Bosch DME M 1.7.3 Engine ECU Repairs

Type: Bosch Engine Management
Fits: BMW 316i / 318i / Z3
Engines: E36
Year: 1994 – 1999
Ref: ECUT312195

Note: This ECU may also fit other models.

The two Bosch DME M1.7.3 units on this page are told apart by one fact about the car: whether it is a 316i. An E36 316i points to 0 261 203 660, while an E36 318i or a Z3 points to 0 261 203 661. The two numbers printed on the DME case then confirm which unit you actually have.

Two units, one engine, divided by model

Both references are recorded against BMW’s M43 four-cylinder engine, so knowing the engine does not choose between them. The dividing line falls between models instead.

The first, 0 261 203 660, paired with BMW number 1739855, is documented against the E36 316i. The second, 0 261 203 661, paired with 1432519, is documented against the E36 318i and the Z3. The sort therefore needs only one answer: a 316i leads to the first row, and either of the other two cars leads to the second.

Z3 owners: your row is the 318i’s

The spec lines at the top of this page open with two 3 Series badges, and the Engines line reads E36, so a Z3 owner could fairly wonder whether this is the right page. It is. The Z3 is named on the Fits line, and it is documented against 0 261 203 661 with BMW number 1432519, the same pairing recorded for the E36 318i.

We have not attributed the 316i’s row to the Z3. If the case on your Z3 carries something other than 0 261 203 661, quote what it actually shows rather than what you expected to find; our technical team confirms coverage for the specific unit, not for the car it came from.

Checking the case before it is posted

The model points to a row; the case confirms it. Each unit here carries two numbers on its label, Bosch’s own and BMW’s, and both should be quoted exactly as printed.

The pairings are consistent in the sources we checked: 1739855 appears with 0 261 203 660, 1432519 with 0 261 203 661, and neither BMW number turns up beside the other Bosch number. Two numbers that match the same row are a firm identification. A pair that matches neither row is worth raising with us before anything is packed.

Give us the model as well. Where badge and label seem to disagree, the label describes the unit in your hand, and the badge describes the car; it is the unit we repair.

Inside our workshop: test, quote, repair

The DME is repaired in-house by our own engineers, in our UK workshop and on our own equipment. It is logged and visually inspected first, then tested electrically and taken through diagnostics aimed at the symptoms you described.

When the fault is traced, we tell you what we found and quote for the repair. Nothing chargeable starts until you give the go-ahead.

The repair is carried out at component level: the failed parts on the circuit board are dealt with under a microscope, using temperature-controlled rework equipment, and your original DME is what comes back. Before it leaves, it has to pass final testing, and the specific repair is covered by our 24-month warranty.

Sending your M1.7.3 in

We work by post and take units from anywhere in the UK. Before the parcel goes, put the answer, and the label, on the Repair Form: whether the car is a 316i, a 318i or a Z3, both numbers from the case, and a short description of the fault.

If the case names a DME other than M1.7.3, look for it where BMW’s other engine units are kept. For a car of another make, start from the page that lists them all.

Both references are set out below, each Bosch number beside its BMW partner, for a line-by-line check against your case.

Common part numbers associated with this type of unit