SES Light after Tighten Gas Cap Code

fdriller9 · 02-27-2010, 11:20 AM

So I had an SES light last week and had my car scanned by a local indy shop. The shop said that nothing was wrong and that it was because I disconnected the plug for the butterfly valve in the exhaust...BS. Anyway he cleared the code. A week later my car tells me to tighten my gas cap. But my gas cap was tightened and I even un-did it and then re-tightened it. After this showed up my SES came on again. I searched and found that the gas cap issue will trigger the SES light but will clear after a few days after the pressurization tests confirm a tight seal. Why is my car telling freaking out? Is the sensor going? If no codes come up after a scan then it has to be the gas cap sensor right? Seeing that SES light on my dash kills me!!!!

fdriller9 · 02-27-2010, 11:30 AM

Ohh and btw I have a low voltage code too. I think this is because my amp isn't turning off though...Something is up with the remote trigger on my LOC.

fdriller9 · 02-28-2010, 08:36 PM

Anyone?

Alexander · 02-28-2010, 08:40 PM

Your out of warranty I presume?

Wlew · 02-28-2010, 09:14 PM

My car does the same damn thing. It is so annoying. everytime I get gas, a few hours or a day later, SES comes on... I thought it was because of the PBX, and that freaks me out, but then figured it out. I also have the plug unplugged in the back. I also have the yellow "oil" light on, which turned off yesterday, then SES came on, then off, then yelllow oil again. pisses me off. Obviously need to change the oil, but still the SES light pisses me off.

sorry for the long post. just keep tightening then gas cap, and i guess deal with it. haha sorry I cant help, im doing the same thing.

fdriller9 · 02-28-2010, 09:55 PM

Quote:

Originally Posted by Aonarch

Your out of warranty I presume?

Yes. Hit I'm at 50,600. To the above poster...Your SES light goes off? I thought the SES light needed to be reset by either a shop, dealer, or a scan tool? I hate seeing this damn light.

e90pilot · 03-01-2010, 08:49 PM

I asked a tech about this one. The gas cap warning will give you 3 chimes before it just turns on your check engine light for good. The PCV and fuel tank vent system are connected. Any leak in the lines will cause it to throw a fault code. That exhaust flapper should not throw a code. There is no sensor on the gas cap. It's in one of the vent lines. The car will check the pressure on startup but only if it's not full. If the tank is full the system will wait until the tank drains a bit before it checks. You need your mechanic to check the PCV and fuel venting system.

02-27-2010, 11:20 AM	#1
fdriller9 Banned 252 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	SES Light after Tighten Gas Cap Code So I had an SES light last week and had my car scanned by a local indy shop. The shop said that nothing was wrong and that it was because I disconnected the plug for the butterfly valve in the exhaust...BS. Anyway he cleared the code. A week later my car tells me to tighten my gas cap. But my gas cap was tightened and I even un-did it and then re-tightened it. After this showed up my SES came on again. I searched and found that the gas cap issue will trigger the SES light but will clear after a few days after the pressurization tests confirm a tight seal. Why is my car telling freaking out? Is the sensor going? If no codes come up after a scan then it has to be the gas cap sensor right? Seeing that SES light on my dash kills me!!!!
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02-27-2010, 11:30 AM	#2
fdriller9 Banned 252 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	Ohh and btw I have a low voltage code too. I think this is because my amp isn't turning off though...Something is up with the remote trigger on my LOC.
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02-28-2010, 08:36 PM	#3
fdriller9 Banned 252 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	Anyone?
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02-28-2010, 08:40 PM	#4
Alexander Mad tyte EuR0 style boooi <--- Joke 212 Rep 2,472 Posts Drives: E30, E85, MKVI Join Date: Nov 2009 Location: Deal's Gap iTrader: (0)	Your out of warranty I presume?
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02-28-2010, 09:14 PM	#5
Wlew Major 77 Rep 1,116 Posts Drives: 2011 E90 335i Join Date: Sep 2009 Location: Washington, DC iTrader: (12)	My car does the same damn thing. It is so annoying. everytime I get gas, a few hours or a day later, SES comes on... I thought it was because of the PBX, and that freaks me out, but then figured it out. I also have the plug unplugged in the back. I also have the yellow "oil" light on, which turned off yesterday, then SES came on, then off, then yelllow oil again. pisses me off. Obviously need to change the oil, but still the SES light pisses me off. sorry for the long post. just keep tightening then gas cap, and i guess deal with it. haha sorry I cant help, im doing the same thing.
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03-01-2010, 08:49 PM	#7
e90pilot Freight Dawg 102 Rep 2,103 Posts Drives: E90 325i Join Date: Jul 2005 Location: Oakland, CA iTrader: (3)	I asked a tech about this one. The gas cap warning will give you 3 chimes before it just turns on your check engine light for good. The PCV and fuel tank vent system are connected. Any leak in the lines will cause it to throw a fault code. That exhaust flapper should not throw a code. There is no sensor on the gas cap. It's in one of the vent lines. The car will check the pressure on startup but only if it's not full. If the tank is full the system will wait until the tank drains a bit before it checks. You need your mechanic to check the PCV and fuel venting system. __________________ --Marcelo '06 Arctic Metallic 325i \| Sport Package \| 6MT \| Dinan Stage III suspension \| Dinan exhaust \| 330i manifold swap! Click here! \| Active Autowerke tune \| 135i Brake Calipers \| Deiselboost caliper brackets \| E46 M3 front rotors
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