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Where is the COMMON RAIL fuel pressure sensor on E 420 CDI 2008?

The common rail fuel pressure sensor location on a 2008 E 420 CDI (W211 chassis) is on the high-pressure fuel rail itself. It's not always easily visible without removing some components. You'll likely find it near the center or towards the rear of the fuel rail, usually integrated into the rail or very close by.

To find it precisely, you'll need:

* A workshop manual: This is the best resource. It will have detailed diagrams and specifications.

* Access to the engine bay: You might need to remove some plastic covers or other parts for better visibility.

Important Note: Accessing this sensor often involves working with high-pressure fuel lines. Exercise extreme caution as fuel under pressure can cause serious injury. If you're not comfortable working on this system yourself, take it to a qualified Mercedes-Benz mechanic. Improper handling could result in a fuel leak and fire hazard.