hey guys, apart from regular maint and doing the head gasket on this car, I'm still a mb newbie. while driving a very long distance today, I got a check engine light while up in the mountains in the middle of nowhere. the car drove and made it back like a champ though. I was slightly worried about being stranded and being attacked by wolves really!

I did a search and found some posts about later 124 models ailing from the same light. none mentioned how I should pull a code. the vehicle is a 88 300e, hence my name. how do I pull a code on this vehicle?? I read about a black box with a switch and led. press for 2-4 seconds and then what happens? please verify. obd2 and scan tools have spoiled me and made me ignorant. I thank you in advance, I need to get this solved so I can drive with confidence.

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88 300e
92 mr2