I don't know what fault codes my old 1990 Volvo has, or how to retrieve them. Does it have a place to connect a code reader?

check engine light - catalytic converter - 1990 760 turbo
I just got a check engine light -- and temporary loss of power. After cooling once, runs fine. Apparently no cooling or oil problems. Someone said problem might be clogged catalytic converter.

check engine light - 1990 760 turbo sedan. I just had a reduction in engine power (near stall) -- and check engine light came on. I can find nothing wrong with my engine cooling or oil level. I parked car for a while to cool. Then I started again -- and car runs fine, but check engine light is still...