Most returns in car electronics are not faulty parts. They are the right part for a different car: a TPMS sensor on the wrong frequency, an H7 bulb for a car that takes H11, a Type 2 adapter for a Type 1 inlet. AVT Expert exists to stop that happening. Every product we sell is listed with the exact vehicles it fits, and before you order we will check it against your car's VIN. This article explains what that means and how to use it.
What a VIN is
The Vehicle Identification Number is the 17-character code stamped on every car built since 1981. You will find it at the bottom of the windscreen on the driver's side, on the V5C logbook, on a plate in the door shut or under the bonnet, and in most cars' infotainment system under vehicle information. It never contains the letters I, O or Q, to avoid confusion with 1 and 0.
The code is built in three parts:
- Characters 1–3 (WMI) — the manufacturer and the country or region of manufacture. A VIN starting with W is German-built, SA–SM is British, J is Japanese, 1, 4 or 5 is American, and so on.
- Characters 4–9 (VDS) — the model, body style, engine, transmission and, for many brands, the market the car was built for. This is where the useful detail lives.
- Characters 10–17 (VIS) — model year, assembly plant and the serial number.
Why the VIN matters more than the badge
Two cars with the same name on the boot can be different vehicles as far as parts are concerned:
- Market — a Toyota built for Japan uses 315 MHz TPMS sensors; the same model built for Europe uses 433 MHz. Imported cars are the main reason people buy sensors twice.
- Model year — a facelift often changes the headlamp unit and with it the bulb fitting, or adds a CANbus check that the pre-facelift car did not have.
- Trim and options — the same car can leave the factory with halogen, xenon or LED headlamps, with or without TPMS, with a Type 1 or Type 2 charging inlet depending on year and market.
- Running changes — manufacturers switch suppliers mid-year. A part number can change without the model name or year changing at all.
“Universal” parts try to cover all of this with one product and a long compatibility list. Sometimes they work. Often they fit mechanically and fail electronically, which is the most frustrating kind of failure because it is discovered after the part is fitted.
How we match parts
For every product we stock we hold the manufacturer's fitment data: OE part numbers, the years, makes, models and markets each part covers, and the exceptions (right-hand drive, facelift, trim level). When you send us a VIN we decode it to the exact variant and check the part against that data, not against the model name. If the fitment is ambiguous — for instance a model year where two headlamp units were used — we will tell you what to look at on the car to settle it rather than guess.
What to send us
You can use the contact form, email hello@avtexpert.com, or the fitment note at checkout. The more of these you include, the faster we can confirm:
- VIN (all 17 characters) — or the UK registration number, which lets us look it up.
- The part you are replacing — a photo of the old TPMS sensor, the marking on the old bulb, or the car's charging inlet.
- What you want to achieve — clear a TPMS warning, upgrade dipped beam, charge at a particular charger.
- Anything unusual — imported car, aftermarket wheels, a previous conversion.
We reply within 24 hours, usually much sooner, and we will say plainly if we do not have a part that fits rather than sell you one that nearly does.
About AVT Expert
AVT Expert is operated by LEVITAN TRADING LTD, a company registered in England and Wales (company number 17435550), and sells TPMS sensors, LED headlight bulbs and EV charging adapters to drivers across the UK and Europe. Clear specifications, plain-English installation guides and real people answering fitment questions are the whole point of the business. Browse all parts or ask us a fitment question.