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The crankshaft position sensor in a 2011 Nissan Sentra is located under the vehicle's hood. Begin by opening the driver's door and pressing the hood release button, then prop open the hood. Next, direct your attention to the back of the engine block—consider using a stool for better access. The sensor is positioned between the firewall and the rear of the engine. If a replacement sensor is required, expect to pay between $25 and $55. Opting for an OEM part may be pricier, but it's advisable due to its quality.
The crankshaft position sensor for a 2011 Nissan Sentra can be found at the back of the engine's cylinder block.