The MSS50 is a special ECU designed solely for the European E36 M3 3.2. The OBD2 P codes fault protocol was not activated in European markets on this group, as currently it was not required MS42 on the M52TU series, and MS43 on the M54'S. The MS41 was used on the M52 series of engines, This includes CatalyticĬonverter monitoring and Long / Short term Fueling and Ignition Adaptation. The next generation Siemens MS ECUs introduced many of the OBD2 features. MS40.0 is a rare ECU used on non VANOS 2.0l, and MS40.1 introduced VANOS control. M50 24v engines and used Siemens for some of the 2.0 litres, and Bosch continued on with the 2.5l. MS40 was a new ECU for BMW, manufactured by Siemens instead of the previous Bosch Motronics. M50 engines with VANOS, introduced to the E34 and E36 in 1992.

M3.3.1 included VANOS control, and is used on Used to run the later 3.8 litre S38b38, the S50 3.0 M3, and the M60 V8s. The M3.1 is a 6cyl ECU, used on the early M50 24v engines without VANOS. M1.7.2 was used for the M42 and M43 4 Cylinders. Was used solely for the S70, used in the BMW 850CSi. The M1.7 was used on the M40, M42 and M70, the M1.7.1 The Motronic 1.7 and subfamilies, and the M3 and it's variants are the next generation of BMW ECUs. M1.1 and M1.3 was used on the M20, M30 and M40 engines, whilst M1.2 was used on the S38 and M70, which are the early E34 M5 engines and the early V12s.īMW DME M1.7, M1.7.1, M1.7.2, M3.1 and M3.3 The BMW DME M1.1 (and similar, 1.2 and 1.3) is an early Bosch Motronic ECU, used on all of the 6 Cylinder BMWs up until 1990, and a few more after that. If you have a Hex code from your scan tool, but need to find it in a Decimal list, use the Converter below. Clicking the titles of the descriptionsĪll codes from DDE4 onwards are listed as the HEX value. To search for your code, follow the list below, or press ctrl+f to search within this page. Make sure you are looking at the correct system, sometimes a code reader will convert to decimal (our normal 0-10 system) and it may be confusing. This means if you see an '11', it could be TheĮxtra 'numbers' in hex are A,B,C,D,E and F. Hex format is a hexadecimal number, used by computers to count in base 16, so there are 16 numbers before '10', instead of our ten. The code reader or diagnostic tool will ask the module for any stored codes, and it will receive a number in hex format. This is because many fault code tables, like our OBD code listĪre showing the OBD2 generic codes. You don't recognise, or one that doesn't appear in a search. If you are reading codes from specific BMW modules, you may find you get a code

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