installed off-road h-pipe, expected check engine light?

[z28sseater]

I installed a mac off-road h-pipe, and i expected to have a check engine light on, ive had it on for about 2 weeks no, still no sign of any check engline lights, and also i was thinking about it, if the o2 sensors are before the cats on my old h-pipe, then how would the 02 sensors see any difference without the cats and with the cats?

 

[epracmetcon]

You wont get a check engine light because the O2's are before the cats.

 

[COBRASVT]

The check engine lights that come on for o/r pipes are mainly on 96 and newer cars with ODBii / rear O2s. You shouldn't see anything with yours.

 

[cobra4v]

Originally posted by COBRASVT
The check engine lights that come on for o/r pipes are mainly on 96 and newer cars with ODBii / rear O2s. You shouldn't see anything with yours.

COBRASVT is right. Pre 96 mustangs does not have rear O2 sensors to detect for bad cats.