The D4 indicator light flashing indicates that your car's computer believes that there is something wrong with your transmission.
This is what the manual for your 2000 Accord says:
The "D4" indicator comes on for a few seconds when you turn the ignition switch ON (II). If it flashes while driving (in any shift position), it indicates a possible problem in the transmission. Avoid rapid acceleration and have the transmission checked by an authorized Honda dealer as soon as possible.
Sometimes this will mean that you are simply low on transmission fluid, but you really should have it checked.
Hope this helps you.
It means your auto gearbox has a problem, which needs to be rectified, go to a qualified mechanic before its too late, as overtime, faulty gearboxes tend to break down more resulting in higher repair costs
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