Tees Posted March 30 Share Posted March 30 I have a Ford focus, 1 L eco-boost ST line engine light keeps coming on and I get a fault code p164c internal control module start stop performance fault, it says to check wires are in properly and there is no corrosion. All the ground wires are connected firmly which I have done what the problem is still there Quote Link to comment Share on other sites More sharing options...
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