Hey y'all, I just replaced my 01 ex's original f23a1 with another after it lost compression in cyl 3, and now I'm having some CEL trouble. The codes it is throwing right now are P0131, P0505, and P0122.

I know the P0131 is the Bank 1 oxygen sensor, which I am almost certain is dead since the new engine had been sitting for a few years. This should clear itself after I get the right wrench to swap it with the one from the old engine.

P0505- Something with the IACV. I recently had to replace the one on the new engine with the old one, since the car was idling at 2300 rpm. Still throwing the code though. I am a bit lost on this.

P0122- I've read this is the TPS, but it didn't throw this code until I replaced the IACV. I will check the plugs again tomorrow when I have daylight. Any thoughts?

Any help is much appreciated!

 

Stupid question but, have you tried to clear the codes? Check your connections and wires again. What's it idle at right now? If it's still idling high I would look for a vacuum leak.

 

I haven't had access to a code reader that I can use to clear them, since autozone won't clear them. It is currently idling at around 900 rpm.

 

Take the airbox off. With the car running, put your finger(s) over the small hole in the bottom of the throttlebody . If the idle doesn't change the IACV is bad. If the idle does change look for a vacuum leak.