Are these sensor ?
P0420 and P0430 are codes related to the catalytic converter effeciency. The catalyst will need to be replaced $$.
My daughter-in-law has a 2000 Nissan Maxima. It was pushing codes P0420 & P0430 and P0440 at times. It was also running a wee bit rough, especially on cold start.
Solution: Resistance from engine to ground was 3000 ohms. Resistance from negative battery to engine was the same. The only ground strap I could find was on the rear most cat in the assembly and it was broken off.
Ran two straps; One from engine to body, and a second from negative post of battery to body.
It cleared all problems. No codes pushed and engine runs so quite you can hardly hear it. Cold start normal
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
I have a P0420 code and it seems to be the cat needs replacing.
SOURCE: p0420 and p0430 faults no
this obd2 trouble code table can help you understand the meaning of code. Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required. Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady). Inspect the downstream heated oxygen sensor (HO2), replace if necessary Replace the catalytic converter One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into. for p0430, try: . 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 o2 sensor while you're at it. One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
and for the p0420, you can try :
SOURCE: check engine light-on OBD code's P0420 &
The codes are Catalyst System Efficiency Below Threshold (Bank 1)&(Bank 2).
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
A code P0420 may mean that one or more of the following has happened:
Some suggested steps for troubleshooting a P0420 code include:
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem.
SOURCE: 1999 cougar diagnostic code p0430 and p0420
Failed or faulty oxygen sensor, or faulty catalytic converter. It's actually the oxygen sensor reading that the catalytic converter is not functioning properly & needs relacement. That's provided the oxygen sensor is not faulty, which personally, I'd go for that first.
Both would explain excessive fuel usage.
SOURCE: code p0430 p0420
there is a update for the engine computer if you take it in to your toyota dealer they can do it for you. there is a campaign on this issue so its free of charge
SOURCE: P0420 & P0430 codes 99 silverado
codes p0420 and p0430 are both post o2 sensors, the ones after the convertor, both sides if replacing
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i have a p0430 code
o2 chevy truck has the code p0430- code is catalyst system efficiency below threshold righht bank,whay does this mean
Not necessiarly
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