2003 Yukon Problem

[HiHoeSilver]

I’m just leaving work and my engine light is on but I still have great power in the truck with no hesitation maybe my engine light didn’t go off and I thought it did

Get the code. How's the idle now?

 

[Nyjetfan21]

I finally had the chance to scan the codes and I got the same two codes P134 and P300. I already installed AC Delco platinum plugs and wires and also changed the O2 Sensor bank 1 sensor 1. I never cleared the code after I changed the plugs and wires. Here are the picture of the scan codes that I got.

 

[Nyjetfan21]

I finally had the chance to scan the codes and I got the same two codes P134 and P300. I already installed AC Delco platinum plugs and wires and also changed the O2 Sensor bank 1 sensor 1. I never cleared the code after I changed the plugs and wires. Here are the picture of the scan codes that I got. I also got a code P1133 now. I did clear all the codes this morning as well. Any help would be great thank you

 

[SnowDrifter]

That's upstream - senses air/fuel ratio and *can* cause your misfire.

Pull plug on oxygen sensor and check resistance on the pinouts. Hopefully someone can post specs on that, I'm walking out the door right now

 

[HiHoeSilver]

You never cleared the code so the light never went away? Start by clearing it and see if it comes back. You may have already fixed it.

 

[Nyjetfan21]

OK thank you I’ll let you guys know tomorrow or Thursday if the engine light comes back on after driving it . That should hopefully be enough driving for the light to pop back on, but hopefully it dont

 

[SnowDrifter]

Ohhh I misunderstood. Thought you were still getting codes after doing the work.

Yeah clear codes and just drive it. You can scan again to see if there are any pending codes - items that the vehicle is picking up on but hasn't yet met the threshold to throw a MIL

 

[Nyjetfan21]

Its been 3 days since I cleared the engine light and it popped back on last night. I rescanned it today and I got only 2 codes now instead of 3 codes. The codes I have are the same as above. Here is A pic of codes. I stated in a previous post I already changed the O2 sensor. I did buy a really cheap one online for 13.00. Any suggestions would be great. Ty

 

[Nyjetfan21]

Sorry i uploaded the pic to many times

 

[HiHoeSilver]

Sorry i uploaded the pic to many times

Sensor is a dud or you have a wiring problem. You can either do some diagnostics with a voltmeter, or switch the sensors between bank 1 and 2 and see if the problem follows the sensor or stays on bank 1.