Motornummer | Tecdoc

The TecDoc Motornummer (engine number or engine code) is a critical identifier within the TecDoc Catalogue used to precisely match spare parts to a vehicle's specific engine variant. Because a single car model (like a VW Golf) can have dozens of different engine versions, the Motornummer ensures you don't order a part that physically fits the car but is incompatible with the engine's power output or technical configuration. 1. Where to Find the Motornummer

Vehicle Documents: It is typically listed on your vehicle's registration certificate or V5C logbook.

Physical Inspection: Stamped directly onto the engine block. Locations vary, so consult your owner’s manual for the exact spot.

Service Stickers: Often found in the spare wheel well or on the B-pillar of the car.

Digital Lookup: In the TecDoc Catalogue App, entering a VIN (Vehicle Identification Number) or license plate will often automatically retrieve the corresponding engine code. 2. Using the Motornummer in TecDoc tecdoc motornummer

The Motornummer acts as a primary filter to narrow down thousands of parts to only those that work for you.

Since "TecDoc" is a standard used in the automotive spare parts industry (managed by TecAlliance), the "Motornummer" usually refers to the specific Engine Code used to identify parts.

Here is a guide on how to find, decode, and use TecDoc engine numbers:

5.2 Rebuilt or Restamped Engines

If an engine has been restamped with a non-OEM number, TecDoc will fail to recognize it. User must manually select engine code from a list. The TecDoc Motornummer (engine number or engine code)

B. Serial Number Range Check (Critical!)

This is the most detailed function. Manufacturers often change parts (e.g., head gaskets, timing chains, injectors) within the same engine model after a certain chassis or engine serial number.

TECDoc logic example:

• Engine: VW 1.9 TDI (Engine code ALH)
• Motornummer: ALH 123456
• TECDoc will check if this number is above or below a threshold (e.g., engine serial ALH 400000).
• Resulting part difference:
  • Below 400,000 → Uses 2-hole head gasket.
  • Above 400,000 → Uses 3-hole head gasket.

Without the full Motornummer, TECDoc might show both gaskets, leading to the wrong part selection.

1. Technical Supercessions

Manufacturers change designs mid-production. An engine might use a water pump with a plastic impeller (Part A) for the first two years, then switch to a metal impeller (Part B) without changing the vehicle’s VIN. Only the Engine Code reveals this shift. Engine: VW 1

3. How TecDoc Processes the Motornummer

1. The "Facelift" or "Baujahr" Trap

Two cars with the same VIN prefix (same year, same model) can have a different Motornummer range. For example, the Peugeot DW10 diesel engine underwent a piston ring design change in 2006. Engines with Motornummer below a specific threshold use old rings; above it use new rings. TECDOC knows this; the average eBay seller does not.

3.4 User Interface Example

Typical TecDoc search mask:

Vehicle selection:
  -> Make: [Audi]
  -> Model: [A4]
  -> Type: [B8]
  -> Engine Code / Motornummer: [CNC 123456]

When CNC 123456 is entered, TecDoc recognizes CNC as a valid engine code for the 2.0 TDI 143hp (common rail). It will then present parts only compatible with that exact variant, even if other engines with similar displacement exist.