I'm keep getting CEL light on after installing UTEC.. And as soon as I take em off and connect the harness to the OEM ECU CEL light goes off.. What should I do? The codes are P0300, and P2A03.. Oh and there are two P0300.. Thanks Guys..

 

I'm not a tuner, so I can't offer any specific advice. But I would get somebody with more experience to look at the car/tune as soon as possible.

A P0300 is a Multiple Cylinder Misfire.

I can't find P2A03 in the FSM. A quick google shows that for some Toyota models, a P2A03 indicates a failure in the bank 2 a/f sensor.

This post in another forum may or may not be of interest: http://www.gforceperformance.com/for...9021b538d22f6c

 

Thanks... I knew what those were.. I just cannot figure out what to do to fix them..

 

You can always post at my350z's section on tuning. There are a couple of good guys there. One is a rep for Utec. Check it out. "audiblemayhem" This guy is the man!!!!