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Q: The power door locks don't lock, either by the door switch or the key fob

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power locks began to fail sporadically, won't lock by door switch or key fob. will unlock ok, key in door will only lock driver door. had mech change 3 bypass units and I signal receiver, worked ok for 5 days then stopped. any suggestions?

My car has 156000 miles.
My car has an automatic transmission.

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