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What sensor or part on a engine, if unplugged, will make the service light flash on and off?

A shady dealer at a auction I go to sabotages vehicles (Alters something to make them run rough and service engine light comes on and flashes, etc.) so he can get them cheaper. They mysteriously run good if you look at them way before the auction starts,


Any sensor or vac. line or a plug wire off all can cause rough running.

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