I think bad coil cause 灯亮.

I'm not sure. But I think your engine use individual coil on each cylinder. Check with dealer, not Midas.
Waterpump does not have anything to do with 灯亮.If it does not leak very bad, you can buy a bottle of leaking stoper at most autoparts shop. I don't remember the brand. It is a gray color flat bottle. It looks like mud.

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