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How to Remove and Clean the Urea Injection Nozzle on a Mercedes GLC

Model: Mercedes Classe G W4631st - Years: 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
Part: Checks and maintenance

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Video tutorial

In this video, you will see how to remove and clean the urea injection nozzle on a Mercedes GLC, which shows an error message regarding AdBlue, indicating the remaining range before the engine lock. The problem in this case is often that the nozzle spraying urea is clogged, and to resolve the issue, it needs to be cleaned.

The best approach is to lift the car and remove the shield located under the vehicle to access the exhaust system. The video shows which screw to loosen to expose the nozzle, and you will see how clogged it is. Simply immerse it in very hot water, at least 176°F, and the crystallization will dissolve completely; but be careful, you also need to remove the inner rim with a very thin tip to dissolve it completely; of course, the chamber must also be cleaned in the same way. Reassemble everything, and now you can get back on the road.


Updated on 16 October 2026 by ScegliAuto


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