my 92 civic vx has the stock d15z1 motor
and for some reason it will only redline at 6500
when it is supposed to redline at 7000
the check engine light is on for the heated o2 sensor
could that make it not redline at 7000?
any suggestions?

 

welcome to the forum. Yes it is possible. the sensor talks to the ecu. change the sensor, it may come back up.

 

well the o2 sensor costs like $700
cause its a 5-wire sensor or LAF sensor
so thats why i havent replaced it
but i am just gonna put in a turbo k20 now
but thanks for the help

 

where did you get the k-20 from, and did you get a good price for it. I'm trying to plan to put a k-20 in the fit after the 100k warranty is up, or if the engine goes first.