To reset the EGR light on a 1987 Subaru GL Wagon, you typically need to disconnect the battery for a few minutes to clear the engine control module (ECM) memory. Alternatively, you can use an OBD-I scanner to clear any error codes related to the EGR system. Ensure that any underlying issues are resolved before resetting the light to avoid it coming back on. Always refer to the vehicle's service manual for specific procedures.
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