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How to reset check engine light after gas cap left off

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The light should turn off by itself after a couple of drive cycles, if not go to your local AutoZone and they can erase the code for you for free.

Posted on Jul 04, 2010

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Check engine light is on duee to gas cap got new gas cap how do I reset


Remove the negative battery cable for 5 minutes or so and it should clear it.

Feb 16, 2013 | 2005 Toyota 4-Runner SR5

1 Answer

At first my gas cap light came on -- I tightened it several times-- now, the engine light is on-- I had someone at Advance Auto check and he said it was an emissions problem-- Can you help me with this?


The code needs to be reset. The code you got was most likely "emission leak medium" this happens if the gas cap is left loose. If the code is reset, and you tightened your gas cap it should not come back. If it does, then get back with me and I can walk you through some steps and parts that will have to be checked, but I am 99% sure its only your gas cap, Happens to me all the time, and I just reset it after tightening my cap. Thanks.

Mar 15, 2011 | 2006 Pontiac G6

1 Answer

Some body stolen the fuel gas cap frome my car,i drive 2 day w/out cap.when i see that im buy new gas cap,but tha chek engine come in on,what can i do to solve this problem?thanks


One of the problems that trigger a check engine light is either a faulty gas cap, gas cap not on all the way or no gas cap. Once you replace the gas cap you should be able to reset your check engine light or it may automatically adjust itself.

Feb 15, 2011 | Chevrolet Camaro Cars & Trucks

1 Answer

My check gas cap light is on but no check engine light came on


The check gas cap light was in response to complaints of the check engine light being on for loose/missing gas caps. So now when the PCM sees a large EVAP leak the first thing it does is illuminate the check gas cap light (on models equipped with the light). Since it doesn't know if the gas cap is on or not it can have other issues like a vent solenoid stuck open which the PCM would be unable to distinguish between that and the gas cap left off.

There will still be a trouble code in the PCM for the EVAP system.

Oct 05, 2010 | 2005 Buick LaCrosse

1 Answer

2006 Saturn Relay Check Engine Light


PO455 is a large evaporative fuel leak. A bad fuel cap is ONE of the things that COULD be the problem. Fuel system cleaning only lightened your wallet. Reading your post is confusing. Did all this start AFTER the Valvoline Wallet Flushing? If so , they left something loose or disconnected. I would find a qualified repair shop to fix the problem, and if it has anything to do with what Valvoline did, make them pay the bill.

Nov 12, 2009 | 2006 Saturn Relay

2 Answers

1998 sls service engine soon light stays on. autozone said code indicatted gas cap / air in gas should go out on its own but has'nt after 2 fillups


should reset after 100miles but if didnt was code from gas cap left off or is gas cap seal gone bad also the same code is for the evap system check canister and lines for cracks and damage or smell of gas

Sep 29, 2009 | Cadillac Seville Cars & Trucks

2 Answers

2007 Saturn Ion Check Engine Light Gas Cap Problem


Best to rent a scanner and check for other problems. If ok, the scanner will clear the light. If you bought a vented cap, the trouble will remain until a sealed cap is installed.

Aug 17, 2009 | 2007 Saturn ION-2 Quad Coupe

1 Answer

I am getting a tighten gas cap message, however cap is on and tight. Check engine light is on


The gas cap is most likely faulty. The gas cap is an integral part of the evaporative emission system. If it is not sealing or venting properly, it can affect the proper operation of this system. I would replace the gas cap and have the check engine light reset at an autoparts store. Most stores will scan/reset computer for free. Hope this helped and best wishes.

Aug 07, 2009 | 2007 Chevrolet Impala LS Sedan New Cars

2 Answers

Check engine light keeps coming on replaced gas cap already


Your problem is in the evaporative emission system which is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. The light coming on can be caused by one of the following:

1. Defective or loose fuel cap
2. EVAP canister or hose cracked- not connected
3. Purge or vent solenoid defective
4. Vacuum leak at engine Government regulations require on-board testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics. You have tried the easy fix, the gas cap. Finding the leak now will require special equipment and testing procedures, might be better left to a professional.

Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!

Mar 18, 2009 | 2003 Dodge Caravan

3 Answers

Check engine


to reset the sevice enine soon warning light you need to disconect one of the battery terminals for a least 10 seconds yo reset the computer.

Sep 20, 2008 | 2002 Chrysler 300M

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