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The PO452 code on a 2000 Isuzu Rodeo indicates a problem with the fuel tank pressure sensor, typically related to a vacuum leak or a faulty sensor. To fix it, first inspect the fuel cap for proper sealing and any vacuum leaks in the EVAP system. If the cap is fine, test or replace the fuel tank pressure sensor. Additionally, check the wiring and connectors for any damage or corrosion before clearing the code and running the vehicle to ensure the issue is resolved.

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