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What does a blinking d4 light mean on 1992 Honda Accord station wagon?

The D4 light on a 1992 Honda Accord station wagon is the indicator for the 4th gear of the automatic transmission. If this light is blinking, it indicates that the transmission is not properly engaged in 4th gear and may be slipping out of gear. This can be caused by a number of factors, including:

1) Low transmission fluid level

2) Worn or damaged transmission gears

3) Bad transmission solenoid

4) Failing torque converter

5) Defective transmission control module (TCM)

It is important to have your vehicle inspected by a qualified mechanic if the D4 light is blinking to determine the cause of the issue.