00 civic si. with 48k miles.. bolt ons include greddy cat, weapon r intake, vis evo hood, agx shocks, chipped ecu.
the engine light came on a month a go and i reset it. i ran the car hard when i was on vacation and a month later the engine light came back on. the oxygen sensors are recommended to be replaced every 50k but they usually last a lot longer then that. i had the mechanic check out the oxygen sensor and said its a little delayed but shouldnt cause the light to go off. we reset the ecu. and its been a week still hasnt come back on... i know it could be the ecu.. but is there anyway to make the car run less rich.. would more airflow help it run less rich.. if i got headers..? i believe someone had turboed this car before i got it. theres wires spliced in some areas and the car had auto start and guages near the cupholder...
my mechanic recommended i change the o2 sensor and if that doesnt help then its the ecu.. can anyone provide me with further helpful info?
thanks

 

change the 02. but it dosnt ake it **** up too bad. Iv been running with a bad secondary 02 sensor since i did my swap (gotta get some more money) and it still runs. but...how many miles were on the car when you got it

 

about 43k when i got it

 

Change o2.

 

What kind of chip do you have? I am not ultra familiar with this ECU chipping stuff, but I would assume if you got one of those ebay chips were you have NO clue what is really on it, that could be your problem, or at least a part of the problem.

 

no chip just vafc tuned by abacus

 

no chip just vafc tuned by abacus