o2 low voltage help

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Nov 2, 2006 | 05:32 PM

5_02ls1

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From: Virginia

o2 low voltage help

my car has the following dtcs po131,137151,and157.my question is why does the pcm set these only at wot? the car has never ran like it should feels sluggish even after mods could all 4 o2s be bad? i think the cats may be gutted i know this would set a dtc for rear o2s i know low voltage means lean
below 200mv there are no other codes any help apreciated

mods are if it helps
3.73s
hypertech pp3 for gear swap
slp lid k&n
ported tb&maf
flowmaster cat back

Nov 2, 2006 | 06:34 PM

brad8266

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From: Watertown, NY

Voltage to all O2 sensors is low. You might have an electrical issue since all 4 are low. Check your voltages on the connectors.

Nov 2, 2006 | 09:07 PM

Doc

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Not all O2's are low. The fronts are "malfunctioning". The rears are "Low". If you don't have some sort of chicken abortion exhaust setup with a million leaks around the headers then it sounds like melted wires somewhere. The odds of all 4 sensors being bad for two different reasons...buy lottery tickets.

Nov 2, 2006 | 09:27 PM

5_02ls1

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From: Virginia

thanks

this is what i thought origonaly but my wife went to work and stuck babysitting my bro in law said they were probly bad ive got bad luck but not that bad. the exhaust system looks . great with no leaks. i hope this is the prob i hate troubleshooting

Nov 2, 2006 | 10:49 PM

Doc

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How long have you owned the vehicle? What mods are you aware of? What mods have you done to it?

Nov 3, 2006 | 12:03 AM

5_02ls1

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From: Virginia

the story

I bought the car in earl june of this year.dtc light was on I know I shouldve scanned it but the car had low grade fuel in it had a slight detonation at wot and up hills.I put 93 in it and it was fine afterwards.I was told this would cause the light to come on.Last month the rear starts whining so i tear it down to do a gear swap had to do a complete overhaul.when I ordered the gear and kit i also purchased the hypertech pp3 to recalibrate everything.I also got crane wires new plugs to do a tune up.I done the slp lid and k&n at this time too.when i hooked up the pp3 it gave me the codes I shold have looked them up then but my bro in law said they were emissions codes not to worry.during the tear down i also ported the maf and tb and done thetb bypass.thecat back and fra were done when i got car. I know it was stupid to modify with the dtcs but i was hoping to fix all problems at the same time.
the porting did seem to really help performance.but I justy want the stupid light off.please exuse my poor typing i know it sucks