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In a Volkswagen Jetta, if the code 7e8 pops up, it indicates a fuel intake issue. This indicates that the knock sensor in your car detected that the engine's rod rack is vibrating or rocking. Usually, there isn't a problem with the rack itself, but it might be the knock sensor's programming in the engine control module that needs to be recalibrated or replaced.
The transmission is indicated by the 7E8 code on the Volkswagen Jetta.