Troubleshooting P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1)
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YouTubeHVAC Mechanic
Troubleshooting P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1)
Causes and fixes of a P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1) A P0420 code is set when the computer (ECM/PCM) detects that the Bank-1 catalytic converter has falling below 92% efficiency. The catalytic converter is monitored by two O2 sensors located on the exhaust. If the catalytic converter is the issue cleaner can be ...
157.3K viewsOct 26, 2024
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