P0134 1/1 O2 Sensor Stays at Center
NAME OF CODEO2 Sensor Stays at Center
WHEN MONITORED
With the engine running for more than 2 minutes and engine temperature greater than 170°.
SET CONDITION
The oxygen sensor signs voltage is between 0.35 volt and 0.55 volt for 1.5 minutes.
THEORY OF OPERATION
The oxygen sensor is a voltage generating device. The PCM receives exhaust gas information from this O2 sensor. The sensor detects exhaust gas content by a galvanic reaction within the sensor that produces a voltage. After measuring the amount of oxygen in the exhaust gases, the oxygen sensor tells the PCM how well its output signals are controlling the air/fuel ratio. Variations in the signal from this O2 sensor serve as air/fuel ratio indicators. Changes in the sensor signal occur because the air/fuel ratio is constantly changing. When oxygen content is low (rich mixture), the voltage signal will be approximately 1.0 volt. When oxygen content is high (lean mixture), the voltage signal will be low, approximately 0.1 volt.
POSSIBLE CAUSES
- Sensor output wire open
- O2 sensor failure
- Powertrain control module failure
- Dirt/moisture/grease causing voltage tracking in connector
- Connector wires