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In a 1993 Honda Prelude, a blinking D4 light typically indicates a transmission issue, often related to the Vehicle Speed Sensor (VSS) or the Transmission Control Module (TCM). The VSS monitors the speed of the vehicle and sends this information to the TCM, which can cause shifting problems if faulty. It's advisable to check these components and their connections, as well as perform a diagnostic scan for any trouble codes to pinpoint the exact issue.

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1w ago

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