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Upstream sensors do not throw P0420, or P0430, those are your downstream
sensors. All they do is monitor the cats. They have no impact on air and
fuel mixtures. The P0420 means the primary cat is bad, or the sensor is
bad. These cars are very sensitive to flow rate. When the downstream sensor
readings match the upstream too many times, that is when the code is set.
It will not effect driveability of the car. When my secondary cat went, I got
the code, and those are not even monitored. I added spacers, and that took
care of that. Do not touch your upstream sensors, they have nothing do do
with P0420 or P0430 codes, those are downstream sensor codes.
TPMS, mine doesn't work right either. I can set all four of them, they all work for
15-23 miles, then all four go out, the light blinks, then goes solid. I stopped at a
sheetz, programmed them all again, ran 16 miles, and all four went out again. I
gave up on it.
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