A failing alternator.
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It is important to pay attention and understand why the warning lights come on. The Check Engine light will flash because there is in issue within the cars engine, the number of flashes usually indicate the code number.
Set it to trip A and hold reset turn ignition off then turn ignition on and maintenance light will flash and your done.
If the check engine light is flashing the engine is misfiring. Most likely a bad ignition coil.
pull out the battery or what ever is in front of it , or get a flash light and get your hands in there. it cant be that hard , you must atleast look at the back or call Toyota to see if it is poossible to remove the bulb and how to do it
Of course they will flash until the battery runs down. So the time depends on how good the battery is. I have personally seen them flash for 6 hours straight.
turn on key and depress the reset button. let tire light flash 3 times and turn it off. this resets the 98/99 sienna. it may also work on the forerunner
Flash drives are powered from the power source in your computer.
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Flash the ECU