Why is the D4 on my dash blinking in my 1994 Acura Legend L?

The blinking D4 light on your 1994 Acura Legend L typically indicates a transmission issue or a malfunction in the automatic transmission system. It could be triggered by low Transmission Fluid, a faulty sensor, or an electrical problem. It's advisable to check the transmission fluid level and condition first; if everything seems normal, consider having a professional diagnostic performed to identify the specific issue. Ignoring this light could lead to more significant transmission problems down the line.