What does d1a9 fault code mean

https://www.fixya.com/motorcycles/t13250781-d1a9_fault_code_mean

P0113 is IAT sensor open/high and is it disconnected maybe

No idea what d1a9 is, not an HD DTC.

With a TSM if the four-way flashers flash 6 times shortly after the ignition switch is turned to ON you should check for DTC's that have been set. d1a9 is not a 2005 Sportster code.

check engine light on means some fault codes stored in your engine control module.
use this tool clear the fault code p1320.

If the check engine light is On that means there is a error code got set in the cars computer.Get your car scanned at auto-zone for knowing the exact fault code.The error will indicate the exact fault causing the engine light to remain ON.At autozone service center its free to get car scanned.-------- That's it.

this means a fault is occurring in the engine electronic controls or the emission control system, every time the fault occurs the light is set, when it clears the light goes off, there is a code set in the computers memory of this fault, go to the link below for instructions on how to retrieve that code.
http://www.extreme-check-engine-light-codes.com/GM%20OBD1%20Decoder.htm

Assuming you mean that you have a light resembling the shape of an engine, this means you are having an engine malfunction. If you live in the US, you can take your vehicle by an Advance Auto Parts store and they will read the engine code, free of charge, to find out what the problem is. When these lights come on in your instrument panel, they indicate a problem to you, but a Fault Code is also written into the computer of the vehicle and thus requires a Fault Code Reader to determine the exact problem. Hope this helps.