2005 Chevrolet Avalanche: Oxygen Sensor Location Diagram?

Where is O2 sensor located.How many O2 sensors are there on Chevy Avalanche and When to replace the O2 Sensors.

The details with Diagrams are as follows:---


On Chevy Avalanche there are 4 Oxygen Sensors. 2 before the Catalytic converters and 2 after the Catalytic converter:

See the diagram shown below:----
Part number 1,2,10 and 11.



Unlike older vehicles when it was suggested to replace them every 80,000 miles or so, today's O2 sensors only need to be replaced when they actually fail and set a fault code. This is because of the cleaner fuel today as well as more efficient engines that burn less rich than before.


So, its not necessary to replace O2 Sensor after particular miles unless they have failed, dont replace them.

This details will help.
Thanks.

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Testing Heated Oxygen Sensor ?

Heated Oxygen Sensor
OPERATION
TESTING

 Details are as follows :----

Operation

The heated oxygen sensor supplies the PCM with a signal which indicates a rich or lean condition during engine operation. The input information assists the computer in determining the proper air/fuel ratio. A low voltage signal from the sensor indicates too much oxygen in the exhaust (lean condition) and a high voltage signal indicates too little oxygen in the exhaust (rich condition).

The sensors are threaded into the dual converter Y-pipe. Heated oxygen sensors are used on all models to allow the engine to reach the closed loop state faster.

Heated oxygen sensors are located in the dual converter Y-pipe both before and after the catalyst.

Testing

1. Disconnect the HO2S.
2. Measure the resistance between PWR and GND terminals of the sensor. Resistance should be approximately 6 ohms at 68°F (20°C). If resistance is not within specification, the sensor's heater element is faulty.
3. With the HO2S connected and engine running, measure the voltage with a Digital Volt-Ohmmeter (DVOM) between terminals HO2S and SIG RTN (GND) of the oxygen sensor connector. Voltage should fluctuate between 0.01-1.1 volts. If voltage fluctuation is slow or voltage is not within specification, the sensor may be faulty.

This will help.

Thanks.

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