Make sure this is the Check Engine light and not the Service reminder oil change light. If there is a Check Engine condition then you need to check both engine computers at the diagnostic connector, the LH 2.4 fuel system on connector port 2 and the EZK ignition system on port 6. One of those will almost surely have something other than 1-1-1 if the dash lamp is lit. Refer to the 700/900 FAQ here for use of the OBD connector and interpretation of the codes. If the engine is otherwise running relatively normal then it's possible there's a transient condition, so always perform a reset and wait to see if the problem soon returns before getting too excited. Also take mental note of what stage of running the lamp re-lights after a reset, either right away on an attempted restart, after a moment of running, or after a period of operation, even days, as that can be a major clue as to the cause and severity.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now