Where is northstar engine oil sensor unit?

The location of the Northstar engine oil pressure sensor varies slightly depending on the exact year and model of the Cadillac vehicle equipped with a Northstar engine. It's generally found on the engine block itself, near the oil filter. However, it's *not* always directly on the oil filter housing.

To find it precisely, you'll need to consult a repair manual specific to your vehicle's year and model. A Haynes or Chilton manual, or a digital version from a source like AllDataDIY, will provide diagrams and precise locations. Using a search engine with your vehicle's year, make, model, and "Northstar oil pressure sensor location" will also likely yield helpful results, including images and forum posts.

Important Note: Before attempting any work on your engine, always ensure the engine is cool and disconnect the battery's negative terminal.