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These Accords have common problems with both the instrument clusters & the speedo drive Transducers. It is the Speedo Transducer I would head for first though,it is located on the top rear of the transmission, over the diff assembly. This is in between where the driveshafts enter the transmission. It is held in by 1 x 10mm bolt & has an electical connector clipped in to it which from memory has 3 wires. The connector is somewhat triangular in shape & should be black. Check that this is not full of coolant from your recent thermostat change, however I doubt that this is the problem as they are sealed pretty well. The chances are it is just faulty. This unit creates an electrical pulse which tells both the speedo & the transmission computer how fast the vehicle is going. Without it the transmission computer will register a fault (D4 lamp flashing). It also informs the engine computer that there is a problem which will activate the Check Engine Lamp.
When the D4 light flashes that is an indication of a problem with the
transmission. You need a speed sensor located on the transmission make sure to get the electrical part ths will solve BOTH problems.