P0131 and P0151

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10-28-2007, 02:05 PM

Johnny Canuck

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Join Date: Oct 2007

Posts: 2

Johnny Canuck is an unknown quantity at this point

P0131 and P0151

Hello everyone, my first post. I hope you can help me out. I have a '96 Blazer which I love. I have persistent P0131 and P0151 codes being set. It usually occurs when I really step on the pedal hard (like passing someone on the highway) I know that the P0131 is the O2 sensor circuit low voltage (bank 1 sensor 1) and the p0151 is O2 sensor circuit low voltage (bank 2 sensor 1), but I don't know what to do about it. Should I have both O2 sensors replaced or could something else be causing the problem like a bad catalytic converter? I gave it a good tune up; new cap and rotor, wires, plugs, TPS,fuel filter, air filter, cleaned my MAS etc.

Thanks for any help...

10-28-2007, 04:34 PM

swartlkk

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Join Date: May 2005

Location: Waterloo, NY

Posts: 41,137

RE: P0131 and P0151

How does the truck idle? A vacuum leak could cause this issue.

How does the truck run when you are hard on it?

10-28-2007, 09:01 PM

Johnny Canuck

Thread Starter

Join Date: Oct 2007

Posts: 2

RE: P0131 and P0151

When it idles it sounds like the timing needs to be adjusted, like it's idling slow. I know the timing isn't something you can adjust on a '96. When I'm hard on it it sometimes really bogs down, has NO power for a couple of seconds and then the power kicks in and the truck will have a burst of power. The new TPS seems to have helped a bit. The truck will seem to run great for a while (really responsive to the pedal, lots of power) and then occasionally when I need to pass someone on the highway it will act up again and then trip the codes.