Where is the transmission reservoir on the 1999 E320?

Question edited for a lot more clarity.
Question moved to model category.

Did you have the radio or CD on when you were doing all this work? Low battery voltage can cause it along with other reasons.

https://www.google.com/search?q=1999+E320+BAS+ASR+light+on

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Heres an a pic that will help. The transmission has no reservoir, but has a dip stick. This is also the location for adding transmission fluid. You must use a very slim funnel.

Hi, you should use the "special" MB fluid, 8 liters is required.

check your clutch hydraulic reservoir fluid level. If empty, you have a leak. Find the leak and get back to me for repair steps.

I have two Mercedes - one is 2000 E320 Wagon; other is 1999 E320 Sedan.

I replaced the serpentine belt on my 2000 Wagon today at 92,000 miles. I found that the Motorcraft JK6-947 could be purchased on Ebay for $12.99 plus $6.20 shipping. The old belt was a Goodyear Gatorback 4060940. My 1999 sedan has a Mercedes Benz 011 997 97 92 6K2390 EM7117 Gates belt made in Spain.

Here are the details of replacing the belt.

On the 2000 E320, a 17 mm bolt just under the belt going to the tension pulley will release the belt tension when turned counterclockwise. Removal of the belt was easy after using a 17 mm deep socket wrench similar to a spark plug socket. I made turning the bolt very easy by slipping a 4' pipe over the socket wrench handle. It is advisable to put the new belt LAST on the idler pulley that contacts the belt only on the smooth side.

You do not need todisturb theButton Torx bolt in the center of the tension pully.

The 1999 E320 uses a 15 mm bolt in the CENTER of the tension pulley. Otherwise the installation is the same as the 2000 E320.

sorry but your going to have to take it to the dealer to get that light reset.

replace the light switch

If oil is geting in the coolant, you most likely have a leaking head gasket. there is one other item it could be if it has an automatic transmission, and that is the transmission cooler in the radiator, if the cooler is leaking it will allow transmission fluid to mix with the coolant.

Most likely a gas cap or emissions issue, if you are sure the car is running fine. But you will have to have it scanned to know for sure.