Oxygen (O2) Sensor

Disconnect O2 sensor wire(s). Start and warm engine to normal operating temperature. Measure voltage between O2 sensor connector and ground. Check between White or Red/Blue (positive) and Green (negative) wires. Voltage should be greater than .6 volt at 5000 RPM and less than .4 volt when throttle is released quickly. If voltage is not as specified, replace O2 sensor.