CODE 11 is a Transmission Control Unit Code
CODE 16 is sometimes a Fuel Filter Issue (due to starving the injectors for fuel)
CODE 17 is the Vehicle Speed Sensor (responsible for communicating with your Tachometer and speedometer) This also causes the D light to flash and on some Accords with a "sport shifter" the S light will flash.
11-Engine RPM (Ignition coil signal) open or shorted.
16 Fuel injectors
17 VSS - speed sensor
Changing your VSS is the cheapest place to start. It is located on the back of your transmission (workable from standing near your passenger side front tire). Remove your air intake tube to see it more clearly, it will be located on the trans below your thermostat housing. Unplug it, and use a 10mm socket, then wiggle it out. You can find a new one on eBay pretty cheap. After you change it, unplug your battery for a few seconds to clear your check engine codes.
The worst case is that your TCU had failed. Below is a description of that.
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