Check engine light on after testpipe install!!!
 

I just installed a testpipe on my 95 GS-R and a new O2 sensor. Now will a tetspipe always set off the engine light or is there something else wrong?? any ideas welcome thanks

It shouldn't give you a CEL on a 95... must be something with the new O2.

it will always set off the check engine light b/c you dont have a cat. it is just your exhaust going straight through w/out being "cleaned" in the cat. you will not pass emissions with this on (if you didn't already know)

OBD1 cars, like the 94-95 integras, have only 1 oxygen sensor, which is placed before the cat. The car doesn't sense what occurs after that in any way.

my fault...i knew that. i wasn't thinking

it has to be the o2 sensor because it wouldn't give you a cel for just a testpipe.

ok I will double check everything thanks