VW / Audi / Seat / Skoda (VAG) Siemens Simos 7.1 Engine ECU Repairs

Type: Siemens
Fits: VAG – Audi / Seat / Skoda / Volkswagen (VW)
Fuel: Petrol
Ref: ECUT219195

Note: This ECU may also fit other models.

Every Siemens Simos 7.1 engine ECU on this page has the same maker, the same fuel, the same engine size and the same base number. There are seven of them, all from 1.6 petrol cars, and every one carries a Volkswagen part number beginning 06A 906 033. The two letters at the end of that number, read with the car the unit came from, are what tell them apart.

Simos is a family of Siemens engine ECUs, and the 7.1 units covered here are repaired at component level by our engineers in the UK. Below, each shared feature is taken in turn: what it confirms, what it cannot settle, and then what does.

What all seven Simos 7.1 units share

Start with the maker. Siemens is the maker on every unit here, so the maker’s name separates none of them.

Fuel and engine size come next. All seven are petrol units from 1.6 engines. A diesel, or a petrol car of another size, is outside this list; a 1.6 petrol car keeps you on it, with all seven units still in play.

Then the base. 06A 906 033 opens every Volkswagen part number on this page, which makes it the strongest sign that you have the right page and no help at all in choosing between the seven. If the number on your label starts any other way, the unit is not one of those listed here.

Each of these checks is worth making before a unit is posted, because each can rule a unit out. None of them can rule one in.

The two letters that separate them

After 06A 906 033, each unit carries a two-letter suffix, and on this page the suffix is the only part of the number that changes. Set against the cars they are recorded in, the seven read as follows:

• 06A 906 033 CG — Volkswagen Touran 1.6
• 06A 906 033 DR — Volkswagen Touran 1.6
• 06A 906 033 KR — Volkswagen Touran 1.6, with the BSE engine
• 06A 906 033 DS — Audi A3 1.6
• 06A 906 033 EH — Audi A3 1.6 of the 8P generation, with the BSE engine
• 06A 906 033 GQ — Audi A3 1.6
• 06A 906 033 HE — Seat Leon 1.6, also recorded in the Seat Altea

How far the car narrows it

Naming the car is one more shared feature, only a narrower one. On a Seat Leon 1.6 it settles the question for this page: HE is the only reference here recorded in the Leon, and the same reference is also recorded in the Seat Altea. If a Leon or Altea label shows a different number, start with the Seat references other than HE.

On a Touran or an A3 the car narrows seven to three. The Touran’s are CG, DR and KR; the A3’s are DS, EH and GQ. Three units in one car is the same pattern as seven on one base, a level further down: the car confirms the group, and the suffix picks the unit.

The engine code does not break the tie. BSE is recorded on KR in the Touran and on EH in the A3, so the code is shared across two cars and cannot pick out a unit by itself. For the other five units, the records we accept stop at the car and the engine size, so knowing a Touran has the BSE engine does not rule out CG or DR.

A Touran with a number other than CG, DR or KR may carry a different engine ECU altogether; work back from the Volkswagen end to find it. An A3 showing anything other than DS, EH or GQ is in the same position, and we set out the other Audi possibilities separately.

None of this is a licence to swap. Seven units on one base, or three in one car, is a record of where each has been documented, not grounds for fitting one in place of another. Each Simos 7.1 is identified from its own label, and the repair is carried out on that unit alone.

Sending a Simos 7.1 in for repair

Our engineers work on engine ECUs and no other kind of control module, and each Simos 7.1 is repaired in-house. A unit is logged and inspected when it arrives, tested electrically, and then diagnosed for the fault it actually has.

The repair is made at component level, under a microscope and with temperature-controlled rework equipment. Every repaired unit goes through final testing before it is returned.

Once the diagnosis is complete we contact you with the findings and a quote, and no chargeable work starts until you approve it. The repair carries a 24-month warranty.

The service runs by post for owners and garages anywhere in the UK. Before anything is posted, copy those last two letters into the Repair Form together with the full part number, the car and its engine size. If the car is not a Volkswagen, Audi or Seat, go up a level to engine ECU repair instead.

All seven references described above are in the table below, with the full part number on each row.

Common part numbers associated with this type of unit