Technical Description of OBD-II Trouble Code
No Activity Detected in O2 Sensor Circuit (Bank 1 Sensor 1)
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code that is applicable to vehicles equipped with OBD-II. Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
This code pertains to the front oxygen sensor on Bank 1. Essentially, the oxygen sensor is not functioning. Here’s why:
The powertrain control module (PCM) provides a baseline voltage of approximately 450 mV on the oxygen sensor signal circuit. When the sensor is cold, the PCM detects a high internal resistance. As the sensor warms up, the resistance decreases and it starts generating voltage based on the oxygen content in the exhaust. If the PCM determines that the sensor took longer than one minute to warm up or that the voltage is inactive (not reading outside the range of 391-491 mV), it considers the sensor inactive or open and sets the P0134 code.
Potential Symptoms
One or more of the following symptoms may occur:
Causes
A code P0134 may indicate that one or more of the following issues have occurred:
Possible Solutions
The most common solution is to replace the oxygen sensor. However, other possibilities include:
