UK parts guide

How to read and record car part numbers

By Mekivo · Updated

A clear record of the number on an existing part can make a parts enquiry much more precise. The useful skill is to preserve the complete information and ask the right person to interpret it. Do not turn a partly readable label into a confident order just because a search result looks similar.

This guide offers Mekivo’s practical recording and comparison workflow. It is not a government part-number decoder, and it does not claim that a prefix, suffix or sequence has one meaning across manufacturers. GOV.UK sources below support the vehicle-identification, counterfeit-parts and safety guidance; a manufacturer, authorised distributor or competent garage must resolve the technical fitment of a particular part.

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Make a vehicle record before a parts record

DVLA’s public vehicle service can help you check basic information including engine size, fuel type and manufacture year. Its VIN guidance concerns the identity of the whole vehicle. Neither page is a catalogue saying which replacement component fits a particular car, so use that information to describe the vehicle when asking for help.

For your own enquiry sheet, put the registration and VIN in a vehicle section, then add the model description and any relevant modification the installer tells you about. Put component markings in a separate section. This prevents an easy communication error: sending a vehicle identifier when the supplier requested a part marking, or the reverse. If you do not know a requested specification, mark it unknown and ask how to verify it instead of choosing the closest-looking option.

GOV.UK sources: GOV.UK: Get vehicle information from DVLA; GOV.UK: Vehicle identification number

Photograph before transcribing

The Intellectual Property Office recommends photographing parts, packaging and labels when reporting a suspected counterfeit. We suggest using the same evidence habit while identifying an ordinary purchase: save a clear view of the complete label and a wider view showing which component it belongs to. Do this only where the markings are safely accessible; ask the installer to record anything that requires removal.

Copy each visible line exactly into your notes, retaining spaces, dashes, leading zeroes and final letters. Record uncertainty explicitly: for example, “third character unclear in photograph”. Take another image or ask the supplier rather than silently changing a letter O to a zero. Keep the photograph beside your transcription so another person can check it. Our workflow does not assign a technical meaning to every line; it preserves the evidence for someone who can.

GOV.UK sources: GOV.UK: Business guidance on identifying and reporting fake parts

Ask what each marking represents

GOV.UK consumer guidance notes that even cars sharing a model and year can need different parts. That is a useful reason to resist the leap from a similar number to a confirmed match. Treat all visible markings as unidentified until the supplier explains which one is the ordering reference for the component you need.

Our suggested questions are: which number should I order against; does every character matter for this application; and, if the proposed replacement carries a different reference, where is that equivalence documented? Do not invent a rule that a final letter is always a revision, a longer number is always newer, or the same first digits guarantee compatibility. A seller’s explanation should refer to this part and this vehicle. Save the answer with the images so it remains available when you compare another listing.

GOV.UK sources: GOV.UK: Consumer guidance on fake vehicle parts

Send one complete fitment enquiry

The IPO advises buyers who are unsure to seek help from a trusted garage, authorised dealership or parts distributor. It also warns that garages can be cautious about fitting customer-supplied parts. Speak to the person doing the repair before committing to a purchase, including whether they will accept your proposed source.

For the enquiry itself, send the vehicle information, full transcribed marking, photographs and the exact listing under consideration. Ask the supplier to confirm suitability in writing and identify the evidence used. Ask the installer what else is needed to complete the job and whether the listing includes it. This is a suggested communication method, not a promise that a written response guarantees fitment. If the answer only repeats the advert’s broad model range, ask the unresolved question again rather than treating repetition as confirmation.

GOV.UK sources: GOV.UK: Consumer guidance on fake vehicle parts

Separate identity from authenticity

A plausible number is not, by itself, a reason to trust the seller. IPO guidance explains that both manufacturer-branded and aftermarket supply can be affected by counterfeits. Its business guidance links to manufacturer tools for checking authenticity. Use a relevant official manufacturer route where one is available, rather than assuming that a copied logo or printed code settles the question.

Our suggested comparison has two separate answers: “the supplier confirms the specification” and “I understand who is supplying it”. Save the listing, seller identity, receipt and any authenticity response together. Ask what arrives in the box, whether the photographs show the actual item, and what the stated condition means. If the supplier changes during the conversation, repeat the source checks; the evidence collected for one seller should not silently become evidence for another.

GOV.UK sources: GOV.UK: Consumer guidance on fake vehicle parts; GOV.UK: Business guidance on identifying and reporting fake parts

Check for relevant safety recalls

The government recall service covers parts and accessories as well as complete vehicles. Its parts search uses the manufacturer and model. That makes accurate identification useful beyond shopping: it can help you ask whether a safety notice applies to what you are considering. A parts search and a registration-based car recall search answer different questions.

As a practical follow-up, save the wording or reference of a potentially relevant notice and ask the manufacturer whether the proposed item is affected. Do not try to decide an unclear match by comparing only a fragment of the number. If there is an unresolved safety concern, leave the item unfitted while you get advice. The aim of your notes is to make that conversation precise, not to replace a recall decision by the manufacturer.

GOV.UK sources: GOV.UK: Check vehicle, part and accessory recalls

Compare the delivered item before fitting

Roadworthiness remains the driver’s responsibility, and a current MOT does not make every part choice safe. Leave decisions about installation and safety to a competent person where you cannot establish them yourself. Recording a number is preparation for that decision; it is not a repair instruction.

Our arrival check is to place the order confirmation, saved photographs and new item together. Compare the complete reference and the description you agreed, then ask about any unexpected difference before fitting. Keep packaging and records while resolving it. If the part seems fake, preserve photographs and follow the IPO reporting route. For an ordinary supply dispute, the GOV.UK consumer-rights page points to advice services in each UK nation. Explain what was promised, what arrived and what evidence you retained, rather than relying only on “it looks wrong”.

GOV.UK sources: GOV.UK: Check your vehicle is safe to drive; GOV.UK: Business guidance on identifying and reporting fake parts; GOV.UK: Consumer rights and advice services

Sources and review date

Government information checked on 28 September 2026. Mekivo's checklists explain how to use these sources; GOV.UK does not endorse Mekivo or verify marketplace listings. Follow the linked guidance for its scope and any later changes.

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