oxygen sensor

[Lee250]

My camry hs hit 192,000 miles an I'm 99% sure it the original oxygen sensor. The car runs great and I get about 30 mpg. Should I change it?

[Doctor J]

if you have analog voltmeter that reads DC on 0 to 10 volt scale you can check the O2 sensor's operation.

[malayan]

Reading should be what on the O2.

Checking mine too!

THanks

[Doctor J]

One procedure works like this:Warm up the engine to normal operating temperature.
Connect the voltmeter to the service connector. Put jumper between terminals T and E1. Connect the positive probe to the Vf terminal and the negative probe to the E1 terminal.
Run the engine at 2,500 rpm for 90 seconds or more. This allows the sensor to achieve a stable temperature and the exhaust flow to stabilize.
Maintain the engine at 2,500 rpm and check the meter. The meter needle should fluctuate 8 times or more in 10 seconds within a 1-5 volt range. This indicates that the sensor is working properly

[jasonck08]

Just replace it. It only costs $30 for a brand new BOSCH oxygen sensor... I purchased a new one, and it has already payed for itself. I got aprox 2MPG better with the new sensor. Was stuck at 25-26MPG. Now I can hit 28-29MPG.

[Doctor J]

The oxygen sensor is not routine maintenance item and it takes less then 10 minutes to check it.

[Dulluthkid_19]

Originally Posted by Doctor J

if you have analog voltmeter that reads DC on 0 to 10 volt scale you can check the O2 sensor's operation.

What if you only have a digital multimeter? Or do you absolutely need an analog readout to watch the quick jumps in voltage?

[Doctor J]

Some advanced digital onnes can measure max and min value and how often they are changed [frequency]. The simple digital such as 'radio shack' will not work. I using the cheapest pocket analog for this purpose.