Multiple o2 sensor failures help please

[crzhoss]

so I have a 2008 2wd Yukon 202,000 or so miles and since sept last year it has gone through 3 upstream O2 sensor and is now needing a fourth one truck has had zero prior issues that I know of and I've had the truck since it had 16000 miles on it been a awesome truck but something is causing this and I need some insight if anyone has any ...thanks in advance

 

[inmypassatlife]

What brand did you use to replace

 

[crzhoss]

What brand did you use to replace

Ac delco from the dealer been burned on aftermarket electrical parts before so I just pay a lil more sometimes

 

[aflumb]

if you went thru that many upstream then its no surprise the down stream on when out.

Because the other ones was bad and i will just assume that you still drove it until you where able to replace them later. This causes the eng to dump more fuel in most cases and there fore you messed up the rear. Just fyi thats good mile on the o2 sensors if you ask me. it was about time to replace them all

 

[crzhoss]

Only the the upstream o2 keeps burning out but I was thinking about changing them all this go around also

 

[aflumb]

i would suggest that, but do you have any other issues?

- CAT still good
- Spark plugs/wires
- Inte. coil pack
- Cam sensor
- Crank sensor

 

[crzhoss]

i would suggest that, but do you have any other issues?

- CAT still good
- Spark plugs/wires
- Inte. coil pack
- Cam sensor
- Crank sensor

No other issues what so ever truck has always ran great until it start this funny idle then throws a code for upstream O2 then it goes flat and sluggish till I pop a new one in