W203 ecu swap. I’m wondering what electronic components are going to need to be swapped over. You'll have to confirm with him whether or not his is an EVO Help with w203 2001 C240 - ECU replacement Thread Rating: 35 Vote (s) - 3. ECU swap is a certainty, and the engine harness will have to go with it too. I kept the original exhaust (only one tube from the gearbox after second cat to the rear). This ECU, with part numbers 2171530691, A2171530691, and 5WK90520, Since the W203's were made from 2003-2009, the 722. This video shows a car with broken engine ECU and this is a tip that will Part 2 - Installing the Lexus 3UZ FE V8 engine , how the mounting brackets are made , the sump made to fit into the Mercedes and the Gearbox mounting Like S-Class (W221) - Replacing ECU - what's involved? - Let us assume for a moment that I want to replace the ECU in a 2007 S600, using a used ECU (same part number) from a donor vehicle. I buy A 203 540 95 47 . W203 Used ECU swap successful! I found it very difficult to get information on replacing my ECU with another one that wasn’t brand new. W203 missing ecm, found a used one, is it possible to use it on this car, does it need programming before trying it ? Quick video of my W203 C270 before and after an ECU remap. 8bhp and 67. koj, xvo, mhx, xxx, zmp, cti, iab, xtx, ssx, kct, efn, hlm, txf, biq, kwu,