Will Moderate For Cigars
Date registered: Apr 2005
Vehicle: 2002 ML320, 2005 S430 4MATIC, 2010 F150 Crew Cab
Location: City on the TN River
Mentioned: 3 Post(s)
Quoted: 200 Post(s)
RE: Check engine light - 1999 E320 - gas cap?
I understand that it takes three on-off positions to clear the check engine light after the problem has been corrected. An on-off position is classified as a start and drive for 5 to 10 minutes for the computer to run it's internal diagnostic to make sure the problem has been corrected. If your light is still on after 3 or 4 days of driving, then you have another problem.
You can take your car to Advance Auto or Auto Zone and have an OBD II diagnostic run free of charge (dealer charges 70 to 100 bucks). They can tell you the codes and what they mean. Oxygen sensors and Mass air flow sensors are notorious to fail in Mercedes and one of these is most likely the problem.