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Q: Instrument cluster is blinking d4 speedometer isn't workin and check engine on 1998 Honda Prelude

D4 green light flashes
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The d4 light flashing is the warning light for the transmission .
The warning light along with the speedometer not working usally indicates that the vehicle speed sensor is not working .
The speed sensor is located on the top of the transmission and mounts on vertically .

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