My 1998 v70 wagon check engine light will not turn off, Oil level is up and viewing thru oil fill shows it is pumping well. The engine is running very well and is cool.
IS there another action which would be monitored by that light.
I bought this car from an auction and it was delivered without oil in the engine but there is no apparent problem after refilling the oil.
Only 125,000 miles and car is beautiful.
1990 240
1987 740
1996 850
1998 v70

I usually advise people to stop at an autoparts store and get the engine codes read and cleared for free. In your case, get a really good scanner for both of your cars. I like a laptop based scanner with a cable and software for home use and trouble shooting. Do a google search.

Yes, the CEL will turn on for all kinds of reasons. Most of them are for emmission problems and electrical problems. Do not ignore them, doing so can kill the cat converter or other expensive parts.

Klaus
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There is no present time, just the past and future