P0420 Cadillac Cts

07 Oct 2023
posts
Erica Mayert DVM

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How to fix PO420 code (Cadillac) - YouTube

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3.6 sts o2 sensor location.... p0036

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3.6 STS O2 Sensor location.... P0036 | Cadillac Owners Forum

P0420 – catalytic converter system, bank 1 -efficiency below threshold

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