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Mercury Grand Marquis: 
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On Thursday the Check Engine light went on again. The codes were PO174, 1151, 1131, 171. The mechanic was reluctant to fix it. He suggested bringing the car to the dealer...more

So the first thing to do is confirm that the unit you have installed is the correct upgrade. Aside from that, the fact that the brakes release when you pull up on...more

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