Honda FI-light blink-code decoder
Read the FI (check-engine) light without a scan tool. Enter the long and short blinks, tap in time with the light, or point your camera at it, and get the Honda fault code with a link to what it means.
New to this? How to read the FI light · How blink codes work
Tap a button for each blink you saw. Long first, then short. Use Pause between separate codes.
Watch the FI light. Press and hold this button while the light is on, and release when it goes off. The decoder classifies each hold as a long or short blink.
Point your camera at the FI light. Video is analysed on your device only: nothing is uploaded or saved. The camera stops when you leave this tool.
No camera? Use or instead.
How the blink code works
When the FI (check-engine) light flashes a code, it counts in two blink lengths: a long flash counts ten, a short flash counts one, and the long flashes always come first. So two long flashes then three short flashes is code 23.
The blink gives you the major code, which is the system at fault (for example 21 is the oxygen sensor). The exact sub-fault, like 23-01 versus 23-02, is not blinked out: that comes from reading the codes with a diagnostic tool. This decoder takes you to the major-code page, which lists the documented sub-faults.
If the light repeats the same pattern, that is normal: it is one code repeating. A longer pause before a different pattern means a second stored code. Full detail is in the blink-code guide.