Why did I replace the O2 sensor on my PCM?
Why did I replace the O2 sensor on my PCM?
But replacing an O2 sensor wouldn’t usually damage the PCM unless something like that did happened. More likely though, it had nothing to do w/replacing the O2 sensor, it was the attempt to reset the CEL that damaged the PCM. Some spark or other problem when the connection of the PCM port was made to the scan tool maybe.
Is there a way to test a bad O2 sensor?
The answer to, how to test a bad o2 sensor, will ultimately be determined by your ability to perform diagnostics. A voltmeter will provide you with the specific measurements, but the results may require further analysis of other components. Maybe there is a loose vacuum hose that is forcing the o2 sensor to read a high level of oxygen.
What should the voltage be on the O2 sensor?
To perform the actual test, start the car again and check the voltmeter’s voltage readings. The o2 sensor’s voltage should fluctuate within the 100mV – 900mV (0.10V to 0.90V) range. If it is within this range, the o2 sensor is operating normally and you can stop testing.
What causes a computer to fry after installing the O2 sensor?
So if the computer fried after installing the O2 sensor, there may have been a problem with the heater in the O2 sensor itself. So a defective heater in the O2 sensor is the only way to fry the computer. Tester jesmed1 July 6, 2016, 4:20am #6
But replacing an O2 sensor wouldn’t usually damage the PCM unless something like that did happened. More likely though, it had nothing to do w/replacing the O2 sensor, it was the attempt to reset the CEL that damaged the PCM. Some spark or other problem when the connection of the PCM port was made to the scan tool maybe.
What happens if the pre-Cat O2 sensor is bad?
If the pre-Cat O2 sensors are BAD, they will not be able to sense how Rich or Lean the exhaust gas is and consequently the PCM will not be able to fine tune the fuel injection to meet emission (pollution) standards. Not only that, your gas mileage will suffer (see: Symptoms Of A BAD Oxygen Sensor).
What happens when PCM injects too much O2?
If the PCM injects too much, the O2 sensors will let it know and the PCM responds by injecting less. If it doesn’t inject enough, they’ll make it aware of it and the PCM will inject more. The O2 sensors accomplish this by producing anywhere from 0.100 Volts to a maximum of 1 Volt of direct current that is sent directly to the PCM.
Why is the O2 sensor always reading high?
The O2 sensor produces it’s own voltage. The lower the voltage is the more oxygen there is in the exhaust gasses. The higher the voltage is the less oxygen there is in the exhaust gasses. If the voltage from O2 sensor is always reading high it means it’s not reading the oxygen content in the exhaust gasses.
