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i recently put on HP Racing headers and cat, as well as a custom 2.5" pipe to megan muffer. Ever since then my check engine light has been on, it went off for about 5 days and came back on yesterda. i recently passed emissions with this stuff on. Any ideas as to why the light has been on, or should i just go hit up a mech and pay the 30 bucks to find out

thanks

 
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sorry mod please move me to vehicle probs thanks

sorry again

 
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take the neg off for about 15mins then put it back on and let the car run for 10mins and see if that works

 
Rep Power: 308

Yeah reset the ECU, then if the light still comes on, You should get the code read for you. I'd bet a nickel it's coming from the sensor after the Cat.

 
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the light went off again this morning im gonna see if the reset works or not this afternoon ill update then

thanks

 
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If you can't get it to stay off try this, http://www.bigjoshracing.com/store/shop/index.html

Check out what Hayz said in his review at the bottom of this page
http://www.7thgencivic.com/parts_rev...7/cat/8/page/1

I bought a mil elim for my 01 lx but haven't put it or the header on yet so I can't say anything from experience.

 
Rep Power: 308

Don't you hate it when you type a long response and hit the reply button, get the white screen saying "Can't find Server" Hit the back button, and all your typing is gone ! *Cheap Dial Up*

Here is the shortened version

don't buy headers

don't buy MIL to code read, find sensor code, then MIL

Nickel Bet Sensor after cat

Have a Nice Day

 
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just go to ebay and buy a bakerelectronics sim chip for $25. mine works fine. mine did that before I put in the sim chip, and now I have no lights....

 
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I installed my header and mil last night and no cel yet.

 
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Get a MIL eliminator from bigjoshracing . . . and reset the ECU.

 
Rep Power: 275

definately unplug the battery so the ecu resets. you can even take out the sensor fuse in the fuse box while your at it.

i have a hi flow cat and have the same problem for months. i read a solution that goes:
1) take keys out of ignition
2) unplug sensor fuse (#15 on my 03 ex auto)
3) put key in ignition to "ACC" stage
4) take keys out
5) plug back in sensor fuse
6) light is gone (well for now it is..lol)