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This step will be different for every system
To locate bank one / sensor one, the key is to identify the # 1 engine cylinder.
In a V-type motor, sensor one (s) are in the exhaust system before the catalytic converter.
In an inline motor, the rear sensor (or sensor two) is in the exhaust system after the catalytic converter
Using a 10-megaohm digital voltmeter Hook up the voltmeter's red probe to the sensor’s signal wire and the black probe to engine ground. (use back probe method, DO NOT pierce the wire)
Start the engine and let it idle for about two minutes while watching the digital reading on the voltmeter.
After two or three minutes, the voltage reading will begin to fluctuate between 0.1 and 0.9 volts.
Record the lowest and highest voltage reading from the voltmeter in any one-minute period.
Replace the oxygen sensor if the voltage:
Open and close the engine throttle with a quick motion.
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