hey guys, i just threw the PO139 code, reading Heated Oxygen Sensor Circuit Slow Response (1 of 2), i already have an o2 simulator wired up since i have a test pipe, correctly and blinking, so does this mean the o2 sensor in the front is messed up or what...how can i fix this??.....thanks

 

i've already searched for this and didnt find anything about it, also 2 really old posts from 2005, please help me out, thanks

 

I have the same problem. I have the PO138 and PO139 and have cat delete pipe and perrin O2 simulator. O2 simulator is still blinking as well. I searched around and am pretty sure these codes are for the rear o2 sensor so if you find out, I'd like to know too. Good Luck.

 

bump......nobody knows??

 

does it specify bank1 sensor1 (b1s1) or (b1s2)?

 

i also had the same problem. bought a rear o2 sensor and it was fixed.( i have the mechanical fix for my test pipe). i also have an o2 simulator.

 

it said b1s2, so maybe change the rear o2 sensor

 

bump....no1 has an answer??? or suggestions?

 

Bank 1 O2 sensor is the one by the turbo, if that is bad, you need to replace it.

 

I got a EVO8, I just replace 02 sensor after cat for a brand new but im still have same check engine light on. I don't really care about the light, but I do about gas millage. Do any1 know if 15 mpg is ok?.. I just bought the car, and I don't know much about it.
02 sensor is new and I put back the cat. I did the welding and after that I install the 02 new sensor.
Why i keep getting check engine light on?
what is a test pipe??
if my AIR fuel mixture gage is not install correctly do that matters?
I just got 1 install but it doesn't read right.. I can tell. Just go back and forward 4 no reason.
please help
thank u all

 

you running a wideband??