00:00When the car's catalytic converter starts to fail, the check engine light often comes on.
00:03The computer detects that the gases are not being cleaned properly.
00:06and stores fault codes related to catalyst efficiency.
00:09The most common codes are code P0420, which indicates low catalyst efficiency in bank 1
00:16and P0430 indicates low efficiency in bank 2.
00:19The computer compares the oxygen sensor signal before and after the catalytic converter.
00:23If the signals are very similar, interpret that the catalytic converter is not cleaning the gases properly.
00:28and activates the fault code.
00:29But be careful, the problem isn't always the catalyst.
00:31It could also be a damaged oxygen sensor, exhaust leak, rich mixture, bad spark plugs, or failing injectors.
00:37Before changing it, check the system thoroughly.
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