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Re: yellow emission light
To find a leak in a vapor hose, you may need a leak detector that uses smoke and/or dye. A 0.020" hole is the size of a pin. it can be a pain to find .This is about the best alternative. You will probably need a mechanic for that. I responded to this on your other post.
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Did the garage check the gas cap during the emission test? 90% of the time an evap leak turns out to be a bad gas cap. Or if someone had gas cap off while engine was running (pumping gas). Or if gas cap was not tightened all the way while driving. If this is the case, code saying evap leak, will clear after drive cycle self tests are done. Usually after 50 miles or more.(if the leak is solved)
in order to help you I would need to know what codes are causing the light to come on. If they replaced the gas cap I would assume that there is a large evap leak but the code will tell me this for sure.
You can pull the codes yourself with a code reader that you can purchase for about $50.
You can call you local parts store and see if they can do this for you.
since it has only been a week you can ask the dealer if they can check to see if the same code has returned. If it is the same code than they should be responsible for rechecking there work at no cost to you.
most common is to check that ur gas cap is tight and or needs replacement 442 evap emissions control system leak detected [small] 446 is evap emissions control system vent control circuit malfunction the gas cap will set off these codes if cap is good need to then check the fuel and vent lines for cracked or dried out or partial disconnection
try not to fill up the tank while the car is running. maybe there is a bad seal on the gas cap now. i would simply reccomend taking it to the nearest advanced auto part, autozone, jiffy lube...anything of that matter and get them to read the code for you[they should do it for free]. Make sure to write it down, come back here and let me know what it said. its probably not a big deal
No the flap inside the fuel filler pipe is just an anti theft device to make it more difficult to siphon fuel out of the tank. The most likely cause for the code it the fuel cap itself. If you don't get the gas cap tight after you fuel up, it can set a computer code and turn on the Check Engine Light. After you check to make sure the cap is on tight, clear the engine code and see if it comes back on. If it does then have the fuel cap tested to make sure that it doesn't have a vaccuum leak.
You have a leak in the fuel system somewhere or a bad evaporative system sensor, the way the system works is the control module for the emission system pulls a vacuum on the gas tank and lines to check for leaks, if it can't get a certain vacuum level for a specified time it decides there is a leak and the check engine light comes on. This may be covered under the Federal Emissions warranty, call the dealer and inquire if the Evap System is covered.