Question about Toyota ECHO
P0442 Evaporative Emission System Leak Detected (small leak)
P0457 which is the gas cap is loose or off.
This means that there may be a leak in the hoses that lead from the gas tank to the charcoal canister, if so equipped.
Good luck on finding the leak and repairing.
Posted on Nov 07, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
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Repair open or short in voltage feed circuit to Purge Solenoid.
Repair open in PCM purge command circuit.
Replace purge Solenoid.
Replace vacuum switch.
Repair restriction in Evap line or canister or soleniod.
Repair resistance in purge connector.
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, or
Inspect the EVAP system for cuts/holes in tubes/hoses.
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