Mercedes Vito 639 Ignition Switch A6399002201 | A6399002201 Fitment & Buying Guide

Mercedes Vito 639 Ignition Switch A6399002201 – A6399002201 Identification, Fitment & Buying Guide

Overview

Mercedes Vito 639 Ignition Switch A6399002201 is listed by Burton VAG Spares under the exact reference A6399002201. This guide is designed to help a buyer identify the component correctly, compare the number on the original part, and understand the checks that should be made before purchase. Automotive components can look nearly identical while carrying different revisions, software levels, connector layouts or internal specifications, so the printed part number is more important than a visual resemblance. The live product description states: Description Mercedes Vito 639 Ignition Switch A6399002201 OEM / Part Numbers: A6399002201 Fitment: Suitable for the stated vehicle/application where the original component carries the exact OEM/reference number A6399002201. Vehicle specifications can vary, so do not order by model name alone. Condition: Used genuine automotive component. Normal cosmetic marks and signs of previous installation may be present. Damage: No specific damage is stated unless shown or described in the listing. Please inspect the product photographs carefully before ordering. Included Components: You will receive the component shown/described in this listing. Ancillary parts, wiring, brackets, keys, coding services or accessories are not included unless specifically stated. Fitment Verification: Match the complete. The safest starting point is always to record the complete number from the part already fitted to the vehicle and compare it character for character with A6399002201.

Why the exact part number matters

Manufacturers often reuse the same general housing across several models and years. A component may therefore appear physically compatible but still be electronically, mechanically or software-incompatible. Prefixes, suffixes and revision letters can distinguish important variants. When checking A6399002201, include every letter and digit shown on the original label. Do not rely only on a vehicle model, engine size, registration year or photograph. If the original number differs, obtain a confirmed cross-reference before ordering. This approach reduces avoidable returns and prevents a workshop from spending time fitting a part that was never intended for the exact vehicle configuration.

How to verify fitment before ordering

Start with the original component removed from, or still fitted to, the vehicle. Photograph the complete label so the reference can be enlarged and checked. Compare the full OEM or manufacturer number with A6399002201. Then check the connector count, mounting points and any visible revision markings. Vehicle registration or VIN information can help a specialist narrow the application, but it should support rather than replace the direct part-number comparison. Where a vehicle has already had modules changed in the past, the number on the currently fitted unit may itself need confirming against manufacturer data or a diagnostic parts catalogue.

Diagnosis before replacing a component

A stored fault code does not automatically prove that the component itself has failed. Wiring, low battery voltage, poor earth connections, water ingress, damaged terminals, blown fuses, communication faults and previous coding changes can create symptoms that point at a control unit or electrical component. Before replacement, read the vehicle with suitable diagnostic equipment, save the fault codes, check supply voltage and grounds, and inspect connectors for corrosion or damage. If the part is mechanical, confirm that the surrounding system is not creating the fault. A correct diagnosis protects both the new part and the time spent installing it.

Used genuine parts and condition

A used genuine component can be a cost-effective alternative to a new dealer part, especially when the original item is discontinued or expensive. Used parts may show normal cosmetic marks from previous installation, storage and handling. Cosmetic appearance is not a reliable indicator of compatibility, so identification must still centre on the reference A6399002201. Review the live product photographs carefully and use them to compare connector shape, mounting points and the label. Any accessories, brackets, wiring, keys or ancillary pieces should only be assumed included when the product listing specifically states that they are included.

Programming, coding and adaptation

Many modern vehicle components interact with immobiliser, security, configuration or network systems. Depending on the part and vehicle, installation may require coding, programming, cloning, adaptation, calibration or basic settings. Some components are plug-and-play, while others are not. Do not assume either outcome without checking the specific application. A competent auto-electrician, diagnostic specialist or marque specialist can usually confirm the procedure before the part is purchased. Planning this in advance is particularly important for modules, ECUs, body controllers, ABS electronics, instrument clusters and other networked components.

Installation checks

Before fitting, disconnect or protect the vehicle electrical system as required by the manufacturer and use correct workshop procedures. Compare the replacement and original parts side by side. Make sure plugs are fully seated, locking tabs are intact and no pins are bent or pushed back. After installation, clear old fault codes only after they have been recorded, then rescan the vehicle and verify that the original complaint has changed as expected. Where calibration or coding is required, complete it before judging the replacement part. If the original fault remains, continue diagnosis rather than assuming a second component is immediately required.

Avoiding common ordering mistakes

The most common errors come from buying by appearance, vehicle model alone or a partial part number. Another frequent problem is overlooking the final suffix or revision letter. Sellers may describe several related vehicles in one title because the family of parts is widely used, but that does not mean every version interchanges. For A6399002201, treat the complete reference as the primary identity. If the listing title contains other numbers, compare them with the original part as supporting references rather than automatically treating them as interchangeable. When uncertain, ask for a fitment check before placing the order.

What to send for a fitment check

For the quickest useful fitment check, provide the vehicle registration or VIN, the make and model, engine or gearbox details where relevant, and a clear photograph of the original component label. Include the complete part number exactly as printed. If diagnostic fault codes are available, include those as well because they can help distinguish a compatibility question from a diagnosis issue. This information gives Burton VAG Spares or your workshop a much better basis for checking the part than a short description such as “it looks the same” or “it came from the same model”.

Buying from the live Burton VAG Spares listing

The live product page should be treated as the current source for price, availability, photographs and the exact item being offered. Because stock changes, always open the current listing rather than relying on an older search result or cached page. Check the title, the complete OEM number and the images again immediately before ordering. The listing for A6399002201 is here: View the exact A6399002201 product on Burton VAG Spares. If anything on your original component does not match, contact Burton VAG Spares before purchase so the difference can be checked.

A practical final checklist

Before ordering, confirm five things: the complete part number matches A6399002201; the physical connectors and mountings correspond with the original; the vehicle fault has been diagnosed rather than guessed; any programming or adaptation requirement is understood; and the live listing photographs and included items have been reviewed. Keeping a photograph of the original label and a copy of the diagnostic scan is useful if further technical questions arise. These simple checks take only a few minutes and can save considerably more time during installation, particularly on vehicles where several near-identical revisions were used during the same production period.

Summary

For Mercedes Vito 639 Ignition Switch A6399002201, the key reference is A6399002201. Match the complete number, confirm the vehicle diagnosis, compare the physical details and plan any coding or calibration before fitting. A genuine used component can be an effective repair solution when the identity is correct and the surrounding vehicle system has been checked properly. Use the live Burton VAG Spares product page for the current item details and ask for a fitment check when there is any uncertainty. Accurate identification is the best way to turn a parts search into a successful repair rather than another diagnostic problem.