0AM Part Number Dictionary: Learn to Read DQ200 Mechatronic Codes

Dozens of different numbers circulate for the DQ200 mechatronic unit: 0AM 927 769, 0AM 325 066, 0AM 325 587… Most lists online simply list these numbers one after another and assign a “meaning” to every letter. In fact, the letters have no fixed technical meaning on their own. Instead of a list to memorise, this guide gives you the logic you need to read the number yourself, then brings everything together with a searchable dictionary and an interactive map of the mechatronic unit.

01 — STRUCTUREHow to read a number

Volkswagen Group part numbers follow the same skeleton. The first three characters identify the vehicle or unit the part belongs to (here 0AM = DQ200 transmission), the fourth digit is the main group, the next two digits the subgroup, the last three digits the part itself, and the final letter(s) the revision index. Hover over or tap the segments in the decoder below:

Seen this way, it is immediately clear that numbers starting with 0AM 325 … belong to the hydraulic control side and those starting with 0AM 927 … to the electronic control side. This distinction alone halves the search when you look for a part in a catalogue.

02 — REVISIONWhat the letter suffix tells you

The letter shows which revision of the part it is. When the manufacturer changes the material, dimensions, production method or software, it moves to the next letter:E → F → G. When the letters run out, two-letter indices such as AA, AC, AE follow.

Rather than reading guessed meanings into the letters, it is enough to know this: a different letter means a different revision. The VIN tells you which one fits your car.

03 — MAPA map of the mechatronic unit

Seeing what the numbers correspond to sticks far better than memorising them. Tap a layer in the exploded view below; the component’s function and its part numbers open on the right.

04 — DICTIONARYSearchable code dictionary

You can type your number with or without spaces; the dictionary recognises both. The copy button puts the number on your clipboard without spaces, ready for a catalogue search.

05 — RULES5 rules for choosing the right part

1. 1VIN firstThe label on the part may have been changed or become unreadable. The only reliable source for an exact fit is a catalogue query using the VIN.
2. 2Don’t ignore the letterDifferent letters of the same base number can mean different software, dimensions or materials. A different letter does not mean ‘almost the same’ — it means ‘a different revision’.
3. 3The new one replaces the old, not the other way roundFor mechanical parts the manufacturer usually lists the newer revision as a replacement for the older one. Fitting an older revision to a newer system is risky.
4. 4Software-based parts must be codedA mechatronic control unit does not work correctly until it has been matched to the vehicle’s software and VIN; the basic settings must be run after replacement.
5. 5Choose the part by the cause of the faultIn the case of pressure loss, renewing the accumulator and the seals is often enough; a complete mechatronic unit is rarely needed. The right diagnosis leads to the right number.

06 — MISTAKESCommon mistakes

If you have found your number and are looking for its equivalent: see the Volwant reinforced accumulator for the accumulator, the mechatronic valve body for the valve body, the mechatronic repair kit for renewing gaskets and O-rings, and the K1 K2 piston repair kit for the clutch side. If you are experiencing pressure loss, our P17BF and P189C guide will help too.

07 — FAQFrequently asked questions

The numbers are compiled from publicly available catalogue and supply records; manufacturer revisions may change over time. Send us your VIN and we will tell you which number fits your car.