Code 21
Problem with O2 Sensor feedback circuit. Occurs if engine temperature is greater than 170°F (77°C), engine speed is greater than 1500 RPM, and there is no O2 sensor no signal for more than 5 seconds.
Problem with O2 Sensor feedback circuit. Occurs if engine temperature is greater than 170°F (77°C), engine speed is greater than 1500 RPM, and there is no O2 sensor no signal for more than 5 seconds.