Time for catalytic converters, or not

[pontyackker]

96 tahoe 5.7L 225,000. throwing code on O2 sensor bank 1. I replaed sensor a couple years ago when I got this. Suspect I have some oil fowling going on. Use a mild amount of oil maybe 1/2 qt per thousand. Proceed with new catalytics or do a repair on the engine first?

I'd prefer to not break what isn't messed up. Truck runs great, no issues despite CEL.

 

[Schurkey]

96 tahoe 5.7L 225,000.

throwing code on O2 sensor bank 1.

WHICH code? WHICH sensor? Upstream? Downstream?

I replaed sensor a couple years ago when I got this. Suspect I have some oil fowling going on. Use a mild amount of oil maybe 1/2 qt per thousand. Proceed with new catalytics or do a repair on the engine first?

You have an O2 sensor code. Why are you thinking of catalytic converter(s)?

 

[GoToGuy]

Bank one sensor 1 is monitoring fuel mix sends data to ecm. If your cats were going bad you would have codes for sensor two, the after cat sensors. Don't guess, do the diagnostics.