What does 51 mean on my AlertMaxx2/Rego1? Permanently deleted user 23 October 2019 07:45 Follow '51' is actually an 'S1' code. Click here for more information. Related articles What does S1 mean and how do I reset it? How do I reset the service light/indicator on the AlertMaxx? My AlertMaxx2 has an E9 error code, what does it mean? Comments 0 comments Please sign in to leave a comment.
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