1999 Volvo V70 XC Q&A
1999 Volvo V70 XC Question: Cleaning ETM vs. Replacing?
You may not have a choice as to which ETM you install, they are probably only available from Volvo. There's an extended warranty on these ETM's, so I would check to see if your vehicle is still under the warranty. Cleaning is good but often doesn't address the issue of a bad ETM, and the software will need to verified that is is up to date as well. - Bret Bodas