i can tell you which one it's not and that is the black with white stripe that one is a ground.hope this helps at all.
there are 2 oxygen sensors on your vehicle. The first is located close to the engine, in the exhaust pipe. Look for the wire that leads to it, that will help you find it. The second is right after the catalytic convertor. Again, look for the wire that leads to it. The both come out by turning it counter clock-wise. Disconnect your battery, unplug the wiring harness to the oxygen sensor and remove it. After you put the new one in, re-connect the wiring harnes and re-connect your battery, and your done.!!
P1646 is a fault in the heater or sensor of the upstream O2 sensor. It is the light grey plug on the firewall behind the engine and leads to the sensor unit itself on the rear bank exhaust pipe. A replacement sensor is between (UK) £65 and £120 depending on where you go. Beware of the generic 4 wire sensors as their specs are not quite up to Jaguar's. BTW. It's a b*tch to get to and you need a 22mm socket with a slot for the wires to go through.
It depends what kind of sensor and how it is wired.Usually the "sensor ground" refers to the ground source at the sensor's plug. Usually that leads back to the ECM. Sometimes it's the threads where the sensor screws into the vehicle.If a wire brakes or corrosion builds up between parts the resistance can change, thus why measurements are taken from sensor ground.
It is located under the Upper Timing Belt Cover on the passenger side of the of the engine. You will see a wire running through the upper cover, this leads to the Camshaft Position Sensor. Another wire runs through the lower cover and this leads to the Crankshaft Position Sensor. Just remove the upper cover and with a flashlight you will see it bolted (2 bolts) next to the Camshaft Pulley.
Probably the vehicle speed sensor located in the transaxle extension housing, or a wiring fault up to the cluster are the cause of the problem. If the speed sensor is faulty, you will also have a fault code 15 stored. See the linked page for more information on how to get the codes. If there is no code for the speed sensor in memory, you may have a wiring fault. The speed sensor signal is carried on a white/orange wire in the left side connector on the digital dash. It splices to a wire of the same color leading to the connector for the traveler/navigator trip computers, and leads to a large 8-way connector forward of the left (drivers side) shock tower. From there it runs down to the distance sensor. Check continuity between the connector in the dash and the 8-way connector. If you have continuity, then your digital cluster may be at fault.
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