Knock Noise from Steering When Turning, Going Over Bumps on Mercury Mariner

A defective power steering return line can cause a knocking noise when turning or going over bumps, especially when the engine has reached normal operating temperature. The power steering return line should be replaced.

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Average mileage: 90,333 (36,000–120,000)
4 model years affected: 2005, 2006, 2007, 2008
7 people reported this problem
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Knocking noise from steering area when going over any bump.