Burning oil! 02 sensors! running rich AAHH!!!

It all started when i reinstalled my short tube doug thorley headers after taking the long tubes out because they are to loud for a new born baby...
first thing that happend was i got 5! fricking p0 codes im sorry i forget what ones i looked them up and they where all related to 02 sensors! i cleared them and they came back within 25 km... so i though to myself hey why dont i just plug in my 02 simulator and see what happends ... i plugged in the 02 simulator cleared the codes and what do you know everythings back to normal yaaay! ........ well here we are 3 months later and im running rich and burning like a qourt or oil ever couple weeks WHAT THE HELL this truck has never ever burnt oil so now i know there is something terribly wrong. i took my 02 simulator off today im waiting for the codes to come back i have already cleaned my maf sensor i will clean throttle body today.... is there a way too clean my 02 sensors? anyone got any other ideas of wtf is going on !!!!

upgrade include - k&n cold air - Doug thorley shorties with hi flow cats - urd y pipe and magnaflow cat back - and maf calibrator

 

One thing sticks out to me for the " Burning Rich " problem.

k&n cold air - and maf calibrator. Either or both of these are nothing but problems waiting to happen just as you are having, IMO.

As for the burning oil. None of the things you mentioned will cause an engine to burn oil in itself. That being said Burning an overly rich mixture over a period of time will wash the lubrication from the cylinder walls and increase piston ring wear / scoring and oil burning in a short order. That is where I think your problem lies. How long has it been running a rich fuel mixture.

Get a good shop to run a compression and leak down test on all cylinders.

 

Its hard to say the only reason i believe to be rich is thay my.muffler dumps before rear axle and i have soot on my axle but if it has been rich its been about 3 months i know of trucks going in tuesday i usually fix stuff myself but.this is over my head haha

 

Maf calibrator is from urd and was mapped for all my upgrades by gadjet