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A10A is "EWS4 timing response/challenge" issue reported by CAS; this is about theft control - the DME and CAS must communicate and exchange a code (SK or ISN) or, while the CAS will allow the starter to function, the DME won't provide fueling or ignition to let the engine start.A0B4 is the CAS reporting an issue with the starter, basically timing out because you are cranking so much without starting.Proper diagnosis of this problem will probably involve a serious learning curve for you. Even of the CAS were bad, you cannot just replace it - non-trivial programming is required to mate it with your DME. In any case, the problem may be just a failed relay, fuse (F4 and/or F51 in the junction box) or corroded wire or connector.
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