Posts Tagged: P0430
P0420 caused by bad O2 sensor?
P0420 can it be caused by a bad O2 sensor? Does a bad oxygen sensor cause a P0420 code? Answer: Rarely, but it depends on the vehicle On many pre-1996 vehicles the upstream oxygen sensor uses a “narrow band” type sensor, and post 1996 vehicles often use this type of sensor as the downsteam sensors. These sensors compare the amount of oxygen in the exhaust to the amount of oxygen in the outside air. It obtains and ambient sample through one of the wires (between the copper and the insulation). … Read More
Fix Code P0420
Fix Code P0420 A P0420 code means your catalytic converter has failed an efficiency test. In other words, it’s not removing harmful combustion byproducts from the exhaust. Many people think that the way to fix code P0420 is to replace the oxygen sensors. That’s wrong. In fact, the vehicle computer can’t even come to the conclusion that your catalytic converter has failed the efficiency test if your oxygen sensors are bad. So don’t waste your time and money on oxygen sensors. What to do if you get a P0420 code? … Read More
Fix code P0430
Code P0430 Catalyst System Efficiency Below Threshold (Bank 2) NOTE: Codes P0420 and code P0430 are similar. I wrote a much more detailed explanation of how an emission system works and what causes these codes. Read this post and then refer to this more detailed post. Code P0430 means the catalytic converter for bank 2 has failed it’s testing. The oxygen sensor in front of the catalytic converter switches back and forth between rich and lean as the computer constantly changes air fuel mixture. If the catalytic converter is doing … Read More