What causes the p0138 code on a Dodge Ram?
What causes the p0138 code on a Dodge Ram? Here are the most common issues that cause the P0138 code in the Dodge Ram. They are presented in order (somewhat) of most to least likely to cause the problem. Bad Oxygen Sensor – The O2 sensor itself is one of the most likely reasons that P0138 is triggering your service engine soon light. When is the p0138 O2 sensor code detected? Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem. What does this mean? When is the code detected? The P0138 code is set when...