Question about Mercedes-Benz C-Class
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Posted on Aug 23, 2008
The EPC light means something is wrong in the drive-by-wire path, the "gas pedal" potentiometers or the electric motor-controlled throttle body, etc.
Posted on Aug 23, 2008
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Posted on Jan 02, 2017
Just had a similar problem. Took my 2003 Volkswagen Jetta 2.0l auto in for an oil change. They also checked the air filter. When finished, I started it up and the EPC and MIL (aka CEL, check engine light) lamps came on.
Figured it was just a glich caused by draining/refilling the oil and that it would reset itself by the next day. No luck. So, after checking to make sure the gas cap was tight, I poked my head under the hood. Made sure the oil fill cap was on tight. They also checked the engine air filter so I took a look over there. Low and behold, the ding-a-ling at the shop neglected to reconnect the MAF sensor cable. That is the electronic connector on the air intake hose between the engine and the air filter box.
Plugged that back in and bing, EPC light went out. MIL still on, but if I recall, after a "major" event, the MIL won't go out until it is reset. Taking it back to the shop to have the code cleared.
So, long story short, if you get an EPC and MIL, first check to make sure that the MAF is properly connected.
Posted on Sep 03, 2009
The EPC light is connected to a pressure sensor in the block. Open the oil filler cap, release the pressure (and check your oil while you're at it). If you don't have a real problem, the light should go out.
Posted on Jul 10, 2010
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