service light problems with gas cap

shadowiix · 03-17-2009, 12:13 AM

anyone have a solution or has a problem with the gas cap setting off the service light? what causes this and how do i get rid of it. i tried filling the gas tank all the way up making sure the gas cap clicks more than four times or so but soon after the light still goes off.

Mad Dragon · 03-17-2009, 06:10 AM

First, you should never 'top off' the gas tank on a car with evaporative emissions. It will flood the charcoal canister, causing damage to the system.

If the car is constantly detecting leaks in the system, you could have a leak or a bad DMTL unit.

shadowiix · 03-17-2009, 05:39 PM

are these leaks or bad dtlm common. the service light goes off after the tank is about 3/4 full.

03-17-2009, 12:13 AM	#1
shadowiix Second Lieutenant 20 Rep 204 Posts Drives: 128i Join Date: Oct 2008 Location: irvine iTrader: (0)	service light problems with gas cap anyone have a solution or has a problem with the gas cap setting off the service light? what causes this and how do i get rid of it. i tried filling the gas tank all the way up making sure the gas cap clicks more than four times or so but soon after the light still goes off.
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03-17-2009, 06:10 AM	#2
Mad Dragon . 27 Rep 932 Posts Drives: 2010 GTI Join Date: Mar 2008 Location: MD iTrader: (0)	First, you should never 'top off' the gas tank on a car with evaporative emissions. It will flood the charcoal canister, causing damage to the system. If the car is constantly detecting leaks in the system, you could have a leak or a bad DMTL unit.
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03-17-2009, 05:39 PM	#3
shadowiix Second Lieutenant 20 Rep 204 Posts Drives: 128i Join Date: Oct 2008 Location: irvine iTrader: (0)	are these leaks or bad dtlm common. the service light goes off after the tank is about 3/4 full.
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