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unattach the battery for a few minutes and then reattach. it will reset itself if there was just a gas cap issue.

I have a 2004 Sienna. The "Maint Reqd" light came on at exactly 7500 miles. I saw it. A check of the maintenance manual shows that an oil change should be done every 7500 miles. Coincidence? I think not.

(Yes, the dealer may recommend every 3000 or 5000 miles, but Toyota recommends 7500 for most drivers.)

Any guesses on how to reset it would be appreciated.

I called my local dealer after the "maint reqd" light came on and was told how to reset it. With the key in the off position, hold in the trip odometer reset button and turn the key to the run position without starting the engine. Continue to hold the button for 3 to 4 seconds and then release the button. This resets the maintenance light, I don't know if it works for the service light or not. It's woth a try!

you need to make sure that the odometer is in the normal setting (not on one of the tripmeter settings.

First, if it was the gas cap, just tighten it and it will reset itself in the next 100 miles or so. If it is something else, like a leaky gas cap it will never reset. But to reset the OnBoardDiagnostic (OBD)Computer... Go to eBay and search "obdII" and buy one, they run about $50.00 including shipping. There are two types, ISO for Chrysler and some Japanese, and the other one for all the others like Ford and GM. There are several that are both, that is the kind you want. Be sure to email the eBay seller and ask if it is used with your year and model. (1996 was a changeover year for OBDII technology, so this advice may not apply to everybody--but the dealer service guy can tell you over the phone--ask him if it is OBDII compliant.) When you get it, you just plug it in and let it cycle 4 or 5 times and it resets everything. You then have to drive your car for 50 to 100 miles for the onboard computer to test everything, and in the meantime your car will fail smog checks because it has no history in the computer and the smog test procedure demands a history even if there is no pollution. Cut and Paste http://search.ebay.com/OBDII for a list of them for sale on eBay. Most units come with a list of generic fault codes so you can tell what the problem is, this could be very helpful.

My 1999 Sienna had flat tire light. Found low air in tire, sears pluged hole & filled up to 32#. Can not reset light. 1-Week later ABS light is on too. Week later engine light is on also. Took it to the dealer, they said I had bad cat converter. I had them reset the engine light and it's been off for 35 days now. Car has always ran fine & ABS & flat tire light still on?? Freind of mine has changed his cat converter once since under warrenty & I think it's a faulty signal.

the response about the trip meter is correct, but the instructions on resetting the light are detailed in the manual. Try the manual first and save yourself some time.

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Q: How do you reset the 2004 Toyota Sienna check engine light?
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