If two companies in the automotive aftermarket can talk about the exact same part without ever meeting, there's a good chance TecDoc is behind it. TecDoc is the common language of the aftermarket: it holds which part fits which vehicle, which original code it corresponds to, and its technical attributes — all in a standard structure. This guide explains what TecDoc is, the data layers inside it, and how to make your own data TecDoc-compliant.
What is TecDoc?
TecDoc is the global data standard of the automotive spare-parts (aftermarket) industry, maintained by TecAlliance. Its purpose is simple but its impact is huge: to link a part with the right vehicle, the right original (OE) code and the right technical attributes under one standard. Parts manufacturers prepare their data in this standard; catalogs, marketplaces and B4B/B2B platforms consume it. So the answer to "does this brake pad fit this car?" rests on data, not intuition.
The data layers inside TecDoc
What makes TecDoc powerful is that it's not a single list but a set of interconnected data layers. Making a part record truly "TecDoc-compliant" means filling these layers correctly:
- Vehicle database (K-Type): Every vehicle type is identified by a unique K-Type number — with make, model, engine code, production year and technical distinctions. Not just "BMW 320i," but exactly which engine/spec variant.
- Part / product data: Part number, manufacturer brand, and place in the category tree (brakes, filters, suspension…).
- OE (original) numbers & cross-reference: The original-equipment codes the part corresponds to. This is the basis of finding alternatives: pulling all equivalents from one OE code.
- Criteria / technical attributes: Standard properties like dimensions, connection type, number of holes, diameter. The details that separate two same-named parts live here.
- Linkage: The "which part fits which vehicle" relationship. TecDoc's real value is the accuracy of these part-to-K-Type links.
- Images, documents and fitting info: Product photo, technical drawing, fitting note — for sales and correct use.
What is TecDoc used for? Use cases
- Finding parts by vehicle: The dealer selects the vehicle (plate/VIN/K-Type) and sees every fitting part — eliminating the wrong-part risk.
- Finding alternatives from OE: Starting from the original code, it lists all equivalent parts; offering the customer alternatives and price options.
- B4B / e-commerce search: An accurate, filterable catalog experience that ends the pre-order "does it fit?" phone calls.
- Marketplace feeds: Publishing products to TecDoc-based marketplaces and catalogs with standard data.
Why is TecDoc so critical in spare parts?
Because the industry's most expensive mistake is the wrong part. A wrong part means return logistics, lost time, a disappointed customer and damaged trust. Matching hundreds of thousands of parts against tens of thousands of vehicle variants by hand is both slow and error-prone. Clean, TecDoc-compliant data instead:
- Significantly reduces wrong-part returns.
- Lets dealers find the right part on their own (lower phone load).
- Increases conversion in B4B and marketplace sales.
Making your own data TecDoc-compliant
Most companies say "we already have a product list"; but TecDoc compliance requires far more than a list. A typical transformation runs like this:
- Data audit: Existing data is reviewed — missing fields, duplicate records and inconsistent codes are identified.
- Part-number standardization: Codes in different formats are de-duplicated and brought to standard.
- OE matching: Each part is linked to its original codes (semi-automatic algorithm + expert verification).
- Filling criteria: Technical attributes are entered into standard fields.
- Vehicle linkage: Parts are matched to the K-Type vehicle types they fit — the most valuable and hardest step.
- Images & documents: Photos and technical documents are added.
- Continuous updates: As new vehicles and parts arrive, the data is kept live — TecDoc is not a one-off task; it requires continuity.
Common data mistakes
- Not defining the vehicle specifically enough (rough model name instead of K-Type) → wrong matches.
- Entering OE codes incompletely/incorrectly → cross-reference search collapses.
- Leaving criteria empty → inability to tell apart identical-looking parts.
- Preparing data once and never updating → error rate rising over time.
Who is it for?
TecDoc-compliant data is decisive for parts manufacturers (to present data to the market correctly), distributors (to manage a broad catalog), dealers (to find the right part fast) and marketplace sellers (for standard feeds).
The Vilyonix approach
Vilyonix's TecDoc & Data Services cleans and enriches your scattered spare-parts data end to end — from audit through OE matching, criteria filling and vehicle linkage. We do the matching with a semi-automatic algorithm + expert verification, delivering both speed and accuracy. The result is a sales-ready catalog you can push directly to your B4B platform and ERP.