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Hello and welcome
There are quite a few conditions that can turn the check engine light on, by the way whenever the check engine light turns on first these other lights will turn on also even though there is most likely nothing wrong with them they are disabled while the check engine light is on. The only thing we need to be concerned about at this time is the check engine light, if the car has no drivability issues otherwise the problem may just be emission control related. It could also be related to the recent repairs, the first thing he should do is to take a look under the hood for any hoses that may be disconnected, check to make sure the gas cap is on and tight, check the coolant level.
There are diagnostic codes in the computer and the next step would be to find out what they are, most Aotoparts national chain stores like Autozone, O Reilly and others will check those codes at no charge and give him a print out of the results, this is what I would need so I can determined what the problem may be and how to go about finding a solution
Sounds good, when you reply please let me know if it's a 4 cyl or V6, thanks.