Chk Eng light after 3in cold air intake
 

Ever since installing my 3in cold air intake on my sohc zc thats chipped, and has headers. the check engine light would come on, and would find the code to be the 02 sensor, replaced the sensor, check the continuity at the harness to cpu. Even gone so far to wire up 2 02 sensors together, but still comes on. Reset the ecu by pulling the hazard fuse. Is the intake to big for the motor and its sensing oxygen? BTW: the cpu is from TuneFree.

hmmm sounds more like a wiring problem rather than the intake but that's weird.

check you codes from the ecu. they tell wonders.

i'd recommend trying another ECU first to rule that out...

x2