When i first used an OBD ll code came back said O2 sensor and mass air flow sensor. then after i replaced the gas cap and added fuel injector cleaner the check engine light went off but when I turned on my brights the check engine light came on again. This time there was a P2196 code saying HO2S ll (Bank 1 Sensor 1) saying could possibly be a problem with a short to the voltage signal circuit, or fuel injector leakage or O2 Sensor could need replacing. Can i therefore buy a digital multimeter to rule out the short to voltage signal circuit? Or to determine if I also have a blown fuse or damaged wiring? this time no code came up for the mass airflow sensor at all. i think the wires could have over heated when both the battery and alternator were damaged and had to be replaced.
My source says code 2196 means the signal coming from the O2 sensor is stuck on rich.
The sensor is supposed to switch back and forth from lean to rich to lean as the computer controls injector "on" time. If the sensor signal stays rich, in most cases there is a leaking injector, or the sensor is faulty. I doubt a short to anything would be involved.
The sensor generates a small ac voltage between zero and one volt. Less than 1/2 volt is lean and more than 1/2 volt is rich. There is a heater in the sensor that could short to the signal wire, but then you should have a code for the heater circuit too.
You can remove the sensor and check for excessive carbon buildup from a rich fuel mixture, or go ahead and replace it and see what happens. A repair shop would be able to check exhaust gas output to find out if its the sensor or a leaking injector.
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