The most reliable way to choose the right engine ECU is by part number. Two ECUs that look almost identical may have different hardware or software versions. In this guide, we explain what the numbers on the label mean and what should be compared before ordering.<\/p>\n
An engine ECU label usually carries three types of numbers:<\/p>\n
For a compatibility check, at least two numbers should match, preferably the hardware number and the vehicle manufacturer's number.<\/p>\n
On Bosch ECUs, the hardware number has 10 digits and is usually written with spaces. 0 281 xxx xxx<\/strong> numbers are mostly diesel (EDC family) ECUs, while 0 261 xxx xxx<\/strong> numbers are gasoline (ME\/MED family) engine ECUs. Software numbers usually have 1037<\/strong> as their prefix. In searches, the spaced (0 281 017 453) and unspaced (0281017453) forms refer to the same product.<\/p>\n Siemens VDO and Continental ECUs carry 5WS<\/strong>, 5WK<\/strong>, S11\u2026<\/strong> or S18\u2026<\/strong> numbers, as well as SID<\/strong>, SIM<\/strong>, EMS<\/strong> family names. Newer models also use A2C<\/strong> series Continental numbers.<\/p>\n Delphi ECUs commonly have 28xxxxxx<\/strong> format eight-digit numbers and the DCM<\/strong> family name. On Magneti Marelli ECUs, the IAW<\/strong> (gasoline) or MJD<\/strong> (diesel) family names are the most common.<\/p>\n You can go directly to the relevant product by typing the part number, with or without spaces, into the search box on our site. For all options, see our engine ECU products<\/a> to see what's available.<\/p>\n The number is printed on the label on the ECU housing. The label is usually on the top of the housing, and on some models on the connector side. If the label is unreadable, you can take a photo and send it to us.<\/p>\n Yes. Two ECUs with the same hardware number may carry different software versions. That is why the vehicle manufacturer's number should also be compared.<\/p>\n If the numbers do not match, the ECU should not be assumed to be compatible with the vehicle. An ECU with a different number may not work or may trigger warning lights.<\/p>\nSiemens \/ Continental label<\/h2>\n
Delphi and Magneti Marelli label<\/h2>\n
Vehicle manufacturer numbers<\/h2>\n
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Pre-order checklist<\/h2>\n
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FAQ<\/h2>\n
Where is the part number on an engine ECU?<\/h3>\n
If the hardware number is the same, can the software be different?<\/h3>\n
Can the ECU be installed if the part number does not match?<\/h3>\n