Toyota Sienna Transmission - Error code PO770

Maintenance/Repairs
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3

The $3600 is for a rebuilt. My local mechanic says he can do it for $3000. Since the car seems to be running perfectly well except for the check engine light I plan to keep driving until the transmission fails or it comes up for inspection in October 2010 whichever comes first. I hope this is a sensible approach. Many thanks for your advice.