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If that doesn't fix it, then it's probably the VSV valve (part of the EVAP system) attached to the charcoal canister that has gone bad.
![toyota diagnostic trouble codes 730 toyota diagnostic trouble codes 730](https://data2.manualslib.com/first-image/i32/156/15561/1556053/toyota-celica-2005.png)
Going a few months without replacement runs the risk of destroying the catalytic converter. They usually go bad approaching 80,000 miles. O 2 sensors are wear items and do not last forever.
#Toyota diagnostic trouble codes 730 code
Some repair facilities, including dealerships, take the "shotgun" approach-which is to replace every possible item that may have caused the fault code to go on.