P2000 Toyota Oxides of Nitrogen Trap Efficiency Below Threshold Bank 1

Possible causes

– Sensor or solenoid faulty
– Connector terminal contact is damaged or corroded
– Wire harness – Check harness for correct voltage, open, short to ground or short to voltage
– Update control unit software – Check for the latest control unit update
– Powertrain or Engine Control Module faulty
– Catalytic converter damage
– Catalytic converter improper operation

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)