Warm Up Catalyst Efficiency Below Threshold
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2: three-way catalytic converter efficiency for a warm device .
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Code P0420 Catalyst Efficiency Below Threshold (Bank 1)
P0421 Code: Warm Up Catalyst Efficiency Below Threshold (Bank 1) - In
P0431 - Warm Up Catalyst Efficiency Below Threshold Bank 2
P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold
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2: Three-way catalytic converter efficiency for a warm device
P0420 Catalyst Efficiency Below Threshold Bank 1
