Cadillac Escalade, EXT and ESV Forum - 2007-2014 Discussion, Check Engine Catalyst Problem Please Help Me in Cadillac Escalade Forums; My check engine light is on and I checked the code with my predator and it says "P0430 Catalyst System ...
My check engine light is on and I checked the code with my predator and it says "P0430 Catalyst System Efficiency Is Below Threshold (Bank 2). Does anyone know what this means and how I can fix it?? I cleared the code but it keeps coming back.- Thanks
Quite simply, it means you need to replace the catalytic converter.
The computer monitors the data from the pre catalyst O2 sensor and compares it to the data coming from the post catalyst sensor.
One of the catalyst's jobs is "oxygen storage". It is hard to explain but the oxygen levels rise and fall rapidly in the exhaust manifolds but in the cat this is balanced out a bit, when the gasses flow out of the rear of the cat the dips and peaks of the pre cat sensor should flatten out, this indicates you have a healty catalylst.
If the post cat sensor starts to mirror the dips and peaks of the pre-cat sensor then the computer knows it is not doing its job and the code will set.
Many will tell you to do a dance, moving O2 sensors around and needlessly replacing them. Do it if you want but you won't get anywhere. One of the enable criteria for P0430 is that the O2 sensors have to pass their self diagnostics FIRST. If O2 sensor codes are set, the catalyst test won't run at all.
Depending on the configuration of the exhaust you might have to buy the whole Y pipe with both cats.
At any rate, on an Escalade the right side is bank 2. Be sure if you replace one... that it is the correct one.
what should I do? Take it to service? I cleared the check engine light again last night and it never came back on...will they still be able to tell if i bring it to service? Also could any of this be caused from using octane booster, my throttle body spacer that i recently installed, or the fact that i programmed my car with a predator programmer?
You could have done some damage to the cat with all that. Most likely the additive.
No need to give the dealer all that info.
Wait for the MIL to come on (check engine light) and take it in, act dumb and tell them the check engine light just came on.
Heres the basics, the CATS are coated in platinum, this is why there expensive, there are substances you can pass over them to remove the coating, one is fuel this is why you should never turn the engine over more than about 3 seconds if it doenst fire as it pumps neat fuel through and wipes the cats out, hence they never do there job.
So there will be other substances to do the same thing, your need to do research,
Basic is remove anything you put on, or dont tell the dealer it should just show up as a "bad" CAT and be replaced.
CATS should last about 10 years (assuming they dont corrode first).
Pouring chemicals not recommend by the manufacturer in the tank can affect the catalyst material and render it useless.
Sort of like pouring urine into beer.
Sure it says beer on the label... but do you want to drink it?