Chevrolet Repair: O2 sensor 97 chev astro, volt ohm meter, sensor circuit

Question
I have a code P0143 sensor circuit low voltage Bank 1 Sensor 3  Is there any way to find out where these sensors are located and which one would it be.

Answer
Hello Sam.....The sensors are located on the exhaust system. In your case you will find 4, I believe. The number one bank is the drivers side and I belive number 4 is the rear one. You can check these sensors with a scanner . All the sensors produce a millivolt current to tell the computer what needs to be adjusted for emission purposes.You can check these with a volt/ohm meter but a good scanner with a good ''data'' stream is the best way to find the one at fault. With the scanner you are able to watch the sensor ''working''..I hope this helps...Best