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Jaguar XKR 4.0 SC code P1646


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Hi All, 

I have a 2001 Jaguar XKR AJ61 engine with code P1646 coming up.

All 4 O2 sensors have been replaced,  its had both fuel pumps replaced but still have the code! 

Any help would be appreciated!

I'm on the brink of sending the ECU for testing.

Many thanks in advance.




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