P0131 p0137 p0151 p0157

[sfls]

Hi all. Many thanks to all the information on this forum. Have learned alot and keep learning!

Have a 99 hoe 5.7 160k
I had an alternator go out back in April and tried to limp it home a few miles. I made it home with an engine light. P0131 P0137 P0151 P0157 all 02 sensor low voltage codes. Rear 02s and converters were changed last september, the front 2 codes were changed with densos in may after alternator. Spider was upgraded shortly after convertors were changed. I have yet to get rid of these codes. Checked ECM grounds, they were good, checked fuel pressure, it was a little low think it was 58 but went ahead and put a new delphi pump in a month ago. new fuel filter, air filter, cleaned MAF numerous times, even swapped it with another, no change, had a vacuum leak at the booster and i changed it yesterday. still came back. I put another used ECM in it about 3 weeks ago. with no other codes in it just the 4 in it.

Any ideas floating around?

Much obliged!

 

[Mark99Yukon]

Yes I am interested also!
I have the same codes coming up and it runs like junk after 5 miles.

Thanks for help.

I have new GM Oxygen sensors in upstream and rear 02 harness un plugged.
I have rebuilt engine with the GM hot cam also. All other parts stock.

 

[ColoradoTahoe]

Does It sputter on the highway or about 70mph if you barely touch the gas to keep speed? Mine was doing that with intermittent o2 voltage codes for a while. Finally progressed to a camshaft/crankshaft correlation code. (Don't remember the numbers sorry) found out that my distributor drive gear is worn down which affects timing and exhaust readings as well. Hope you find out what's wrong with your ride.