Need help. resonator=check engine
 

HI .I have 02SI i put a exhaust in it with i resonator only, now my checkengine ligth is on. how can i make it go awy, with out a 02 simulator? they r konw to burn the ecu.what else can i do?

Re: Need help. resonator=check engine
 

Give us better details.

I'm guessing this is an 02 Honda Civic SI?

If so, you're most likely not going to be able to change that CAT with an after market resonator.

Your 02 is reading all the wrong gases coming from your engine, because of that resonator.

Do this, take out the resonator, put your factory OEM CAT back in, and be happy.

Otherwise, go take your check engine light, unplug the bulb and quit whining if you're that cheap.

Re: Need help. resonator=check engine
 

the light stays

Re: Need help. resonator=check engine
 

we ------- told you IN THE LAST THREAD YOU MADE

stop making threads to get different answers, cock mongling vag crust

Re: Need help. resonator=check engine
 

yep what they said, secondary O2 sensor isn't liking all the flow and bad gas's being passed through since there is no cat. easy solution would be to either convert it to OBD1 or get an O2 simulator.

Re: Need help. resonator=check engine
 

I don't know if this will work on yours but i did the spark plug saver trick on mine and it never sets the light. In other words i have the sensor hooked up but out of the flow in the pipe. It does stay at higher volts like around .9 ish but my ecu wont set a light for that. All its looking at is a constant voltage and not changing like o21. I am not sure what changed from 2000-2002 ecu readings. If its not CAN it should work, maybe someone else knows :y