on June 13, 2012, 8:11 pm, in reply to "Re: Ford Focus 2.0 2006 - Will not crank, immobilizer codes P1621, B2139 & U1900 #"
Hi
These later Fords are hyper -sensitive to battery voltage .
Sometime's a disconnect for a couple of minutes clear's the faults you describe ,I would start testing the battery.
Good luck 
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Ford Focus 2.0 2006 - Will not crank, immobilizer codes P1621, B2139 & U1900 # - Chris Jackson June 12, 2012, 8:23 am
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