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Re: oxy sensor light on, and also heat is not working. I...
Oxygen sensors are located on the exhaust pipe in front and behind the catalytic convertor. There are more than one. If your check engine light is on, the code will tell you which sensor is faulty - I need that code to tell you the exact location.
Also really need to know the engine type to be more specific.
If your heat is not working there is probably a fault in the door mechanism that lets air pass over the heat exchanger under the dash. the switch is most likely at fault.
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Po131 is the code for the oxy sensor, the voltage is low to the sensor. The sensor is the bank 1 senor and I do not know where the is for sure so you can goggle the oxy sensor for bank one and it will tell you where it is. You will need to replace it . Hope this helps .
Crank shaft sensor Remove the driver side rear ignition coil bolts. Reposition the coil. Disconnect the crankshaft position (CKP) sensor electrical connector. # Use penetrating oil and allow the oil to soak around the CKP sensor prior to removing the sensor. You're looking at left, rear side of engine. CAMSHAFT POS. front side of engine on the drives side about half way up the timing cover, not hard to get to.
check for fault codes in ecm at a guess knowing this model well it will have logged a code for heated oxy sensor faults sometimes you clear the codes and they dont come back.if the light comes back then one or more sensors are faulty more than likely open cicuit heater element in the sensors there are 2 or 4 sensors on that engine depending on market spec. the norm is 4 you can compare the sensors with a multimeter to locate the faulty ones ideally you need a wiring diagram to do this. genuine jaguar ones are expensive i have changed all 4 in the past to cure this problem at a cost off over 1000 pounds the other likley causes are throttle body problems and air leaks but you normally get restricted performance warning showing hope this helps been a jag tech for almost 50years
If it is a three wire ox sensor then you must make sure that wires are hooked up right or it will not function and cause engine to run erratic. One of the wires are for the preheater in ox sensor so it must be hooked properly.