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IMO your best bet is try the part from the breaker and then put a code reader on it to make sure it's talking. I did that with mine using OpCom on a Windows XP Netbook. Once you verify communication, all that's needed is reprogramming and you're good to go. On mine it was code C0551. The old broken unit would not communicate at all and caused a dead speedometer along with driveability issues.
You can read the part number off the bottom of the Bosch 5.3 and 5.4 units by removing the relay box, battery, and battery tray. Use an inspection mirror to see the bottom of the ESP unit. You'll need a very bright light strategically placed where the battery typically lives. I then used an iPhone with the magnifier feature and trained it on the mirror.
The 5.3 unit was later replaced with a different style on newer 9-5s. The location of the model number may be different.
There is a post from June 6 or so of '17 on this board where someone posted about a place in the Netherlands that can repair later ESP units:
I'm not too confident as vendors listed here (Xemodex, BBA Reman, and CheapABS) have issues repairing them.
posted by 66.150.8...
'04 Aero Sport Kombi
'03 Linear 5 spd. Krona Mods, 350 bhp
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