Parts search by VIN, plate or make and model: which to offer

A VIN decode reads the code stamped on the car and returns make, model, model year, body style and engine family. Some markets add trim and gearbox. Brake size and option packs are usually missing.

A plate lookup asks a national registry for the record behind a registration, and the answer depends entirely on what that registry chooses to release. Some return the full VIN and model name. Others stop at make, year and engine size.

Make, model, year and engine code is the buyer’s own answer. Its accuracy rests on your fitment table. It also rests on the buyer finding an engine code, stamped on the engine or printed in the service book.

VINs never contain the letters I, O or Q, so a typed O or I can be rejected at once. Ask the buyer to check the registration document, not the dashboard plate. A swapped engine decodes to the build the car left the factory with, and that is the wrong answer for the part.

Plates fail differently. A registry usually shows the car as first registered, so a later engine change, a lowered suspension or a fitted tow bar may never appear in the answer. Foreign plates return nothing at all.

Make and model fails at a facelift. A buyer who picks a model and year may be choosing between two bodies sold in the same year, or between brake discs that changed halfway through production.

A garage built on make, model, year and engine code needs a fitment catalogue, bought in or built by your own staff. After that, each search is free. Plate and VIN lookups usually arrive as a paid call to a data supplier, charged per lookup or through a monthly bundle.

Some governments publish a free VIN decoder. It may cover only that market’s cars. Weigh every fee against the part. A paid lookup before a wiper blade sale can eat the margin, but before a brake disc sale it can prevent a return that costs carriage both ways.

Store every answer you pay for. Save the decoded car in the customer’s account and the next order from that car needs no second call. Read the supplier’s licence first, since some limit how long results may be kept.

Sooner or later a lookup returns half an answer, or none at all, and the buyer needs a next step rather than an error page. Say what is missing. Then ask for it.

Ask only for what the part needs. For brake pads that means the caliper maker and disc diameter, while an oil filter needs the engine code and nothing else.

Offer a human check for risky parts. A photo of the old part’s stamped number, a photo of the registration document or a message to the parts counter lets staff confirm fit before dispatch.

Build the garage first. It covers every buyer, carries no fee per search and produces the fitment table that plate and VIN results must still be matched against.

Plate lookup comes second, and only where a supplier covers your main market, because buyers know their plate by heart and rarely know their engine code. VIN comes third, as a check rather than an entry point.

Ask for the VIN at the basket on parts that vary by build, such as brake discs, wheel bearings, clutch kits and sensors. Then take last month’s wrong part returns for one part type, note which lookup each buyer used and see which method would have caught the error.