Audi A1 CAYB Injectors

Audi A1 CAYB Overview

The Audi A1 with the CAYB 1.6L TDI engine was produced between 2010 and 2015. This vehicle uses Siemens VDO common rail diesel injectors (primary part number A2C9626040080) operating at fuel pressures up to 2000 bar. The CAYB engine in the Audi A1 produces 66 kW (90 PS) and 230 Nm of torque. When replacing injectors on the Audi A1 CAYB, always use new copper sealing washers and torque to manufacturer specifications. Each injector should be coded to the ECU after fitting.

Compatible Injectors

Common Injector Problems in Audi A1

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  Rough idle and engine vibration — Worn injector nozzles cause uneven fuel spray, leading to rough idle at low RPM. Most noticeable when the engine is cold.
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  Excessive exhaust smoke — Black or blue-grey smoke on acceleration indicates poor fuel atomisation. This is often caused by carbon buildup on the injector nozzle tip.
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  Poor fuel economy — A worn or leaking injector delivers incorrect fuel quantities, reducing efficiency by 10–20% in severe cases.
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  Engine misfire under load — Intermittent misfires during acceleration suggest one or more injectors are failing to deliver the correct fuel pressure.
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  Difficult cold starting — Degraded injector nozzles struggle to atomise fuel at lower cranking pressures, causing extended crank times in cold weather.

Other Engine Codes for Audi A1

Other CAYB Vehicles

Related Pages

Siemens VDO 1.6L TDI — browse compatible engines, vehicles, and injectors