P0133 MITSUBISHI Cylinder 1-4 Heated Oxygen Front Sensor Circuit Slow Response

Possible causes
– Faulty Front Heated Oxygen Sensor Bank 1
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 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 1 usually takes care of the problem.
When is the code detected?
The response of the voltage signal from the sensor takes more than the specified time.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– High Fuel Consumption
– Excessive Smoke from Exhaust
P0133 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 P0133 code
2004 MITSUBISHI ENDEAVOR POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2005 MITSUBISHI ENDEAVOR POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2001 MITSUBISHI DIAMANTE POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2001 MITSUBISHI DIAMANTE ELECTRICAL SYSTEM
2002 MITSUBISHI DIAMANTE POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)
2002 MITSUBISHI DIAMANTE ELECTRICAL SYSTEM
2001 MITSUBISHI DIAMANTE ELECTRICAL SYSTEM
2002 MITSUBISHI DIAMANTE ELECTRICAL SYSTEM
2001 MITSUBISHI DIAMANTE ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL