Error code
Infiniti All models code P0420
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Meaning
Catalyst efficiency below threshold, Bank 1. Failed upstream O2 sensor at lower mileage; catalytic converter at end of life past 150,000 miles. On the G35 and FX35, confirm O2 sensor function before condemning the converter
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Address of this page: https://www.remfixit.com/tr/infiniti/tum-modeller/p0420