How do you read the O2 sensor on scan tool?
How to Test O2 Sensor Using an OBD2 Scan Tool
- Insert the OBD2 scan tool connector to the diagnostic link connector (DLC) on your vehicle.
- Turn on your vehicle’s engine so that the scanner can communicate with the vehicle’s onboard system.
- After the scanner boots, go to the menu and select ‘Trouble Codes’ or ‘Codes’.
What voltage should O2 sensors read?
approximately 0.45 volts
When the air/fuel ratio is perfect and the fuel mixture is 14.7:1 (stoichiometric), the sensor will generate approximately 0.45 volts. This is difficult for the engine controller to achieve. On a normal operating O2 sensor you should see the voltage bounce around quite a bit from rich to lean.
What does a bad O2 sensor graph look like?
With the engine warm, graph the O2 sensor output. A good sensor will oscillate from below 0.2 volts to above 0.8 volts, looking approximately like a sine wave. A bad sensor will be flat-lined and show no response to snapping the throttle.
How to test O2 sensors with an automotive scan tool?
If you have an auto scanner with some power they offer a menu of sensors to observe. You can also record the information in snap shot mode and review it off the car. Finally, some tools can run a specialized O2 monitor test. At the end of the test it lists the sensor activity and location.
Why does my O2 sensor keep reading RICH?
Meaning the exhaust gases are actually lean or rich due to a failure of a fuel system component. A prime example of this is a leaky fuel injector. Other common issues like a vacuum leak or an engine misfire can also cause these readings. To clarify my point, if you set an O2 code, it doesn’t always indicate the sensors need replacing.
When to use an OBD II scan tool?
This can not only point you in the right direction, but is also considered by many professional technicians as the first step in a logical path of diagnosis. When a check engine light comes on you should connect an OBD II scan tool and hit the read button.
What’s the difference between O2 sensor and zirconia sensor?
The titania type of O2 sensor is made from a different kind of ceramic than the zirconia style. It works quite a bit differently than a traditional sensor. It isn’t an option for many makes and models of cars. Titania sensors do not send signals in the same manner. A zirconia sensor creates voltage.