The P0420 (whose official onboard diagnostic definition is ‘Catalyst System Efficiency Below Threshold’) code is a sign that a vehicle’s catalytic converter is subject to one or more problems. Such ...
Maintenance is an essential part of owning a car. Whether it’s simple tasks like an oil change or bleeding your brakes, plenty of jobs are DIY-friendly and can save you the costs of taking your ...
Answer:That's a new one for me, and I cannot see it having any effect on preventing a P0420 DTC, but it is illegal. P0420 indicates the catalytic converter has lost its efficiency in reducing harmful ...
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