Question about 2004 Mercedes-Benz C-Class

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Mercedes c220 cdi estate, sticking in gear.

I have a 1999 merc estate. On start up the ECU light and the ABS light stay on, the speedo doesnt work and cant change gear (auto box with flicka).
Got another ECU unit that bolts to ABS unit, plugged it in, started vehicle and lights went out, did this a couple of times and it worked. Before having a party to celabrate, we plummed the ECU into the ABS, started the car, lights went out, put vehicle into reverse and lights came back cancelled.....
Went back to the chap that supplied ECU and he confirmed that it was working on his vehicle before it was removed.
Disconnected battery, re-installed original ECU tried it. lights on, no speedo and would only work in first and reverse. Disconnected battery again, put 2nd ECU back on car, cleaned all contacts, lights on but speedo working so gave it a run. 2 miles down the road lights came back on, another two miles and speedo stopped. went to turn vehicle around, put into reverse and lost all gears. turned engine off, restarted and got reverse, turned around, started going forward, no speedo, so stuck in first. turned engine off, removed key, restarted, lights still on but speedo working, got to second gear before speedo stopped and drove home in second.
Vehicle now parked up, battery disconnected and i'm off to the pub in disgust.........
CAN ANYBODY HELP.... I feel that the problem is caused by a sensor not the ECU, or am I wrong......

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Sounds to be a loose or corroded wire/s at either starter motor or at battery fusible links.
Also check the earth strap (Cable) between engine and bodywork.
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Testimonial: "thanks mate very helpful, can you tell me if a second hand ecu can be reprogrammedand. the mercedes fault codes are:- P1190 - 128 : Y74 N3/9 "

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