PO147 indicates the heater circuit on the O2 sensor is bad, Could be wiring or the sensor itself.

 

i just replcaed the cat it was the problem, i have all my power however the car is idling at 2k now and engine light still stays on, also a scanner wont read the ecu anymore, under the hood the fuse for ecu if i put a fuse in it the car wont run any help please we almost have this car fixed

 

update just found a black top piece of the maf stuck in the tb where the maf sits, it was broke off the maf

 

that could be a problem

 

car is still idling high, and check engine light wont go away. failed a smog test because it says the mass or volume air flow circuit has a low input, but i already changed the mass air flow

 

codes are P0102 AND P0507, after replacing the cat, and the check engine light will not go away, still high idle. already replaced MAF WHAT ELSE CAN THIS BE!!!!

 

ok guys whos got a trouble shooting chart for po102 and po507. try searching. do you have a k&n filter? is the maf remanufactured?

 

the maf is from auto zone, its a cone filter not a k&n, its a spectra

 

I didn't read this whole thread. Just the first post by the OP. So it's stumbling after 3k rpm's. Mine was doing this too for about a month before I did a fuel pressure test. I had a weak fuel pump. Sorry if that's already been covered. I didn't have time to read all the posts in the thread. If you haven't done a pressure test yet, do that next.

 

Disregard what I said about the pressure test. I just read the whole thread. ***Smacks Myself In The Face!!!***