Can A Bad O2 Sensor Cause A P0420 Code? | Real Fix Steps
Yes, a failing O2 sensor can trigger a P0420 by skewing catalyst-monitor data, even when the converter is still doing its job. A P0420 can feel like a trap. The code points at the catalytic converter, the part is pricey, and plenty of cars still drive “fine” while the light stays on. That’s where the
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