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My '89 240 (LH 2.4) had a 561 ECU. I swapped it out with the interchangeable 951 ECU. It didn't fix the problems my car was having, but I kept the newer model (951) in there.
The 561s and 951s should work with your car. I was able to get mine off of eBay for about $90 shipped. The last few that have been sold on there went for about $175.
By what the posts say, the 561 replaced the 556, and the 951 supercedes the 561. Someone please correct me if I'm wrong.
Here are two links for you:
http://www.brickboard.com/RWD/index.htm?id=382741 (an archives discussion concerning the 556 ECU)
and
http://www.atpelectronics.demon.co.uk/Catalogue/volvo.htm (a reference guide for ECUs, etc..)
Regards,
Eric Staufer,
'89 244DL 119k
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