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Even if it is an import vehicle, you should contact a Toyota authorised workshop near to you.
The error describes a problem with the temperature sensor of the battery, this outputs a too high voltage. Usually these sensors work with a signal voltage between 0.4 and 4.5 volts, with more than 4.5 volts this error is output.
Some vehicles have a temperature sensor on the 12 Volt battery, this could also cause the error. This should be checked by the workshop on site to see if the system does not mean this sensor. The cost should not be higher than GBP 100-200.
But if it is the sensor in the high voltage battery, then the whole thing is irreparable, the high voltage battery would have to be replaced. The problem is that they are either not available or the cost is very high. Such a battery can quickly cost GBP 10k and more.
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