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Since all cars after '96 have OBD 11 it takes a scanner to remove the trouble codes. Auto Zone will do it for free. it does have obdII but the codes will be erased by unhooking the battery.

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โˆ™ 2005-10-25 22:24:33
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Q: Will unhooking the battery after replacing an ignition coil on a 1999 Toyota Sienna reset the check engine light?
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When replacing a battery in a 1999 Toyota Sienna do you have to reset the computer?

No. But; The van may seem to act a little different until it re-learns what it forgot.

Would replacing the battery trigger the check engine light to come on a 99 Sienna?

My check engine light came on because the terminals were not connected tightly. no. quite the contrary. if you have a "check engine" light on, disconnecting, or in this case replacing the battery will turn it off. you have a different problem.

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