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The PCM relay in a 2009 Lincoln MKS helps the PCM by maintaining electronic connections. It's usually located under the passenger-side seat flooring or directly under the seats. Occasionally, mechanics or during servicing, the relays can be placed there too. If you can't locate the relays or the PCM relay, check the owner's manual for guidance on identifying the components. This should simplify the process for you.
Typically, the PCM relay location for a 2009 Lincoln MKS is situated beneath the passenger side floorboard; however, in some cases, it may also be found below the seats.