Engine Light Code 21
05-13-2013, 04:24 PM
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Engine Light Code 21
Ive got a 95' 4runner SR5
V6 Auto 2wheel, my Engine light came on a day ago. I manually ran the codes for the light, and it is showing code 21
Oxygen Sensor Signal
Oxygen Sensor Heater Signal
V6 Auto 2wheel, my Engine light came on a day ago. I manually ran the codes for the light, and it is showing code 21 Oxygen Sensor Signal
*Detection of Oxygen Sensor Deterioration*
- Oxygen Sensor Circuit
- Oxygen Sensor
- ECU
OR
Oxygen Sensor Heater Signal
*Open or short circuit in oxygen sensor heater signal(HT)*
- Oxygen sensor heater circuit
- Oxygen sensor heater
- ECU
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