P0421 Audi

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P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1) – eEuroparts

P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1) – eEuroparts

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P0016 Audi A4 2.0t

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P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1) – eEuroparts

P0421 – warm up catalytic converter bank 1 efficiency below threshold

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P0471 code on 1.6TDI | Audi-Sport.net

P0471 code on 1.6TDI | Audi-Sport.net

P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1) – eEuroparts

P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1) – eEuroparts

p0421 code audi a4 2002, 2.0 fsi - AudiForums.com

p0421 code audi a4 2002, 2.0 fsi - AudiForums.com

Ford Oxygen Sensor Bank 1

Ford Oxygen Sensor Bank 1

P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold

P0421 – Warm Up Catalytic Converter Bank 1 Efficiency Below Threshold

P2197 Code: O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 1) - In

P2197 Code: O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 1) - In

P0421 Code | Audi R8 Forums

P0421 Code | Audi R8 Forums