my ford focus battery went flat and now when i try to jump car i get engine system fault and error code with flashing lights of 1:6 . the car doesnt crank or attempt to start . any idea what 1:6 of flashing lights mean 

It's a communication error in the immobiliser circuit.

Try disconnecting the battery, charging overnight and see how it goes when refitted.

 

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the battery has no power as it goes flat normally 30 seconds after the boost . if it flat would disconnecting the battery help . i basically didnt drive it for 4 months as was working from home so it been flat for a long time 

thank you for quick reponce as well 

I reckon the options are try a conditioning charger or source a new battery.
It may have pulled down too far to hold a charge now.

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thank you i will get a new battery installed as it would lose charge before . was hard trying to find out what the error message meant online . thanks for quick repsonce 

i did have the car battery attached to another car today for a long time providing power and it still wouldnt crank and still reported same error . even with a constant supply from another car could the battery still be faulty ? . sorry for all the queestions thought i should ask 

Aye. The battey is shot.

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swapped the battery with a new one  and the problem persists i still get the same issue . have tried my main key and my spare same thing engine system fault and the 1:6 flashing lights . any ideas what i can do next