Code 21
Problem with O2 Sensor feedback circuit. Occurs if engine is in closed loop, but O2 sensor stays rich or lean (no signal) for more than 22 seconds. Engine temperature should be above 170°F (77°C) and engine speed is above 2000 RPM.
Problem with O2 Sensor feedback circuit. Occurs if engine is in closed loop, but O2 sensor stays rich or lean (no signal) for more than 22 seconds. Engine temperature should be above 170°F (77°C) and engine speed is above 2000 RPM.