The word KESSY can appear in listings for one access/start-authorization module and in listings for a larger set of electronics. Decide which format your repair needs before comparing prices. The component references and the contents section should drive the choice.
A single module has a specific identity
Our 3D0909137F KESSY module is also written as 3D0 909 137 F. Its listing identifies Continental 5WK48505A and a 433 MHz remote-radio reference. Our separate 3D0909137FX module has the complete FX suffix and a 5WK48508A reference. Treat the full references as identification data. Any proposed substitution needs confirmation for the vehicle and its security configuration.
Keep a photograph of the original label. Compare hardware and software markings, connector layout and radio frequency where shown. Removing spaces from an OEM number can help a search; dropping the final letters changes the reference you are checking.
An electronics set has several identities
For example, the Audi Q7 3.6 set with ECU 03H906032CA lists an engine ECU, cluster, steering lock, reader, key, KESSY and additional named modules. It is a different supply format from one standalone VW KESSY module. Check each needed component in the individual listing, rather than assuming a standard set contents list.
Confirm the security-system plan
A standalone used module may retain donor data. Ask the specialist how the replacement will be adapted to your original ECU, steering lock and keys. For a set, check whether the supplied security components and key are described as matched, and whether the receiving vehicle’s engine and electrical configuration are compatible.
VW/Audi immobilizer implementations differ. Ross-Tech’s immobilizer reference separates generations and replacement procedures. Do not assume that a procedure demonstrated for another model or immobilizer generation applies to your car.
Before placing the order
- Copy the complete original part number, suffix and supplier reference.
- Check the key-radio frequency and vehicle specification where relevant.
- List the components your repair requires and compare them with the supplied items.
- Ask the installer to confirm any adaptation, key work and configuration.
- Read the actual photographs and resolve unclear markings before buying.
Browse body and security modules or matched ECU and key sets. For an engine-computer-only repair, also see our Audi ECU selection guide. Send a label photo and the item link through Contact if you want help narrowing the search.