Integrated Motor Assist (IMA) battery failures are not uncommon. The IMA battery will require replacement when it fails.
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Most reported 2000 Honda Insight problems
The Check Engine Light may illuminate due to an evaporative emission control solenoid failure. This is more common in areas of the country where salt is used on the roads during the winter.
IMA computer software failures. Depending upon the computer it will have to be replaced or updated with a software update from Honda.