O2 Sensor HELP

[supernova_34]

I have an 03 sierra, I have replaced all 4 o2 sensors and reset the check engine light, but the light came right on after 10 miles, code is still saying that its the 02 sensor, Bank 2 sensor 1. I had to take the truck to a shop to get that sensor out the first time, they stripped the hole and they replaced the whole cat section of the exhaust and put the sensors back in. What is going on with the check engine light?!

 

[happy 2011]

ok so it's saying what about 02 sensor, Bank 2 sensor 1.. Lean or rich or heater or slow ect.

we need more info or the code #

 

[supernova_34]

it says HO2, and the code is P0155

 

[supernova_34]

I just checked the fuse as well, its good. I tried turning the ignition on and off 3 times, nothing as well.

 

[Molson02536]

I just checked the fuse as well, its good. I tried turning the ignition on and off 3 times, nothing as well.

If the sensors are new, then inspect the wire harness for any damages and repair or replace. Could be as simple as a corroded wire connection or broken wire.

Keep us posted and good luck
Moolson02536

 

[happy 2011]

so you have a heater problem. Qustion are any of the plugs the same on the o2 sensor. If so swap location of sensor to another and clear code and road test. wait for the light and see if the code followed the sensor or not. If it follows the sensor then you have a bad new sensor.

 

[supernova_34]

after some more investigation, there is power going to the harness. I tried testing for Ohms on that sensor and nothing happened, so i tried testing the other sensor to make sure i was testing it correctly, and I was. I am going to replace the sensor that didn't have results. My question now is, I replaced that sensor already just a week ago, would it be possible it can be blown again? if so, what is making it happen?

 

[rdm1465]

Hate to tell you this. But anything that has to do with electricity can go bad at any time. Yes, it may have only been a week, but it can still happen. As long as the system checks out ok, it is what it is. Here is a simple example of what I am talking about. Just changed a light bulb in the hallway a few weeks ago, and it blows. Replace it again and a few weeks go by, and blows again. How come there seems to be a light bulb that never seems to blow in the bathroom?

 

[Z15]

Just because its a new part does not mean its a good part. Lots of cheap made in China replacement parts, especially electronic parts. The OEM is expensive so these inferior cheaply made parts seem a better bargain. Very often they are not.

 

[supernova_34]

Thanks for all of the help. I replaced the sensor again, and it seems to be working fine now. Just a bad sensor. I bought Bosch thinking that wouldn't go bad as quick, but I guess even the good sensors do go bad quick occasionally.

 

[redneck813]

I just checked the fuse as well, its good. I tried turning the ignition on and off 3 times, nothing as well.

What does turnin the ignition on and off 3 time do exactly?

 

[Bill325]

Your problem does seem to have been a bad sensor, or bad connection. Also, consider that sensors are usually installed using an anti-seize compound on the threads. Make certain any anti-seize compound you use is labeled as being safe for oxygen sensors. Some older anti-seize compounds could poison the sensor .
Some older gasoline and oil additives you might still have can also affect oxygen sensors. Even some recently produced motor oils can weaken oxygen sensors because of anti-wear additives.