Mitsubishi FUEL Manual page 217

Code No. P0125 Feedback system
Range of Check
D The engine coolant temperature is approx. 80_C or more.
D During stoichiometric feedback control
D The vehicle is not being decelerated.
Set Conditions
D Oxygen sensor (front) output voltage has been higher or lower than 0.5 V for
at least thirty seconds.
GDI -
Troubleshooting
Probable cause
D Malfunction of oxygen sensor (front)
D Open or short circuit in the oxygen sensor (front)
circuit or loose connector contact
D Malfunction of engine-ECU <M/T>
D Malfunction of engine-A/T-ECU <A/T>
13I-23