Posts Tagged: trouble code
Common Causes of a P0138 Code: O2 Sensor High Voltage
P0138 Code: Causes, Symptoms, and Fixes Explained Quick Summary When I diagnose a P0138 code, I know the engine computer is detecting a high-voltage signal from the rear oxygen sensor (Bank 1, Sensor 2). That usually means the sensor is reporting a consistently rich condition—or the circuit itself is faulty. In most cases, the root cause is a • failing O2 sensor • wiring issue • exhaust leak, • or a true rich-running condition. The fix comes down to verifying sensor data, checking wiring integrity, and confirming whether the engine … Read More
P0137 trouble code: What it means and how to fix it
Learn what a P0137 trouble code means and how to fix it A P0137 trouble code is defined as: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 1). This sensor is located on the engine bank that houses #1 cylinder and is located AFTER the catalytic converter. The oxygen sensor measures oxygen levels in exhaust gases post-combustion to optimize engine performance and minimize air pollution. If oxygen levels are too low, indicating a rich fuel mixture, the PCM reduces fuel delivery. Conversely, if oxygen levels are too high, indicating a … Read More