latest code problem

[jniolon]

still having some intermittent code throwing problems... yesterday (and in the past) I've cleared out all the codes and then SES light goes out...

left the car sitting at a restaurant while we were eating... came out and started the car... I get a check engine soon light and 'reduced engine power' shows up on the driver info display.. from past experience I know if I wait a couple of minutes and restart it will go away

might happen tomorrow or next month... codes are a P0120 and a P2135 (I think) 135 is an O2 sensor code and I think a 120 is a throttle position sensor code.... the hoe runs fine, idles fine... everything is fine except this intermittent problem ???

btw it's a '03 tahoe...stock 5.3 with about 160K miles on it... no problems in that mileage other than plugs/ wires at 100K and an occasional MAF sensor cleaning...

any ideas ???
thanks
John

 

[Ojustracing]

Yes the 120 is the Throttle postion sensor 1, and 135 is a heated O2 code.

 

[jniolon]

Yes the 120 is the Throttle postion sensor 1, and 135 is a heated O2 code.

so why is it coming and going ???? and what to do about it ???

j:cool2:

 

[Ojustracing]

Well to sum up the code for heated o2. Normally this means the computer is seeing something wrong with the o2 heater circuit. Most times a replacement o2 is needed.

As for the TP code again the pcm is seeing something wrong with the circuit. This is the reason why your reduced power light is on. As for telling you how/what to fix this, my work software will not allow me to post info.

John