Looks like Lambda sensor fault,
Fault Code:- P1646 Indicates a Power-train fault
The fault is generally due to a problem in the Computer & Output Circuit area
Fault Description: ECM HO2 Sensor control malfunction -bank 1 upstream (1/1)
Action of ECM:- ECM Default:- HO1S 1/1 control circuit inhibited
After clearing the DTC, complete the Drive vehicle for 10 minutes
Check for a reoccurrence of fault DTC.
Possible Fault:- HO2 Sensor 1/1 heater failure HO2 Sensor 1/1 sensing circuit: short circuit to ground, short circuit to high voltage, open circuit ECM Failure
See http://www.bluejag.co.uk for more info
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as you can no such code exists for a jaguar ,contact code reader manufacturer
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