Radio code ?
You can disconnect the battery without needing any code, the radio will be fine. But what you have to watch out for is the automatically closing drivers window, if you have one. It will need to be reset.
Be aware that it is strongly advised to disconnect the battery 12-15min after ignition has been switched off, i.e. after ECM went to sleep mode. Not following this may seriously mess up engine control module.
Qashqai J11, 1.6 dCi CVT, ThermaClear
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