I think we are a bit muddled forget T1 or T4 both do the same thing for keys
You did not say if the remote plip still works as that is the bit that is coded to the car using the barcode and yes using T4 you can read existing bar codes already coded to the car and in that way match them to an existing key if necessary
However you say the car is imobilsed that is nothing to do with the barcodes or T4 it is purely down to the chip as said earlier this is not coded to the car by T4 and I supsect your chip is simply faulty.
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