Time for Oxygen Sensor Replacement.

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05-12-2009, 01:28 PM
BINNCZ71

Time for Oxygen Sensor Replacement.

I did a quick search, saw different results. My truck has 108,000 hard miles.
The cats were replaced at 65,000 miles by the dealer. However the oxygen sensors are original .

My truck is a 1999 Silverado Z-71 5.3, Auto with basic mods. Cold AIr intake, exhaust, 02 computer, 02 injectors, and Finish Line Level 5 tranny.
Tuning by allen nelson, but before he started, it ran a year or so with hypertech.

My mileage has dropped, plugs look great. Wires are good.

What oxygen sensor is everyone using, and do I need to replace all of them ?

Thanks,

Brian
05-12-2009, 10:18 PM
GasGuzzler

Check the FPR for leaks from the vacuum port. Clean the MAF too.
05-12-2009, 11:42 PM
yellowdemon327

Im havin the same issues, what are good o2 sensors to use. i only need 2 of them. rears are turned off.
05-13-2009, 09:35 AM
DamnYankee

Stock...get them from the dealer.
05-13-2009, 09:40 AM
Melissa@NelsonPerformance

Quote:

Originally Posted by DamnYankee

Stock...get them from the dealer.

x100
05-13-2009, 05:10 PM
cjriojas

I bought a Delphi O2 from rock auto Auto Parts Fast at RockAuto $40 shipped and no problems since. I've had it on for about an oil change. Stealership charges out the wazoo. 100 bucks
05-13-2009, 06:16 PM
Frenchy

Quote:

Originally Posted by cjriojas

I bought a Delphi O2 from rock auto Auto Parts Fast at RockAuto $40 shipped and no problems since. I've had it on for about an oil change. Stealership charges out the wazoo. 100 bucks

Delphi's are OE are they not?
05-13-2009, 06:29 PM
RedHeartbeat

They are what I buy and have had no issues with them other than one burning completely out once.
05-13-2009, 08:08 PM
GasGuzzler

Nippendenso (Denso) makes them for GM as well. So do a few other companies. What matters is getting one by VIN whether at the dealer or online....don't settle for broad applications.
05-14-2009, 10:46 PM
cjriojas

Dammit they were densos. My bad.