UK parts guide

How to check whether a car part fits

By Mekivo · Updated

Compatibility is a question about a particular replacement and a particular vehicle. A listing can contain the right model name and still leave important questions unanswered. The aim of this guide is to help you gather those answers, keep track of their source and recognise when you need a supplier, manufacturer or qualified garage to decide.

GOV.UK supports the official safety and consumer information linked below. It is not a technical fitment catalogue. The comparison method is Mekivo's practical workflow, not government approval of a product. Mekivo does not certify part numbers, manufacturer substitutions or the suitability of marketplace listings. A generic illustration can help name a component but cannot settle these questions.

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Separate vehicle identity, product identity and seller claims

Create three short notes: what is known about your vehicle, which item is being offered, and what the seller says connects the two. GOV.UK's counterfeit-parts guidance highlights that the same model and year can require different parts. That makes a broad model match a starting point for questions rather than a completed compatibility check.

Keep facts and assumptions separate. A registration copied from your documents belongs in the first note; a number copied from a listing belongs in the second; an answer from the supplier belongs in the third. Where information conflicts, ask which record the answer relies on. Do not resolve a contradiction by selecting whichever detail makes the cheaper item appear suitable.

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

Check the vehicle details and disclose known changes

Use the DVLA enquiry service to cross-check recorded vehicle information, then give the supplier any further details it requests. Keep a record of known changes rather than assuming the car remains exactly as originally supplied. Ask the garage which changes matter to the proposed repair; a registration lookup alone cannot answer every question about the vehicle in front of it.

DVLA requires evidence for certain changes to registration details, including engine number or capacity changes. Its guidance lists acceptable evidence and separate requirements for structural changes. If your project involves those areas, read that guidance before ordering and keep the relevant records. Ordinary replacement shopping should not be confused with a decision about vehicle registration or approval.

GOV.UK sources: GOV.UK: Get vehicle information from DVLA; GOV.UK: Evidence for changing vehicle registration details

Ask the supplier to explain reference numbers

Copy the reference from the proposed item and compare it with the information supplied by your garage or manufacturer. If they differ, ask for a written explanation tied to your vehicle and that exact product. If a seller says one number replaces another, request the manufacturer or catalogue evidence behind the claim. Do not infer a substitution from similar numbering.

Keep photographs of labels alongside the text so that someone checking the enquiry can see what you copied. Ask about unreadable characters rather than filling them in. The official counterfeit-parts advice recommends expert help where uncertainty remains; it does not provide a rule that any particular prefix, suffix or stamped marking proves compatibility. Treat those details as evidence to investigate, not a universal code you can decode yourself.

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

Read exclusions and confirm what will arrive

Read the whole original listing, including notes beneath a compatibility table. Ask the seller to address any exclusion that might apply to your vehicle. Confirm the exact product, stated condition, quantity and included items rather than relying on the title alone. A conversation about a similar product is not confirmation of the item in your basket.

GOV.UK's distance-selling guidance explains the information a relevant business seller must provide, including a product description, price and delivery arrangements. Use the order record to capture those details. A practical message is: these are my vehicle details, this is your listing reference, and this is the point I need you to confirm. Keep the response attached to that order rather than a separate, unlabelled screenshot.

GOV.UK sources: GOV.UK: Online and distance selling

Check safety information as well as the fitment answer

A supplier's compatibility answer does not replace a recall check. GOV.UK lets you search recalls for components and accessories using the manufacturer and model. If the result appears relevant, ask the manufacturer whether the actual product or batch is affected. Keep any instructions with the purchase record.

Separate the questions you are asking. One concerns whether the product is intended for your vehicle; another concerns whether the supplied item is affected by a known safety problem. If you cannot identify the product well enough to ask either question, resolve that gap before fitting it. Do not treat the absence of an obvious result as a certificate that the item is authentic or safe.

GOV.UK sources: GOV.UK: Check if a vehicle, part or accessory has been recalled

Have differences resolved before fitting

When the item arrives, compare it with the order confirmation and ask the fitter to review it before installation. Photographs, dimensions and visible connections can help explain a concern, but this guide does not give a technical pass or fail rule for them. Do not force, alter or dismantle a questionable item to make the purchase seem workable.

Ask who will confirm suitability and whether any additional work or checks are included in the fitting quotation. GOV.UK says a vehicle can be unsafe even with a valid MOT; an MOT should therefore not be used to settle a question about a proposed replacement. If the fitter and seller disagree, pause the job and obtain a clear explanation rather than passing the uncertainty between them.

GOV.UK sources: GOV.UK: Check your vehicle is safe to drive

Keep cancellation, mismatch and fault questions separate

If the delivered item differs from the order or the seller's written description, document the difference and contact the seller promptly. Describe what you received and the remedy you are asking for. Do not simply label every problem as a change of mind: the facts of the purchase matter.

GOV.UK distinguishes cancellation of qualifying distance purchases from remedies for faulty or misdescribed goods. It also explains that business sellers cannot remove statutory consumer rights through a blanket no-refunds policy. Read the guidance applicable to your purchase and get consumer advice if necessary. Keep packaging and avoid unnecessary handling while you establish what to do; a seller's return procedure does not itself prove that the part was compatible.

GOV.UK sources: GOV.UK: Accepting returns and giving refunds; GOV.UK: Consumer rights and advice

Keep a record that another person can follow

Store the vehicle details used for the check, the precise product reference, original listing, invoice and supplier confirmation together. Add the fitting invoice and any explanation of a replacement or changed product. This creates a useful record for a future garage visit without needing to reconstruct the decision from search history.

For a serious safety defect, GOV.UK advises reporting it to the manufacturer immediately and contacting DVSA if you are unhappy with the response. Its reporting process asks for vehicle details and information about what happened. Keep observations factual and retain photographs where available. A good compatibility decision has a traceable basis; an unresolved claim should remain a question, even after a parcel has arrived.

GOV.UK sources: GOV.UK: Report a serious vehicle safety defect

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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