So i got chipped today with GIAC. (1999 A4 1.8t). I like it. It may have been slightly less than what i was expecting, but definetly there and I really don't need any more hp than that. I think i notice it most in 3rd gear 3-5k rpm. I really haven't drove too much or too hard with it yet (there's always a car in front of me on the freeway onramps!) So I'm happy with it BUT.......
Tonight (after having driven it 90 miles home from the shop and a couple short trips) I get in and start it to find the check engine light illuminated. [sm=noooo.gif] I really didn't like that. My friend told me that the those light only when the exhaust oxygen sensors sense a problem or are malfuntioning. He downplayed it to the point of saying just take out the fuse to the warning light....hmmm... not really good enough for me. I just got this car and I don't want to f it up. I am going to call the shop, but am afraid they won't be open again till monday. Please advise! shoud i worry about driving it 10 miles home from friends house? is this a (relatively) common occurance with getting chipped?

not happy [sm=smiley35.gif]

As long as the light is solid and not flashing, then you can drive it just fine. A CEL can illuminate for much more than just O2 sensors, your friend is giving terrible advice. Just try to keep off the accelerator till you figure out what it is. If you have an Autozone nearby you can take it to them, and they will scan it for free. Did you replace your diverter valve too?

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2004 VW Touareg
2005.5 Audi A4
1997 Audi A4