Code 25 - Air-Fuel Ratio Lean Malfunction

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

Detecting Condition
(A) Main heated 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.
or
(B) Engine speed varies by more than 20 rpm over the preceding crank angle period during a period of 25 seconds or more under the following conditions
(2 trip detection);
^ Engine speed below 950 rpm.
^ Engine coolant temperature 80°C (176°F) or more.

Trouble Area
(A) ^ Open or short in main heated oxygen sensor circuit.
^ Main heated oxygen sensor.
^ Ignition system.
^ ECM.
or
(B) ^ Open or short in Injector circuit.
^ Fuel line pressure (injector leak or blockage).
^ Mechanical system malfunction (timing belt skipped).
^ Ignition system
^ Compression pressure.
^ Mass air flow meter.
^ ECM.

Malfunction Indicator Lamp
Normal Mode On
Test Mode On

Recorded in memory?
Yes