Hi Everyone,

My car is currently engine lights on after checked the code is P0420 & P0430.
Could you please tell me what can I do?
Should I replace all four O2 sensors?
If so, could you please tell me the part number of the O2 sensor?
I would appreciate it if you could advise me.

 

Hi,

Didn't you post the same issue already a few weeks ago? HERE

Do a quick forum search for P0430 and/or P0420 and you'll get some ideas what to check.
Also an introduction to the "New Members" section is highly recommended (see forum rules) as is some info on the car and what actions already had been taken in order to solve the issue.
Cheers, Alexander

 

Any signs the engine is running rich and carbon clouding up the sensors and the fwd cats from being effective .

The least expensive thing to do is to remove the sensors one at a time so you don't get the sensor position and it's connection mixed up . Important . Fwd left sensor first . Do not twist the wires as they are very brittle and different then regular wires , remove connector first . Note if there is any contamination color on the sensor . Inspect and clean the connector and ensure the wires coming out of the back of the sensor has some gap as the wires go in because the sensor needs a fresh outside air source to reference . Soak the sensor in a small jar of gasoline brushing or squiring gas into the vent holes were it maters . Don't tap it out on a hard surface but in your hand then squirt some more gas into the vents and let soak some more . Replace the Fwd left bank sensor and drive for a couple of days . Then repeat with the Aft left bank sensor with some driving time in between . Then do the right bank . Do not get too much thread anti - seize compound on the threads is this will mess up the sensor if it migrates into the important sensor membrane inside the vents .

I do not recommend doing all at once as this may confuse the ECU