Blinking D4 drive gear in the dashboard

Check out the link. Winter/ Snow/ Sport or gearbox fluid change. Get it checked for DTC codes.

https://www.google.com/search?q=Peugeot+206.+gear+light+indicators+on+dashboard+to+be+blinking

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you have problem with your transmission computer located under your dashboard behind your radio comparment i had the same problem replaced that for a used one or rebilt one and solve
just make sure they sincronized again with transmission

You will need to have the Tranny checked to see if it is a TCU or a bad solenoid in the Tranny.

A blinking D4 light on a honda is an indicator that the computer has determined there is a fault within the transmission. You would need a scanner to communicate with the pcm and read the fault codes.

This is involved. When the D4 light blinks, it is indicating a problem with the input or output systems for the A/T. If you find your Service Check Connector (it should be near or at the top of the kick panel on the passenger's side; it's usually blue and has two holes in it; it is at the end of a wire so don't look for a fixed unit; it is often simply tucked in behind the top of the kick panel. You should pull the kick panel out to find it) you can insert a paper clip so that it connects the two holes. Then, if you turn your ignition to ON II (do not start the car) the D4 light will blink out a code, using both long and short blinks. The blinks have to be carefully counted. Problem codes 1 through 9 care indicated by short blinks. Problem codes 10 through 15 are indicated by a series of long and short blinks (you have to add them together to get the code).

I tell you all this to indicate that the procedure is fairly involved, and since you probably don't have a list of what the codes mean, I would have to say that it would be best to find, if you can, a Honda dealer to read the codes and check your transmission. Most of these problems are connector or sensor related and are usually indicated by the transmission not shifting from one gear to another, or by the transmission jerking hard when it shifts. If your having no problems and you are in a position to not have access to a Honda service department, you can find the backup radio fuse in your engine compartment fuse box and take it out(not with the car running) for 10 seconds or so, then put it back. It will clear the computer. If the D4 starts blinking again, it would indicate that the warning was not just a glitch.
I really hope that this is helpful; I'm sorry if it is only disheartening.

when it is blinking it should have some codes stored have someone with a scanner get the fault codes this indicates a problem within the transmission may be a speed sensor does your speedometer work ?

this indicate a transm. failure, begin to check fluid transm. level.

it sounds like the tranny fluid is low or it needs to be changed i really think its low!

TRY WHAT THAT OTHER PERSON SAID. IF THAT DOESNT WORK POP UR HOOD OPEN AND SLAM IT DOWN. ONE OF UR SENSORS ARE DIRTY OR LOOSE SAME THING HAPPENS TO MINE.

The D4 light blinking is the vehicle computer telling you there is a transmission malfunction and transmission codes are stored in the computer's memory.The codes have to be pulled out manually unless it has an OBD2 connector.A transmission shop or Honda dealer can pull the codes.