Code 27 - Sub-Oxygen Sensor Signal

Data Trouble Code No. 27 - Sub Oxygen Sensor Signal

Detecting Condition
Main oxygen sensor signal is 0.45 volts or more and sub 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.

Trouble Area
- Open or short in sub oxygen sensor circuit.
- Sub oxygen sensor.
- ECM.

Malfunction Indicator Lamp
Normal Mode ON
Test Mode ON