How to read hardware and software numbers from an ECU label
The hardware number, software number and manufacturer part number are the three keys to finding a compatible file. Here is where to find each one on Bosch, Delphi, Continental and Denso units.
Why the numbers matter
A file only works if it was read from an ECU with the same hardware and the same software calibration. Two cars with the same engine can carry completely different software, and writing the wrong one is the fastest way to a non-starting vehicle.
Bosch (EDC16 / EDC17 / MED17 / MD1 / MG1)
- Hardware number — starts with
0281(diesel) or0261(petrol), e.g.0281017946. - Software number — starts with
1037, e.g.1037541778. It is printed on the label of older units; on newer ones read it with your tool. - Manufacturer part number — e.g.
03L906018JJon VAG.
Delphi (DCM3.x / DCM6.x)
Look for the Delphi part number (28xxxxxx) and the vehicle part number (for Mercedes, A651…). The software is identified by the calibration string read over OBD.
Continental / Siemens (SID / PCR / Simos)
The label shows the Continental number (5WS40…, S180…) and the vehicle part number. The software version is best taken from a read-out.
Denso
Denso labels carry the 275700-xxxx or MB275700-xxxx number along with the vehicle part number (e.g. 89663-0K580 on Toyota).
Tip
When in doubt, read the ECU identification with your tool first and paste the numbers into the ECU lookup — we match on every number, with or without spaces and dashes.