![]() ![]() Note: Because it is installed in the exhaust manifold or pipe, both of which contract when cool, an oxygen sensor might be very difficult to loosen when the engine is cold. There is no set time when O2 sensor should be replaced, but 100,000 miles or 5 years is a good guideline, or when the check engine light indicates a fault. The oxygen (O2) sensor informs the engine computer how much free oxygen is in the exhaust, allowing it to judge exactly how much fuel to provide for best power, economy, and emissions. This page is taken from our digital online manual 38040 for the 2005-17 Chevrolet Equinox, 2010-17 GMC Terrain, and 2006-09 Pontiac Torrent, 2WD or 4WD with 4 cylinder or V6 engines. Get a quote and book an appointment online or speak to a service advisor at 1-80.All Haynes Digital Online Manuals feature everything you love about our books in an instantly accessible digital online form, that you can use via any device with an internet connection. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. The low voltage condition is excessive oxygen in the exhaust or problems causing the issue. The O2 sensor circuit for bank 1 sensor 2 is used to give a voltage feedback to the ECM showing how much oxygen is in the exhaust stream to help the engine control the fuel-to-air ratio better. Repairing exhaust leaks before the sensorĪdditional comments for consideration regarding the P0137 code Repairing or replacing the wiring or connection to the O2 sensor for bank 1 sensor 2 Replacing the O2 sensor for bank 1 sensor 2 This leads to poor fuel mileage and possible premature failure for some engine components. ![]() The ECM cannot correctly control the fuel-to-air ratio of the engine fuel mixture if any O2 sensor is malfunctioning. The voltage output from the O2 sensor may be due to exhaust leaks causing the O2 sensors to give low output voltages. Repair any harness that is damaged properly to prevent erratic readings from the sensors.Ĭheck the removed O2 sensor for damage from a broken catalyst and replace the catalyst if it has come apart. Repair any exhaust leaks before the sensor to prevent excess oxygen getting into the exhaust stream causing the low voltage readings.Ĭheck the O2 sensor for oil or coolant contaminants that could foul the sensor. Monitors O2 sensor data to see if the voltage is switching back and forth between low and high at a fast rate compared to other sensors.Ĭhecks the O2 sensor wiring and the harness connections for any corrosion in the connections.Ĭhecks the O2 sensor for any physical damage or fluid contamination.Ĭhecks for exhaust leaks before the sensor.įollows the manufacturer's specific pinpoint tests for further diagnosis.Ĭommon mistakes when diagnosing the P0137 code?įollow these simple guidelines to prevent misdiagnosis: Scans codes and documents freeze frame data then clears codes to verify failure. How does a mechanic diagnose the P0137 code? You may have exhaust leaks before or near the O2 sensor in question.The Check Engine Light will be illuminated.The engine will run rich during the testing of the sensor for problems. ![]() The ECM uses other O2 sensors to try and control the fuel injection with their values. The ECM detects the low voltage problem and turns on the Check Engine Light. 21 volts when the ECM has commanded the fuel to a targeted rich condition on that bank of the engine. This code occurs when the engine control module (ECM) sees the voltage of the O2 sensor for bank 1 sensor 2 below. 21 volts indicating excessive oxygen in the exhaust. ![]() P0137 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 is failing to increase the voltage output above. O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2) What the P0137 code means ![]()
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