Broadband oxygen sensors are used to increase the accuracy of the fuel and air ratio in the engine. O2 broadband sensors are equipped with a five-wire system instead of the traditional one- or three-wire sensor. The oxygen sensor measures the amount of that substance that enters the engine at a particular time. The sensor transmits that information to the engine computer, which allows regulating the mixture of air and fuel. It is essential to check the sensor if you see the engine check light coming on, or if the engine of your car is running regularly.
- Open the hood of the vehicle and locate the broadband oxygen sensor. The sensor is mounted on the exhaust manifold. Look in the repair manual for the location of the same in the diagram as it may vary depending on the manufacturer or installer.
- Disconnect the broadband cabling. It has five wires instead of the traditional one or three. Press the tabs on the sides and pull the wiring to remove it from the O2 sensor.
- Connect the positive lead of the multimeter to the terminal of the sensor signal cable. The signal cable terminal is the third from the side (the middle one between the five terminals). Plug the negative wire of the multimeter to earth. A ground connection can be the negative terminal of the battery or a metallic surface in the collector or motor.
- Set the multimeter to CD Volts. Start the engine and let the engine idle for one minute. Check the multimeter. You should see reading between 1 and 5 volts. If you do not get any reading, the sensor is faulty, and you should replace it.
- If the ohmmeter test is good, but the probe seems to have a problem, it is because it is a concern for richness, a manip ‘is possible also to test this parameter, but more complicated.
Replacing the Oxygen Sensor
- The exhaust manifold is cleaned at the location of the probe
- The anti-oxidant grease is applied to the thread
- The battery is disconnected
- The new lambda probe is put in place and screwed reconnects.
- We reconnect the battery.
And it’s OK … for confirmation, after starting the engine, wait 5 minutes to see if the indicator on the dashboard does not come back.
To make precise measurements, do not hesitate to invest in a multimeter of quality, such as those presented below: