I added my downpipe yesterday and I drove my car for over a day. Late tonight I was driving around and suddenly my engine light came on. Anyone have any idea if this could be related to adding the downpipe...also could this be possibly due to something with the o2 sensor?..thanks

It is normal for a check engine light to come on after installation of a downpipe in MkiV Supras.

"There is a difference between a SPORTY car and a SPORTS car."
"Putting a Supra spoiler on your Civic does NOT make it a Supra"

HKS 75mm Cat-back
K&n FIPK
HKS EVC iV
Pending BHG
To undergo 1JZ-GTE conversion

I think only OBDII cars get the check engine light without the rear O2. What year is your car?