How to Identify a Car Part With No Number (UK Guide)
It happens to everyone eventually: you've got the broken part in your hand but the number has worn away, flaked off, or was never there to begin with. Don't panic. With a methodical approach using photos, measurements and your VIN, almost any part can be identified and matched. Here's how to do it properly.
Start with the VIN
Your Vehicle Identification Number is the master key. It's a 17-character code found on the dashboard at the base of the windscreen, on a plate in the door shut, and on your V5C logbook. The VIN tells a parts catalogue your exact make, model, year, engine and often the trim and build options, which narrows the search dramatically before you've even looked at the part itself.
Identify your vehicle first in our shop by make hub, then drill down to the right model and year. Half the work of identifying a part is simply confirming the exact car it came from.
Photograph the part properly
Good photos are the difference between a confident match and a guess. Clean the part first, then shoot it on a plain background in even light.
- Multiple angles — front, back, both sides and any mounting faces.
- A scale reference — place a tape measure or ruler in shot.
- Connectors and fixings — close-ups of plugs, pins, threads and clips.
- Any markings — faint casting numbers, logos or moulded text under good light.
Even a worn part often carries a casting number, a supplier logo or a partial code that a specialist can read when you can't. Angle a torch across the surface to throw shadows that make faint markings legible.
Measure everything that matters
Numbers turn a vague description into a precise specification. For a bracket or panel, record overall dimensions and hole spacing. For electrical parts, note the number of pins and the connector shape. For seals and bushes, measure internal and external diameter and thickness. A set of digital callipers is well worth owning, but a steel rule and a bit of care will get you most of the way.
- Length, width and depth of the part.
- Hole or stud spacing centre to centre.
- Pin count and connector type for electrical items.
- Inner and outer diameters for round components.
Use forums and owners' clubs
The collective knowledge of an owners' forum is hard to beat. Post your clear photos, your VIN-confirmed model and year, and your measurements, and ask the simple question: "what is this and what's the part number?" Enthusiasts who know your model will often recognise it instantly, tell you what it interchanges with, and point you to a supplier. Be specific and polite, and include the context of what the part does on the car.
Cross-reference once you have a number
The moment someone gives you an OE part number, your options open right up. Cross-reference it for superseded numbers and aftermarket equivalents, since a single part was often shared across models and badges. What looked unobtainable frequently turns out to be a current, in-stock item under a different reference.
A quick identification checklist
- Find and note your 17-character VIN
- Clean the part and photograph it from every angle with a scale
- Record all key measurements and connector details
- Check the part for faint casting or supplier markings
- Post to the relevant forum or club with full details
- Cross-reference any number you find before buying
Let us identify it for you
If you'd rather hand the puzzle over, that's exactly what our request-a-part service does. Send your VIN, clear photos and measurements, and we'll work to identify the component and match a genuine, superseded or aftermarket equivalent. For older or unusual vehicles, our classic and vintage car parts collection is a sensible starting point. Tracked UK delivery is standard, and code SAVE10 gives you 10% off once we've found the right part.
Frequently asked questions
- Where do I find my car's VIN in the UK?
- Look at the base of the windscreen on the dashboard, on a plate in the driver's door shut, and on your V5C logbook. The 17-character VIN confirms your exact model, year and engine.
- What photos help identify an unmarked car part?
- Take clear shots from every angle on a plain background with a ruler for scale, plus close-ups of connectors, threads and any faint casting marks. Angle a torch across the surface to reveal worn markings.
- Can you identify a part if I have no part number at all?
- Yes. Send your VIN, clear photos and measurements to our request-a-part service and we'll work to identify the component and match a genuine or aftermarket equivalent.