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Volvo Diagnostic Reader S80 2001

Quite correct. These new computers do require the stored codes to be cleared. The typical hand held scanner only does engine related scanning, while yours scans everything.
On my 1995 850, I used to read and clear the codes at evvery oil change. Some codes were there because I boosted to redline with 89 octane, while others complained about dust build up in the ECC. Clearing the codes allows the computers to start with a fresh slate, but you should write down the "potential" problems in case they happen to pop up again.
There are those that think codes should only be read when the check engine light comes on. Wrong. The CEL represents a severe error or a collection of smaller errors which have been ignored.
I like your code reader, but I would need a 100ft cord to attach it to my desk top. I am old and too cheap to buy a lap top just for a car :)

Klaus
--
The more I learn, the more I forget. So why learn?






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