P143E Code – Direct Ozone Reduction Catalyst Temperature Sensor Gradient Too Low

Code P143E Possible Causes
Direct Ozone Reduction Catalyst Temperature Sensor circuit poor electrical connection
Direct Ozone Reduction Catalyst Temperature Sensor harness is open or shorted
Faulty Direct Ozone Reduction Catalyst Temperature Sensor
Absolute pressure sensor
Blocked or bent rubber tube to EVAP control system pressure sensor
EVAP canister is saturated with water
EVAP canister or fuel tank leaks
EVAP canister vent control valve and the circuit
EVAP control system pressure sensor
EVAP purge line pipe and rubber tube leaks
EVAP purge line rubber tube bent
Foreign matter caught in EVAP canister vent control valve
Foreign matter caught in fuel filler cap
Fuel filler cap remains open or fails to close
Incorrect fuel filler cap used
Incorrect fuel tank vacuum relief valve

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