpack assembly, broken temp gauge on gauge cluster, trunk leak, fog light wiring harness, steering shaft). If this keeps up, this will be quite possibly the most unreliable car I'll have used. It would appear that my tie rods are also worn out, which will cost me parts and alignment. I know its a premium vehicle, but this is a bit much in just 3 months.
Does anyone have any ideas as to how I might be able to check where this leak is occurring? Is this a common problem with a certain component?
2005 Pontiac Bonneville GXP - For Sale ----- 1995 Buick Regal GS(X) - L67 madness
2000 Buick Regal GSE - Stock...for now
----- 1987 Jaguar XJ-* V12 - 12>8