I have a 2000 Chevy Silverado 1500 with the 5.3l
and it's throwing the code "catylist defficiency
below threshold" what is that and what do I need to
This usually means that the catalyst is bad and has to be replaced, but before doing that put some Octane 104 fuel booster in the fuel tank and hit the freeway, don't baby it, do some full throttle accelerations when the road is clear enough to so safely, if a freeway won't work then find a light traffic road somewhere and do some fast starts, full throttle downshifts, etc. then clear th code and drive normally and see if it returns, if it does, you can try one more thing and that is get the system live data scanned just too make sure you have a catalyst problem and not a sensor problem.
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