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__FORCETOC__ === 16805/P0421/001057 - Warm Up Catalyst; Bank 1: Efficiency Below Threshold === ==== Possible Causes ==== * Warm Up Catalyst Bank 1 faulty ==== Possible Solutions ==== * Check Warm Up Catalyst Bank 1 ** Set Readiness * Replace Warm Up Catalyst Bank 1 ==== Special Notes ==== * When found on the following, there may be a firmware update: ** 2000 - 2001 Passat with ATQ engine, see TSB 01-07-07 ** 2000 - 2001 A4 or A6 with ATQ engine, see TSB 26-08-07 ** 2001 Allroad with APB engine, see TSB 01-08-20 ** 2001 A4 or A6 with APB engine, see TSB 01-08-34 [[Category:Fault Codes]]

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