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That fault will cause a no start, it senses an unauthorized person is trying to start eh car. You need a shop to scan the system control module and see what is causing the fault.
28D6 HO-Protocol Failure coding missing means one of the modules is not communicating with the cars network that links all the modules. What symptoms do you have, cluster issues?.
you are good to drive if the engine light stays off after start up
if it came on during the drive and stayed on there is a fault
next service ask to check for old fault codes in memory
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