What does the P0137 trouble code mean?
1 Answers
P0137 trouble code indicates a low voltage in the oxygen sensor circuit. Here is an introduction to automotive oxygen sensors: 1. Cause of the fault: The oxygen sensor fault code appears due to contamination of the oxygen sensor, crossover between the oxygen sensor's signal and ground circuits, short circuit in the oxygen sensor signal circuit, failure of the oxygen sensor itself, or electronic control module failure. 2. Function: It measures the oxygen content in the engine exhaust. The ECU controls or adjusts the engine's fuel injection quantity based on the sensor's readings to achieve better fuel economy. Typically, the ECU maintains the oxygen sensor's temperature by controlling the heater's switch. If the oxygen sensor fails to reach the required temperature within the specified time or cannot maintain the set temperature, the trouble code will appear.