I've recently had the codes p0132 and p0138. After they came on I replaced the spark plugs even though I didn't think they had anything to do with it. After that those two codes went away and now I have just p0135. Would replacing upstream o2 sensor fix this? Thanks

 

replacing the sensor might make it go away, but check the 02 sensor heater relay first

 

Is the relay in the power distribution center thing by the battery?

 

yes it should be (if your truck is equipped with one)

 

How will I know if its bad? Should I just replace it first? Sorry for all the Qs...Thanks in advance

 

swap the relay with one of the same type (ie horn) and see if they work switched.

you could also just clear the code and see if it comes back, if not dont worry about it.

 

Well I swapped the relay and reset MIL. Same result, so I ordered the denso o2 sensor from amazon. $30 and free shipping! Anyway i drove it today and noticed AFTER it warmed up every time I hit the gas or coast at low speeds it would act like it was about to stall and went down to about 500RPM and I lost power steering for a few seconds. We had a big snow storm today so it was kind of dangerous. Could this all be cause by the o2 sensor?

 

yes it could be, especially since it only does it once the engine is warmed up (warmed up = closed loop hence O2 sensor input is used)

 

thanks for all your help shrp.......I looked down my TB and saw oil puddled up on the plenum pan...So now Im thinking that may have something to do with it to. Ordering the kit from hughes so I can get that taken care of. Thanks again!!!!