Mitsubishi FUEL Manual page 119

Code No. P0150 Oxygen sensor (front) system <Bank 2
sensor 1>
Range of Check
D Three minutes have been passed since the engine has been started.
D The engine coolant temperature is approx. 80_C or more.
D Intake air temperature is 20 - 50_C
D Engine speed is 2,000 – 3,000 r/min or more
D Driving on a level surface at constant speed.
Set Conditions
D The left bank oxygen sensor (front) output voltage is 4.5 V or more when
the sensor output voltage is 0.2 V or less and a voltage of 5 V is applied to
the left bank oxygen sensor (front) inside the engine-ECU.
Range of Check
D Engine speed is 3,000 r/min or less
D During driving
D During air/fuel ratio feedback control
Set Conditions
D The left bank oxygen sensor (front) output frequency is five or less per 12
seconds on average.
MPI <6A1> -
Troubleshooting
Probable cause
D Malfunction of left bank oxygen sensor (front)
D Open or short circuit in the left bank oxygen
sensor (front) circuit or loose connector contact
D Malfunction of engine-ECU
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