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O2 Sensor Replacement Needed?

dukbludvl

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dukbludvl Enthusiast

dukbludvl

Posted
Posted

What is the harm that can be done from not replacing a post-cat O2 sensor? Will it change how the vehicle operates?

 

My 2000 Yukon 2ws 5.3L with about 170K miles on it recently threw the P0300 code for multiple engine misfires. I replaced the plugs, wires, EGR valve and PCV valve. Didn't really fix the problem. So, I took it in and they said I had a bad intake gasket and that the post-cat 02 sensor on the pass side (bank 2, sensor 2) was bad. I had replaced all the 02 sensors about 8 months (15K miles) ago. Do you really think my 02 sensor is bad? I had the codes read at AutoZone, and there's no code for the 02 sensor.

 

Also, do you think it could be another problem, like my cat converter going bad? Fuel pump weakening (the fuel sending unit is bad and has been for a while... the needle jumps all over the place), MAF sensor needs cleaning?

 

The truck has chugged a little bit right when I picked it up from the garage, and it seems to idle a little more roughly now than it does normally.

 

Please help.

Bish Senior Enthusiast

Bish

Posted
Posted

After cat o2 sensors do nothing other than light the light to service. They have no control over engine management.

svensk Senior Enthusiast

svensk

Posted
Posted
After cat o2 sensors do nothing other than light the light to service. They have no control over engine management.

Haha yeah... my CEL has been on for months now because of the p0300. My truck drives fine so I know the cats really can't be plugged.

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