Audi A1 ECU 03L906023KQ: Exact Number Fitment Guide

Identify 03L906023KQ

Audi ECU 03L906023KQ appears in used listings for A1 1.6 TDI CAYC applications. The complete number is important because closely related 03L906023 references can belong to different engine or software configurations. Always compare the original label first.

Confirm the engine

The CAYC engine reference is useful supporting information. Check engine code, vehicle year, gearbox and the exact ECU number together. A vehicle model name alone is not enough because different engines and transmissions can use different control units.

Check Bosch and hardware references

The label may contain additional Bosch or hardware numbers. Record them when present. These references help identify the unit but should not be treated as automatic interchange numbers without verification.

Programming

A replacement used diesel ECU may require coding, programming or immobiliser adaptation. This is particularly important where the original unit contains vehicle-specific data. A professional diagnostic specialist can confirm the required procedure for the exact vehicle.

Physical condition

Inspect the aluminium housing, connectors and mounting points. Look for broken plugs, corrosion and signs of water ingress. Normal marks from removal can be described as used wear when they do not affect operation.

Used pricing

eBay UK listings for 03L906023KQ show a range of prices. The spread can depend on donor vehicle, testing, included components and seller. A BVS listing should use exact-number used evidence and avoid presenting new-part prices as used benchmarks.

Photography

The label should be readable in the product photograph. The customer should be able to compare 03L906023KQ with the original ECU before buying. A generic A1 ECU image is not sufficient because several modules can look similar.

Included components

If the ECU is supplied alone, say so. Plugs, wiring, keys and immobiliser modules should only be included where specifically shown or stated. This is especially important for electronic components because a kit can require a different programming process.

Final check

Compare 03L906023KQ, CAYC engine application, gearbox, connectors, mounting points, condition and coding requirement. That evidence trail gives the buyer a clear basis for ordering a used Audi ECU.