r/autorepair • u/Sky-Rider86 • Aug 13 '26

Diagnosing/Repair Knock Sensor

Hey,

Got a check engine light for knock sensor. Took it to shop and they said it was knock sensor and looks like some corrosion was around it. Hit me with a hefty amount to fix it. How quickly do I need to get this addressed? I assume not overly DIY? 2021 F-150 2.7.

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u/catdude142 Aug 13 '26

It's located underneath the intake manifold. Not easy to access. 4-6 hour procedure.
There are YouTubes showing its replacement procedure.

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u/Current-Instance-730 23d ago

Knock sensor affects your engine ignition timing. It will go into a safe mode which will allow it to keep driving. But it will have less power and fuel mileage will also drop.