Got a p0420 code? you may need an oxygen sensor or you may need P0420 dtc code P0420 check engine light how to fix it yourself
P0420 DTC Code - Catalyst System Efficiency Below Threshold (Bank 1)
Check engine light on? here’s what to do
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Check engine light is on and codes p0420 and p0430
P0420 bank catalyst efficiency system threshold below engine check code light dtc limited diagnosisCheck engine light is on with codes p0420, p0440, p0441 and p0441 .
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