A common emissions code seen in the field, a P0420 trouble code indicates that the catalytic converter isn’t functioning efficiently. To work at peak efficiency, the emissions or feed gases entering the catalytic converter need to be perfectly balanced and not excessively elevated. To resolve the...
1. What are the causes of showing P0420 code other than Aftermarket Cat? 2. If Cat is the problem, then why On-BoardMonitoring-Day-2 (latest) is showing better values than On-BoardMonitoring-Day-1? 3. Why is my oxygen sensor always show "Incomplete"? How do I make that complete...
Hey! I have a AP200 and got a P0420 code, I am going to try two tricks one after the other to try to fix it: 1 - clean the cat via "Liqui Moly...
Detailed information on the P0420 dtc trouble code. Includes why it happens and how to fix your car.
Since I need to pass my emissions test soon, does anyone know how long I need to drive for the ECU to clear any "permanent" ECU code, after I've already reset the codes with the Torque Pro app? Is there another method to clear any P0420 codes that do not show up with Torque Pro...
It might be better to change the thread title from 'P0420 fix' to 'P0420 test defeat' or something like that. It's not fixing anything, just preventing the car from noticing the converter's not doing what it's there for, and giving you the code. Sometimes people understand that and ...