codes p0134 and p0507

[03silvaevo]

Recently got these codes after cam install and retune. Is p0134 have to do with the front or the rear 02 sensor? I'm running a test pipe with CEL mod. Maybe its just the rear 02 sensor causing it? Regarding p0507, that means my iac motor is on its way out?

[03silvaevo]

Replaced 02 sensor(front) and Iac motor. Fixed codes but now I'm getting PO172 and thats the only code I get now and no others(Thank God!). So how to go about preventing it from coming back?

[03silvaevo]

Car is currently being diagnosed by my tuner or his mechanics. He discovered I had replaced the 02 with a Bosch(15730) sensor and strongly recommended that OEM should always be used when it comes to o2 sensor. Well I was going to buy an OEM but couldn't stand the rip off price of 250+ so thats why I got a Bosch. I'm sure I'm not the only one using a Bosch and other members here know how expensive the OEM piece is. The new Bosch 02 eliminated the po134 and now I just have to worry about PO172. I think I had PO172 with the OEM unit(but it was on its way out due to PO134) as well so its gotta be something else(fuel trims maybe?). Anyway I went and bought the OEM 02, ripped a hole in my wallet at the same time and will find out tomorrow if it really gets rid of PO172 code. If it was a bad o2 then wouldn't the car throw a code other than PO172? Is PO172 a MAF code?

I even googled the causes for PO172 and people say it could be the maf sensor, injectors, dirty air filter, fuel pressure, vacuum leak

[BAMBAM]

DTC P0172: System too Rich
This could be caused by the MAF also the other things you have listed.