Code 27 - Sub-Oxygen Sensor Signal

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

Detecting Condition
(A) 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.
- Engine speed: 1500 rpm or more.
- Accelerator pedal fully depressed for 2 seconds or more.
or
(B) Open or Short in heater circuit of sub heated oxygen sensor for 0.5 seconds or more.

Trouble Area
(A) ^ Open or short in sub heated oxygen sensor circuit.
^ Sub heated oxygen sensor.
^ ECM.
or
(B) ^ Open or short in heater circuit of sub heated oxygen sensor.
^ Sub heated oxygen sensor.
^ Engine Control Module.

Malfunction Indicator Lamp
(A) Normal Mode On
Test Mode N.A.
or
(B) Normal Mode On
Test Mode On

Recorded in memory?
Yes