When Monitored

This diagnostic runs continuously when the following conditions are met:

• Engine running, the O2 Sensor 1/1 at operating temperature, pump cell active.
• When the PCM detects a circuit has fallen outside the allowable range during either the cold startup test or during O2 Sensor closed loop operation, a Hot test  is initiated.
• The O2 Sensor is turned off and a 20 second delay timer is started. Once the timer expires, the hot test diagnostic will be performed.