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The code PO499 on an OBD-II scanner typically indicates a problem with the evaporative emission control system, specifically related to the evaporative system purge flow. This code suggests that the engine control module (ECM) has detected an issue with the flow of fuel vapors from the charcoal canister to the engine, which can lead to increased emissions and potential performance issues. It is advisable to check the purge valve, associated hoses, and the canister for any blockages or leaks. If necessary, consult a professional mechanic for further diagnosis and repair.
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Scan the ECU with an OBD2 scan tool to retrieve the code that has been set.
Why don't have communication with the scan tool?
I have toyota camry 2003se. There is no communication obd2. Scan doesn't connect. Tested all wires, from obd2 connector to ecu, replaced ecu to test, ecu ok.
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