Component Location Overview
In this video, I provide a clear and direct look at the location of the Knock Sensors for the 2015–2018 Lincoln MKC with the 2.0L EcoBoost engine. On this turbocharged engine, you have two knock sensors (Sensor 1 and Sensor 2) mounted directly onto the engine block, usually in the “valley” or along the side of the cylinder block. These sensors are vital for the EcoBoost platform, as they allow the Engine Control Module (ECM) to monitor for engine detonation (pinging) and adjust ignition timing accordingly to protect the engine while maximizing turbo boost performance. This guide will help you pinpoint their specific mounting points, which are often nestled among the intake manifold runners and various cooling/vacuum lines.
Benefits for DIY Repairs
The knock sensors are essential for maintaining the performance and safety of your turbocharged engine. If they fail, the ECM will typically default to a very conservative ignition map, resulting in a significant loss of power, reduced fuel economy, and potentially “limp mode.” Replacing these sensors yourself is a highly effective way to restore your MKC’s performance, and since professional shop labor to access these sensors can be high, doing the work yourself offers excellent value.
Common Symptoms of Failure
A malfunctioning knock sensor usually results in:
- Check Engine Light: You will likely see codes such as P0325, P0326, P0327, or P0328, which explicitly indicate a circuit or signal range error for the knock sensor.
- Significant Power Loss: The car will feel sluggish or unresponsive because the ECM is limiting timing to protect the engine from potential detonation.
- Reduced Fuel Economy: Incorrect timing adjustments forced by a faulty sensor will often cause the engine to burn fuel less efficiently.
- Engine “Pinging” or “Knocking”: You might hear audible metallic tapping or pinging noises under heavy load or acceleration if the sensors are failing to detect and manage combustion issues.
Safety Precautions
Because these sensors are located in a dense area of the engine, follow these precautions:
- Engine Cool: Ensure the engine is completely cool. You will be working near the intake manifold and various coolant lines, and you don’t want to risk burns.
- Prevent Debris: Because you will likely be working near the intake ports, it is critical that you clean the area around the sensors with compressed air or a clean rag before removal. You do not want any grit falling into the engine if you have to remove other components to gain access.
- Wiring Integrity: The wiring harnesses for these sensors are exposed to extreme heat. Ensure you do not pull on the wires; use a pick tool to release the connector tabs, as they are often heat-hardened and brittle.
- Torque Correctly: Knock sensors are “piezoelectric”—they are sensitive to vibration. When you install the new ones, ensure they are torqued exactly to the manufacturer’s specification. Do not over-tighten them, as this can crush the internal crystal and cause the new sensor to fail immediately.
Expert Support
I am a mechanic with extensive professional experience in automotive diagnostics and repair. Because these sensors are buried on the EcoBoost engine, sometimes the hardest part is simply getting the intake manifold or wiring harness moved out of the way. If you have questions about the torque sequence or need help distinguishing between Sensor 1 and Sensor 2, please leave a comment below. I am here to help you get your MKC running perfectly again.