![]() ![]() Note down which two wires correspond to the heater circuit and proceed to Test 2. The two wires which register a resistance reading are the heater wires the other two will show up as an open circuit or infinite resistance.Īs the O2 heater is resistor-based, polarity is not a concern here. To test, set the multimeter to resistance mode and use it to probe and figure out which wires register a resistance (usually 4-6 Ω). These wires serve to heat up the O2 sensor to bring it up to operating temperature via a resistance-based heating element. With nothing more than a decent multimeter and premix flame (blowtorch or gas stove), a two-test sequence can reveal the identity of each wire, assuming the O2 sensor is fully-functional: Get a quote and book an appointment online or speak to a service advisor at 1-80.No, you don't have to rely on wire colors to figure out what's what. 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?
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |