Hello I will be glad to help you with your Honda questions today!
Have you attempted to clear the codes to see if they will come right back on? The 5-1 and 6-4 codes are very likely due to low battery voltage.........if the codes reset after clearing it would be due to a faulty SRS unit.
hi,if it is a low battery voltage,which I suspect,what could be causing it and how can I remedy it?
If the battery has a weak charge which I suspect I would replace the battery first and then have the charging system checked as the alternator may not properly be charging the system.
If the alternator is what is causing the battery to go dead then you would need to replace the battery and alternator to correct the problem.
Let me know if you have any other questions and I will be glad to help. Please remember to rate me at Excellent Service and Thank You for letting me assist you today!