VW / Audi / Seat / Skoda (VAG) Bosch MA2.1 Engine ECU Repairs

Type: Bosch Engine Management
Fits: VAG – Audi / Seat / Skoda / Volkswagen (VW)
Fuel: Petrol
Ref: ECUT194195

Note: This ECU may also fit other models.

Four Bosch control units share one vehicle-manufacturer part number in the published parts records, and the character that separates them sits at the end of it. This page covers the plain form: Bosch 0261200251, listed against 443 907 311.

Add a B, a C or a D to that number and you have named a different Bosch reference each time. Anyone reading a label that has spent its working life in an engine bay, or searching the base number without its final letter, will be shown all four.

What the parts record pairs with Bosch 0261200251

Eleven independent parts operations print Bosch 0261200251 and 443 907 311 in the same listing, in several countries and several languages. That agreement is what the single row in the table at the foot of this page records, and it is the pairing to work from. The MA2.1 listing on this site carries that one Bosch reference.

The car these listings name

Thirteen independent operations name the Audi 80 alongside Bosch 0261200251 — more corroboration, counted independently of the part-number pairing, than the pairing itself carries. Several of them give the generation as the B3, also written as type 89, and several give the engine as the 1.8 petrol. A small number widen the description to the 80 and 90 of the same period.

That is the whole of what the public record settles for this reference, so it is the whole of what this page states. No source gives a production span — the listings are dated one donor car at a time — and the records disagree with each other on the engine’s output, so neither a year range nor a power figure is repeated here.

If the unit in front of you turns out to be a different Audi reference, the Audi engine ECU numbers we have pages for are listed in one place.

The three references that are not this unit

443 907 311 B is Bosch 0261200261. 443 907 311 C is Bosch 0261200273. 443 907 311 D is Bosch 0261200271. Three operations pair the B with its Bosch number, two pair the D, and one pairs the C — thinner corroboration than the plain form carries, but consistent, and enough to show that each letter belongs to a Bosch reference of its own.

None of the three is the unit this page covers, and none of them appears in the list at the foot of it. What they share with it is nine digits of a vehicle-manufacturer number, which is the part of the string that identifies nothing on its own.

Why a parts search will not separate them for you

Public parts catalogues index on the base number. Search 443 907 311 and the results come back mixed, because to a catalogue built that way the four are variations of a single entry rather than four separate control units. The suffix is doing all of the identifying work, and it is the part of the number most easily lost — worn off a label, or left off a listing by whoever typed it in.

So the first useful step is to read the whole string off the case rather than the part of it you recognise, and then to pass it on in full. The nine digits narrow the field to four. The letter, or the plain form, is what closes it.

If the base number on your unit is not 443 907 311 at all, it may belong to another designation altogether — Bosch MA1.3 covers a different set of references.

What the repair involves

Every unit is repaired in-house, by our own engineers, in our own UK workshop — nothing is subcontracted and nothing is processed overseas. Each one is logged in, inspected visually, tested electrically and then taken through fault-specific diagnostics, so the work is aimed at the failure the board actually has rather than at a general overhaul.

The repair itself is carried out at component level: we find and replace what has failed on the board rather than exchanging the whole unit. On a reference this easy to confuse that is worth something in itself, because the control unit that goes back into the car is the one that came out of it, and nothing has to be matched to anything. Component-level work is done under a microscope with temperature-controlled rework equipment, and a repair is not finished until it has passed final testing.

Repairs are covered by a 24-month warranty on the specific repair carried out. Before any of that, the unit is tested and diagnosed and we come back to you with what we have found and what it will cost; no chargeable work starts without your authorisation.

Engine ECUs, ECMs and PCMs are the whole of what we take on, across the marques we repair engine ECUs for.

Sending a unit in

The service is mail-in and covers the whole of the UK. Send the unit packed so it cannot move in transit, and send the numbers with it: the ten-digit Bosch reference and the vehicle-manufacturer number in full, including any letter on the end of it.

If the letter has worn away, or you cannot tell one character from another on a label that age, say so rather than guessing. An uncertain reading you have flagged is more use to us than a confident one that turns out to belong to a different unit.

Quote the whole reference on the Repair Form and we will confirm whether it is a unit we cover before you send anything.

The part numbers associated with this type of unit are listed below.

Common part numbers associated with this type of unit