It's Under the Hood

• When you release the latch and open the hood, look for the power steering reservoir in the 2003 E320 on the front of the engine on the driver's side. It has a black plastic rectangular housing with a black cap that is approximately two inches in diameter.
  
  

Check Fluid Level

• You can remove the cap to check the power steering fluid level. It should be full up to the full level indicated on the metal rod attached to the cap. If the level is low, add power steering fluid, and then replace the cap tightly.
  
  

Always Check for Any Leak

• It's a good idea to check under the vehicle for leaks after starting the engine and turning the steering wheel back and forth several times. If there are no leaks, you can drive safely.