Exhaust installed, check engine light on Help!!!

[burton95p]

i installed a pacesetter exhaust on my saturn, its a cat back system and once i installed the check engine light seems to go on when i hit high rpms usually about 5000, i un hook the battery and it resets its fine until i rev the engine high again and it goes on again and stays on for a while. Any ideas??

[TheMU47]

what year is your car?

[burton95p]

96 saturn sl2,

[saturnspeed_12]

might be oxygen sensor. i think shortly after i had my exhaust done, when i got into high rpms, i would throw a code for a slow signal or whatever from the oxygen sensor. bought the universal 1 wire sensor for $18 and problem went away.

[TheMU47]

did you remove or replace the cat?
Is that an old O2 sensor in there now?

[burton95p]

same cat and same o2 sensor did not touch either of them

[MattsBlackIon]

get a new o2 sensor

[Jeremy]

Get the code read.

NObody can tell you what the SES means. I could tell you that you need a new ECTS, but it still doesnt mean anything without knowing the code.

[TBone]

Autozone FTW. They'll read the code for you for free....but an SES light on a Saturn? When it goes OFF is a reason to worry!