I have an 02 blazer 4X4 LS 4dr with a 4.3 vortec, just this last week i have gotten alot of hesitation only after the car has been run - driven for a while and is warmed up fully, then when taking off from a light it has no power at all and sputters and misfires/ backfires, then the service engine soon light comes on. i have a code reader and gor a p0131 o2 sensor low voltage, p0151 o2 sensor low voltage, p0134 o2 sensor low voltage. I cleared the codes and the light went out for several days after it was fine, then tonight it did it again, hesitate, no power, misfiring, backfiring and light. I do not have my reader with me so i do not know if it is the same codes or not. What is the problem, the weather since this has started has been really hot upper 80's to mid 90's and humid if that matters. other recent changes are a sound system was installed just before these problems surfaced. Please help. oh yeah the car has 78,833 miles on it.

 

We'll continue this discussion over here:
O2 sensor? or more?

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