The best way to Troubleshoot an O2 Sensor 1See if the examine engine light is lit on the dash. The check engine light indicates that there is a problem using the personal computer controls in the car. In the event the light is on, plug the diagnostic cable of a scan tool in to the diagnostic connector of the car. You will usually come across this below the dash, close towards the steering column. Follow the scan tool's instructions on how to read the codes that the engine computer has stored. If any of those codes describe an oxygen sensor fault, you've difficulty inside the oxygen sensor circuit.
2Unplug an oxygen sensor from the wiring harness. Connect two in the leads from one channel from the oscilloscope or graphing meter to the oxygen sensor wiring. Get started the engine and let it heat up; the sensor is not going to operate at its normal voltages until its temperature reaches 600 degrees Fahrenheit. The meter or scope shows the voltages measured as time passes, and graphs them.3Watch the graphing on the scope or graphing meter. It is best to see a wave pattern, moving up from about 0.2 volts to 0.9 volts, and back down to 0.two volts with an even pattern ">diagnostic car tool, or waveform.
When you see the pattern alter radically and not in a uniform fashion, or when the voltage abruptly drops to 0 volts ">auto diagnostic software, it truly is a sign of a failed oxygen sensor. It is actually probable for an oxygen sensor to run far enough out of range to bring about issues, and nonetheless not trigger the examine engine light.4Repeat the scope or graphing meter check for each and every sensor. If each of the sensors test standard, inspect the wiring from the connector to the electronic handle module for breaks or shorts. You are able to do the identical test together with the scope or graphing meter where the wires connect towards the engine personal computer. If the sensor tested OK at its plug, but not at the engine personal computer, there is almost certainly a wiring concern.
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