Hi there:
DTC P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
DTC P0430 - Catalyst System Efficiency Below Threshold (Bank 2)
Could be some electrical problem, check wires and harnesses connections (cleaning job); also check description and testing HERE.
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SOURCE: 04 kia sorento runs poorly
Might be going super simple here but from what you have said have you checked the wiring on your sensors? If you know that one works and you swap it and its not working its very possible the wires farther up are shorted or burned somewhere.
SOURCE: engine light on code po141 oxygen sens bank 1 sens 2
bank 1 will be whichever side cylinder 1 of your engine is and bank 2 will be the opposite side. It's named bank 1 and bank 2 so that no matter how the engine is laid out, bank 1 is always on the same side as cylinder 1. I cannot say whether the right hand or the left hand one will be bank 1 as I do not know where your cylinder 1 is. The garage should know
SOURCE: Can not start 2000 Kia Sportage with 161 K Miles.
It sounds like the timing is not set correctly. When you installed the timing belt, there are two dots on the crank shaft and cam shaft sprockets - these two dots need to line up as close to eachother as possible. This is done by putting the belt on the two sprockets while both dots face eachother - lay them down on a table or flat (clean) surface with both dots facing eachother (crank shaft sprocket dot should be facing up, and cam shaft sprocket dot should be facing down) - carefully insert the sprockets onto the cam shaft and crankshaft simultaneously - this usually takes some finess and patients - once they are in place and you are confident they are lined up, you can put the coverback on. Also, make sure (first) that the number one cylinder is at TDC (top dead center, or in the "up" position. Pull the #1 plug out, manually crank the engine over or "kick" the engine over with the ignition (have someone do it for you). You can use a small screwdriver,inserting into the plug hole (not all the way) and when you see it pop up, poke it in again to feel the piston is at it's maximum height (if you hold the screwdriver on the cylinder and feel the screwdriver / piston go down, bring it back up again.
With it at top dead center, and the two dots facing eachother, put everything back together. Make sure all gaskets are not "bulging" out of the cover. (if applicable) .
If this is all done correctly, the car should start with no problem.
Please let me know if you need further assistance.
carsandcomps,
Guru, Premium Expert @ Fixya.com
SOURCE: I have a 2004 Spectra.
Well, it is either a timing belt/chain going out or a bad crank position sensor most likely causing the other problems. The O2 sensor may be bad as well but that usually doesn't cause the Misfire. The vehicle on board computer is confused, that is why it is throwing all those codes. and why it gives you that 1166 code which isn't defined. Check the crank position sensor and the timing and timing belt first. Once you have that fixed the rest should clear up.
A code P0430 may mean that one or more of the following has happened:
First, inspect for exhaust leaks.
Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen sensor while you're at it.
Thanks.
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