You have not identified the vehicle and the locations are vehicle specific.
There is more than one sensor.
Typically on a single exhaust engine there will be one on the exhaust pipe running off the exhaust manifold and a second sensor on the exhaust behind the catalytic converter.
On a V6 or V8 engine with dual exhausts, typically there will be 4 sensors - one on each exhaust pipe leading off each exhaust manifold and one on each exhaust pipe after each of the catalytic converters.
Removal & Installation
3.5L
WARNING
When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
Fig.
Fig.
Testing
NOTE
Allow the O2 Sensor to cool down before conducting the test. The O2 Sensor voltage should stabilize at 5.0 volts. Raising the hood may help in reducing under hood temps quicker.
P0141....O2 Sensor Heater Circuit (Bank 1 Sensor 2)
P0142....O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
P0143....O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
P0144....O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
P0145....O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
P0146....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
P0147....O2 Sensor Heater Circuit (Bank 1 Sensor 3)
P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)
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