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Engine Control Units aren't known to be a problem on 92 940 models. If the car runs, you kind of checked it. In-depth diagnostics are possible but won't necessarily highlight an impending failure anyway.
The climate control units (manual climate control) can cause trouble, but it isn't an epidemic. The 940 series is better than most used cars, in my opinion. You will have the occasional problem, but no more (and usually quite a bit less) than other used cars of similar age and miles. But they aren't 100% trouble free either.
Have the mechanic check the engine mounts, timing belt (if it was changed) and if it's a turbo he should check around for signs of problems. The usual stuff. Front brakes on 940s are a soft spot. They function well but the slide pins can bind and then seize, causing the brakes to pull to one side or the other.
If you aren't in the US, find out if it has a 16valve engine. They are good engines, but more vulnerable to problems than the standard 8 valve engine. The 16v was, I believe, not available in the US market after 1991, on the 940 series. However I could very well be mistaken about that.
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Chris Herbst, near Chicago.
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