Understanding P0420 and P0430 codes
Understanding P0420 and P0430 codes My stock 68k mile 2000 T/A had a P0430 code and no O2 sensor codes. I checked the O2 sensors and they too looked fair. The downstream sensor had some degree of voltage movement which is a bad thing.
I decided to replace the bank2 up and down stream sensors before I replace a cat. The new downstream sensor has a nice straight line on the graph which would be steady voltage.
I purchased the sensors from Rockauto.com for $28 ea.
The new sensors corrected the P0430 code for now.
I decided to replace the bank2 up and down stream sensors before I replace a cat. The new downstream sensor has a nice straight line on the graph which would be steady voltage.
I purchased the sensors from Rockauto.com for $28 ea.
The new sensors corrected the P0430 code for now.
Last edited by bgw70; May 16, 2015 at 01:29 PM.
I have now driven several miles with several engine startups and the computer has not detected any faults. The Evap is not a fault but only an incomplete test and should clear soon.
I am now confident the new O2 sensors corrected the P0430 code. Many will say this is rare.
I was chasing catalyst codes and did research and found out that you need 2 working O2 sensors to even be able to run the cat readiness test.. Then after driving 5-10min if it fails it will throw the car code..
Have you put more miles on the car? No more codes came up?
not sure...
I was chasing catalyst codes and did research and found out that you need 2 working O2 sensors to even be able to run the cat readiness test.. Then after driving 5-10min if it fails it will throw the car code..
Have you put more miles on the car? No more codes came up?
I was chasing catalyst codes and did research and found out that you need 2 working O2 sensors to even be able to run the cat readiness test.. Then after driving 5-10min if it fails it will throw the car code..
Have you put more miles on the car? No more codes came up?
The idle is still smooth and no codes so far.
The replaced the OEM AC Delco sensors with Denso. The drivers side is still has the original sensors.
