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YouTubeMaster Automotive Training
P0420 Part 2: Your Catalytic Converter May Not Be Bad
A P0420 doesn't always mean the catalytic converter has failed. A catalytic converter needs the correct temperature and proper air-fuel ratio to work efficiently. If the downstream O₂ sensor stabilizes after raising the RPM, the converter may simply not be at its light-off temperature—not dead. Learn how to diagnose catalyst efficiency the ...
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