Where is the location of O2 sensor on 1994 Jaguar XJ6?

Answer 1

The oxygen sensor is located on the top side of the exhaust pipe, just ahead of the catalytic converter.

The Haynes book will suggest dropping the exhaust system at the header, but you can actually remove and replace the O2 sensor without removing anything else.

You'll need a box-end wrench or a LINE WRENCH (size according to the new O2 sensor) with a slightly angled "box" end, so you can reach up on top of the exhaust pipe. To get the wrench on the sensor, cut the sensor wires very near the top of the old sensor.

To install the new sensor, bring the whole wire/connector assembly down under the car. You can buy the whole sensor/wire harness assembly, but it'll cost you. In the alternative, just get the new sensor with 20 centimeter wires and splice the new sensor wires to the existing assembly (black wires are interchangeable, but match the white one to white). Then, if you don't have a LINE WRENCH, slip the the wire assembly through the wrench box and keep the wires out of the way as you install the sensor.

Then the clumsy/tricky part is twisting the new sensor with its wires in the opposite direction from the way you'll have to screw it into its threaded hole, so that when you tighten it the wires will "untwist" back to normal. When the new sensor is tight (but not too tight), feed the wires back out through the wrench box. Then run the wires back up over the transmission to their connection plugs. (I always tie a string to the plugs before pulling the wires down under the car, then just reattach when done and pull the wires back up where they started.)

This is a long description, but sure beats dropping the exhaust pipe.