Although it is a temptation to replace it right away, it wouldn’t hurt to check out the wiring harness around it beforehand. Bad Oxygen Sensor– The O2 sensor itself is one of the most likely reasons that P0138 is triggering your service engine soon light.
They are presented in order (somewhat) of most to least likely to cause the problem. Here are the most common issues that cause the P0138 code in the Dodge Ram. A poor air fuel mixture going through the catalytic converter But, like anything that causes the service engine soon light to come on it is a good idea to have it fixed as soon as possible. Most of the time, it’s not a breakdown risk. In some cases, there can be other symptoms as well. Typically, the only symptom of P0138 is going to be the service engine soon light. Here’s a pretty helpful video from AutoEclinic on diagnosing the code: There are also some less likely problems that can cause P0138. Voltage to the sensor is to high (wiring problem, think short).The voltage at the sensor remains above threshold for 20 seconds or more.P0138 is a common OBDII code that occurs in many vehicles, including the Dodge Ram.
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