Clean the tube. Clean the tube. Clean the tube. It is located on the LH side of the engine. After removing the end of the tube I used a wood screw to clean the carbon build-up and the fault code did not reappear after reset. Please search the posts to define exactly where the tube is attached - I want to say the exhaust manifold. You access the tube from underneath the car.

I did this many times on my 95 E320.

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Tom Latos
2002 E320
1995 E320 Sold at 288kmiles