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Persistent 02 sensor codes!

GasJobMafia
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GasJobMafia Enthusiast

GasJobMafia

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Need your help on this one! Trucks been poping o2 low voltage codes at me p0131 p0151 etc, so I replaced the 2 upstream ones and it's still givin me upstream o2 sensor codes! Symptoms are lack of power from mid range up and it seams to shift kinda funky somtimes

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SpartanAutoworx Enthusiast

SpartanAutoworx

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Has the PCM ever been replaced?

 

I had a customer with a similar issue. He had a 5.3 truck and I found the computer had been replaced with that from a truck with a 6.0 vin. Reflashed the PCM Codes went away.

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GasJobMafia Enthusiast

GasJobMafia

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My programer states its flashed to a 5.3 so I doubt thats the issue, could double check! will the difference in brands acctually make a large difference?

also I'm thinking possibly clogged cats?

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