California Vehicles Only

Data Trouble Code No. 27 - Sub Heated Oxygen Sensor Signal

Detecting Condition

Main Heated Oxygen Sensor signal is 0.45 volts or more and Sub Heated Oxygen Sensor signal is 0.45 volts or less under the following conditions (2 trip detection);

- Engine coolant temperature 80°C (176°F) or more.
- Accelerator pedal fully depressed for 2 seconds or more.
or
Open or Short in heater circuit of Sub Heated Oxygen Sensor for 0.5 seconds or more.

Trouble Area

- Open or short in Sub Heated Oxygen Sensor circuit.
- Sub Heated Oxygen Sensor.
- Engine Control Module.
or
- Open or short in heater circuit of Sub Heated Oxygen Sensor.
- Sub Heated Oxygen Sensor.
- Engine Control Module.

Malfunction Indicator Lamp

Normal Mode On
Test Mode On