My CEL update--changed sensors

I have seen a lot of posts recently about O2 sensors (and A/F sensors). I have CEL light (P1135 the last time I had it checked) that pops up every now and again. The last time I saw it was when I was stuck in traffic and the truck sat running for around 5 minutes and didn't move a foot. An hour later it went off after a few short trips. Something about the truck heating up--weather has been warmer a bit here...thoughts???
So I ordered new sensors, both. I replaced them today with minimal problems. For those looking to change them soon, the only suggestion that I would make is to remove the A/F sensor (the front, or up-stream sensor) from the exhaust before you try to unplug it. For me, it made it ahelluva lot easier! Doing so allowed me to maneuver the wire around so I could see and grab the plug easier. Also the other sensor had some sort of sheild on it. The razor sharp beast put up a fight! (good news is, the bleeding has almost stopped) Be careful when you go to replace that sensor. I decided not to replace the sheild for fear of having to tackle the task again someday. Hopefully this remedies my problem and I won't be facing an ECU change like another member is.

 

I just had the same problem on my truck. CEL would come on when I was sitting in traffic, or towing or something. I figured it had to do with the truck heating up a little, somehow. Even though I was never running hott...

Got the code read- up stream O2 sensor. Got quoted $180 at Advance Auto, found one at RockAuto for $99. Just put it in this weekend, so far so good. Install was suprisingly easy for how rusty things were underneath....