Live Data Monitoring: Use an OBD-II scanner to view the O2 sensor voltage. At operating temperature, the voltage should "cross" the 0.45V center line multiple times per second. If it stays flat or moves slowly, the sensor is likely defective.
The Ford diagnostic trouble code indicates an Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 1) ford p0133-a8
When the P0133-A8 code appears, you may notice one or more of the following symptoms: Live Data Monitoring: Use an OBD-II scanner to