Federal Models

Data Trouble Code No. 25 - Air-Fuel Ratio Lean Malfunction

Detecting Condition
Main oxygen sensor voltage is 0.45 volts or less (lean) for 90 seconds under the following conditions (2 trip detection);
- Engine coolant temperature 70°C (161°F) or more.
- Engine speed 1,500 rpm or more.

Trouble Area
^ Main oxygen sensor
^ Open or short in main oxygen sensor circuit.
^ Ignition system.
^ Engine Control Module.

Malfunction Indicator Lamp
Normal Mode On
Test Mode On