Audi A2 Engine ECU Repair: 1.4, 1.6 FSI, 1.4 TDI and 1.2 TDI

This page is about the engine ECU in the Audi A2: the control unit that runs the 1.4 petrol, the 1.6 FSI, the 1.4 TDI or the 1.2 TDI, and how to tell from its label which family yours belongs to. It once described the control unit built into the A2’s ABS pump, which is a different unit from the engine ECU and not one we repair.

The engine side is our work, carried out in-house at component level. On the A2 the route to the right unit is short: four engines, three engine ECU families we can name, one unit we identify only once it reaches us, and a first split that comes from nothing more technical than the fuel the car takes.

Diesel or petrol: the split that names the maker

Start with the fuel. Both A2 diesels, the 1.4 TDI and the 1.2 TDI, use a Bosch engine ECU, and the records we work from place both on the Bosch EDC15P+ family. The 1.4 petrol, the multi-point injection engine, uses a Magneti Marelli unit instead.

The 1.6 FSI is where the split stops working. It is a petrol engine, but the fuel does not name the maker: its unit is recorded as 036 906 013 F on the BAD engine, and the public record does not establish a maker or family for it to the standard every claim on this page is held to. So we do not name one. Our technical team confirms that unit from the details you send and from the unit itself, rather than guessing.

The 1.4 petrol: one base number, two Marelli families

Each of the three 1.4 petrol numbers covered here begins 036 906 034, and the letters after that base decide which Magneti Marelli family the unit belongs to:

• 036 906 034 Q — IAW 4LV, recorded on the AUA engine.
• 036 906 034 CA — IAW 4MV, recorded on the BBY engine.
• 036 906 034 EG — IAW 4MV.

The base number on its own cannot tell a 4LV from a 4MV; the suffix does that. The engine code is a useful cross-check on the 4MV side, because the BBY engine runs a 4MV: a BBY car whose unit reads 036 906 034 CA agrees with itself all the way through.

A label ending in Q belongs with Magneti Marelli IAW 4LV. One ending in CA or EG belongs with Marelli’s 4MV. The 4LV page carries the Q in its list, and the 4MV page carries both the CA and the EG.

The 1.4 TDI and 1.2 TDI: Bosch units on a shared base

The diesels share a base as well. Every A2 diesel number below begins 045 906 019, so the base will not separate a 1.4 TDI from a 1.2 TDI; the letters after it will. Most of these units also have a ten-digit Bosch number beginning 0 281 recorded against them, which is worth reading alongside the Audi number.

Records place the 1.4 TDI on Bosch EDC15P+, and of its individual numbers the G is the one confirmed as EDC15P+ in its own right. The AT and the F are Bosch units, with the Bosch numbers shown. The BA is recorded on the A2 1.4 TDI and we state nothing more about it than that.

The G, the AT and the F all appear on our page for Bosch EDC15P+ diesel units, so a label reading any of the three has somewhere to go. The 1.2 TDI’s 045 906 019 D is an EDC15P+ as well, Bosch 0 281 010 227, and it shares its base with the 1.4 TDI units, which is the reason to quote that D in full rather than the base alone.

Three A2 numbers without a family page

Three numbers on this page have no family page of their own on the site: the 1.6 FSI’s 036 906 013 F, the 1.4 TDI’s 045 906 019 BA and the 1.2 TDI’s 045 906 019 D. None of them is a dead end. Send the details on the Repair Form instead, and our technical team confirms coverage for that specific unit rather than guessing.

The same goes for a number that does not appear here at all. If the unit came out of any other Audi, the Audi page is the better place to start; for a unit from outside the Audi range, begin at the main engine ECU page.

Sending an A2 engine ECU to our workshop

We run a mail-in service across the whole UK, so the car stays where it is and only the control unit travels. Every unit is repaired in our own UK workshop by our own engineers: logged, visually inspected and electrically tested, then taken through fault-specific diagnostics, with the component-level work carried out under a microscope.

We repair the specific fault rather than swapping the whole unit, and a repair is not complete until it passes final testing. Once the unit has been diagnosed, we contact you with the outcome, and no chargeable work begins without your authorisation. The repair carried out is covered by our 24-month warranty.

To begin, open the Repair Form — the enquiry form on our contact page — and give us three things: the Audi number from the label, the second number printed beside it where there is one, and the engine (1.4 petrol, 1.6 FSI, 1.4 TDI or 1.2 TDI), with its engine code if you have it. That is what our engineers need to place an A2 unit before it travels.