My service engine soon light is driving me crazy. My car runs great, sounds great but periodically my service light will come on and go off very soon later. I check the codes and have gotten gas cap, vaccum leak, maybe weak fire on spark plug or loose connection etc... The codes have been like this. I put on a Mrev 2 and 5/16 spacer and fixed the problem about the vaccum leak. Im thinking it was the gasket was a lil bent on one of the bolts from a shop installing the 5/16 spacer and when I installed the Mrev 2 I fixed that problem. Anyhow Im wondering is it cuz I need a tune the engine is firing codes cuz the mods I have done w/ out a tune. Mods I have done are Mrev 2, 5/16 spacer, full catback exhaust, and a few other bolt ons. Please assist... im about to take it to a dealer and get a full diagnostic check, but im thinking I changed the air flow w/ the car a lot and the engine is just throwing codes from it. Thanks for the help. My car is at 85k miles btw.

 

There's a simple solution rather than getting crazy over this warning, drop by any auto parts store that has a reader. They'll check it free and tell you why it's coming on...Gary

 

Pick up an ELM adaptor or something similar and Torque for your phone. It's a must have....

 

^What gary said.
I ended up buying a OBD II code reader on ebay for $15.
It reads and clears codes.
Came in handy when I had to clear the "service engine" light prior to passing smog. Stupid O2 sensor.

 

Ya I have done this numerous times... I stated some of the codes it listed on the first post. Im thinking I have a lot of mods and a lot more air flow so it's just reading codes cuz it doesn't know wtf I did to it LOL. Anyhow I'll probably get a transmission service, maybe new fluid in the rear axle, new rear tires and go get a dyno tune. After I get the code checked first and probably take it to a dealer so they can do a better diagnostic check on it. Thanks guys.