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These relays tend to be in a fuse/relay panel under the hood on the firewall or inner fender wall. Auto Zone should have the Chiltons/Haynes repair manual for your auto that covers the make/model and year. It's a good book to have at any rate. It will tell you where the fuse relay panels are and what they contain.
I have a 2001 Silverado 1500 with the 4.8 that had the same error codes. It turned out to be intake manifold gaskets were bad. With the engine running spray some carb cleaner on the intake where it bolts up to the heads and listen for the engine to speed up. If it does you've got a leak. With mine I couldn't find the leak with the carb cleaner but after I replaced the gaskets the problem was solved. Hope this helps.
Try changing the air filter, the oxigen sensor is very sensitive to it, be sure to warm the engine in the morning, Jaguars uses "thin" oil, when parking, first turn off the A/C (affects the oxigen sensor too)
P1391 is a timing referance code, your timing is crucial to engine operation, this can be caused by the crank and or cam position sencer. If you changed these and the problem still exists, maybe you got ahead of yourself. These two (2) sencers run in conjuntion with each other, if one is out of whack for any length of time, The ECU will trip and pretty much say to itself, The Timing chain is broken, fix me! Also note that these sensers are typacaly LOW FAIL items. So on especially vehicles with the 2.5Ltr. V6, If you suspect a sencer is bad and you change it, might be a good idea to change both sencers and the timing belt since like all belts it may be streching.
The Oxigen sensor are in diferent kind.
1 -- With a single wire. " is only oxigen sensor"
2 -- With 2 wires " is only oxigen sensor"
3 -- With 3 wires " Is oxigen and heater sensor"
4 -- With 4 wires " is oxigen sensor and heater sensor.
5 -- with 6 wires " is oxigen, heater A/F sensor" normally Nissan)
Depend of the year of your car.
But all the car they are Bank 1 or single bank. Engine in line
4 cyl . or 6 cyl. And are identified sensor 1 bank 1 and sensor 2 bank 1. S11 or S21.
But all the Engines in V are bank 1 and bank 2.
Sensor 1 bank 1, sensor 2 bank 1, S11 or S21.
Sensor 1 bank 2, sensor 2 bank 2, S12 or S22.
Sensor one is alway before catalystic.
Sensor two is alway after catalystic.
If you have problen with the oxigen sensor you need to put a scanner to see the number of code, The number of code will give the especific sensor that you need to replace.
The code can be heater or oxigen. and can be refer to a the same sensor.
I hope this information work for youu.
Thank you for use fixya.