P0421 Audi
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P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold
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P2197 Code: O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 1) - In
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P0421 Code: Warm Up Catalyst Efficiency Below Threshold (Bank 1) - In
P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold