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The 2011 VW Jetta is equipped with two knock sensors located at the rear of the engine block, beneath the exhaust manifold. These sensors are designed to detect engine knocking or unusual noises that may not be audible to the average person. Knocking sounds can be a sign that something is amiss with the vehicle and that the engine may be at risk of failing. If the knock sensor triggers a trouble code, it is important to have the car inspected to prevent potential engine damage. Neglecting this issue could result in serious harm to the motor. The replacement cost for knock sensors is typically around $300, so while it's not cheap, it's a manageable repair compared to other potential issues.
The knock sensor in a 2011 VW Jetta can be found on the passenger side of the engine block.