Thanks once more the informed advice. I will proceed as recommended by the collective wisdom of the group and adopt a "Wait & See" strategy regarding the Check Engine Light and any associated codes that may reappear.

Update: Turns-out, it wasn't apparently all that hard to get a list of all those error codes from my mechanic. (Sorry – I didn't get the brand of reader they used). Anyway, I'm looking at them now and there are... thirty-eight! I thought that, before I Copy & Paste them in here I'd check and see...

I agree – I was surprised & disappointed that I couldn't get a copy of all the many codes my mechanic found. He showed them to me briefly on his screen, but he didn't have a way to print them out. I'm going to call him and see if my analysis is somehow still stored in the code reader memory and ...

Much thanks for everyone's extremely helpful, reassuring and informative replies! I'm going to go over them with my mechanic. You guys Rock!

I just brought my '02 V70 XC with 117k miles into my local garage after the Check Engine Light appeared. When they hooked-up the code reader, the result blew them away! Something like 2 dozen Error Codes were displayed – they had never seen so many. When I asked for a print-out of them, the mechanic...