P0154 MITSUBISHI Cylinder 2-3 Heated Oxygen (front) Sensor No Activity Detected

Possible causes
– Faulty Front Heated Oxygen Sensor Bank 2
– Front Heated Oxygen Sensor Bank 2 harness is open or shorted
– Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks may be faulty
– Exhaust gas leaks
Tech notes
Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.
When is the code detected?
The voltage from the sensor is constantly approx. 0.3V.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– High Fuel Consumption
– Excessive Smoke from Exhaust
P0154 MITSUBISHI Description
The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.
MITSUBISHI Technical Service Bulletins for P0154 code
2006 MITSUBISHI GALANT ENGINE AND ENGINE COOLING:ENGINE
2006 MITSUBISHI LANCER ENGINE AND ENGINE COOLING:ENGINE
2006 MITSUBISHI OUTLANDER ENGINE AND ENGINE COOLING:ENGINE
2001 MITSUBISHI DIAMANTE POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2002 MITSUBISHI DIAMANTE POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
1999 MITSUBISHI MONTERO SPORT ENGINE AND ENGINE COOLING:ENGINE
2000 MITSUBISHI MONTERO SPORT ENGINE AND ENGINE COOLING:ENGINE
2001 MITSUBISHI MONTERO SPORT ENGINE AND ENGINE COOLING:ENGINE
2002 MITSUBISHI MONTERO SPORT ENGINE AND ENGINE COOLING:ENGINE
2003 MITSUBISHI MONTERO SPORT ENGINE AND ENGINE COOLING:ENGINE