Code 27 - Sub-Oxygen Sensor Signal

Data Trouble Code No.27 - Sub Oxygen Sensor Signal

Detecting Condition (2 trip detection)
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:
- Engine coolant temperature 80°C (176°F) or more.
- Engine speed is1,500 rpm.
- Accelerator pedal fully depressed for 2 seconds or more.

Trouble Area
^ Open or short in sub oxygen sensor circuit.
^ Sub oxygen sensor.
^ Engine control module.

Malfunction Indicator Lamp
Normal Mode ON
Test Mode ON

Trouble Code Stored In Memory?
YES

NOTE: (2 trip detection logic)
See Description of 2 Trip Detection Logic under "Trouble Code Descriptions".
Diagnostic Trouble Code Descriptions