P2A00 & P0300 Misfire

Jordo!

That's a slow responding O2 sensor code, bank 1, sensor 1.

It could be:

1. Dirty/Bad MAF sensor or wire issue.

2. Damage to sensor or wire on the primary bank 1 O2 (what the code actually means).

3. Something screwy related to the CAI diameter being different from OEM or possibly not being clamped down well enough (MAF's are VERY sensitive to vibration and airflow tumble effects on this car).

Try swapping or cleaning the MAF's. The the problem doesn't move/go away, look into replacing the Bank 1 primary O2.

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Kmccarthy714

Yea, thanks for the response, i have previosuly swapped MAF sensors and code came back same bank. Like i said i smoke tested the intake, no leaks found. My next try is to swap the A/F sensors and hope the code moves otherwise, im lost. Thanks for the help ill update you as soon as i find time to do the swap.

Jordo!

I'd just go ahead and order an O2 sensor. That's almost definitely it.

Probably a break on the wire somewhere -- I had that happen to one of my secondary O2's once. Sensor itself was ok, but the wire had a small break in the insulation on it. Swapped out the sensor and problem solved.

Good luck!

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