Question about 2003 Toyota Highlander

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How to clear codes/check engine lite

I have a check engine light on and found my gas cap loose. I secured it 3 days ago and the light still remains on. If that was the problem, will I have to drive more "drive cycles" to have code/check engine light cleared, or will I have to clear the code with a scanner (or other method). Thanks, John K

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  • jkawasaki Dec 21, 2008

    Thank you for the great information. Yes, this "reset" did erase the code successfully and after securing the suspected loose fuel cap, the check engine light has remained off.

  • Anonymous Mar 28, 2014

    the drive cycle will not clear codes for inspection, check engine light and abs lights come on when driving

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Under the hood on the left side is a fuse panel, if there is a single EFI fuse, remove it for 30 seconds or so, if there is more than 1 efi fuse remove them both along with the fuse marked e.t.c.s. leave them out for 1 minute or so and that will erase the code and reset the light. make sure the key is switched off before removing fuses

Posted on Dec 20, 2008

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Error code 340 & 457


  • P0340 - Camshaft position sensor circuit malfunction.
  • P0457 - Evaporative emission control system leak detected (fuel filler cap loose/off)

    There is a bulletin #0398 posted on 05/12/2003 for P0457 - Malfunction indicator lamp (mil) illumination with diagnostic trouble codes p0442, p0455, p0456, p0457, p1442 or check fuel cap lamp illuminated with diagnostic trouble code p0457.

I'd suggest checking with your local dealer, as it may be a fix that is covered by the dealer.

Oct 21, 2012 | 2002 Ford Focus

1 Answer

My check engine light came on. Just a couple of days ago the digital display said my gas cap need tightening. I twisted it but did not remove it and then put it back on. I was told that if the gas cap...


yes it could ! this is part of the emission system on todays vehicles. if your sure you do not have a hole in a emission hose. just replace cap, the seal may be bad on cap. then drive it. light should go out if this is the only problem. good-day ! check all lines and hoses in system. remove cap completely and replace it. this may fix problem.

Sep 12, 2011 | 2007 Chevrolet Avalanche LTZ

1 Answer

I have a 2006 Saturn Relay with just over 70k miles. The "check gas cap" came up on screen after a few days the check engine light came on. was at a friend's who has a code reader and he...


The P0455 code indicates a leak in the evaporative gas system.

A loose, improprely seated, or defective gas cap will set the code in the computer.

Insure the gas cap is on and working as it should most caps gives a ratcheting clicking sound when seated. Inspect the cap for any damage and if found replace it.

If in doubt replace the gas cap.

Aug 03, 2011 | 2006 Saturn Relay

1 Answer

Car runs very ruff. computer says small emissions leak.I have replaced gas cap, this helped for 1 day. now check engine lite is on again.


Did you erase the code after you repaired the problem ??..Emission leaks are usually not affective
to the engine performance...But a gas cap is for some reason...You actually need an emission
leak tester hooked to it ...Or a DRB III eng. analysis tool....I am chrysler tech.....
But normally emission troubles wont make it run rough unless it is very bad !
It may be your O2 sensor.Doublecheck gas cap security.....make sure old code is cleared before you make any more adjustments....Check engine for any vacum leaks...This could be the problem....Because it shouldnt run good for a day after changing only the gas cap...
Make sure all electrical connections ( PLUGS/WIRES/INJ.CONNECTIONS...etc..) are good...
You may have to take to dealer to clear codes and recheck.....Maybe update PCM
Hope this helps.......................................Level II CHRYSLER ..................Metalpoet

Apr 17, 2011 | 2002 Dodge Stratus

1 Answer

P1456


code P1456 set when there's small leak in the fuel tank system.
Most known reason for P1456:
-Didn't tight fuel cap on until it click for more that 3 time after fueling up and drove the car too long with cap loose.
-or a bad gas cap.
I'll try tighting the gas cap.
clear check engine.
if code come back, replace gas cap and clear check engine light again.

Dec 15, 2010 | 2001 Honda Odyssey

1 Answer

The engine light appeared in the message center; however, the vehicle seems to operate fine. This happened once before and no problem was identified, technician reset the light. The first occurrence was...


Try checking your gas cap for tightness. If it recurs, try to replace the gas cap and see if that corrects it. You can stop by most Autozone's for them to check the vehicles computer codes and on many occasions you'll find that "Check Engine Lights" are due to "Emissions" issues. And many of those can be attributed to loose gas caps.
Good luck, DWtsn

Oct 04, 2010 | 2005 Chevrolet Tahoe

3 Answers

How to reset engine check light for loose gas filler cap


Just disconnect the NEG battery terminal for 10 minutes and the Code should clear. Or you can get a free scan at Autozone or Oreillys and they will use their scanner to clear your computer.

The advantage with the scanner is you will not lose radio station Presets or security codes.

Sep 13, 2010 | 2005 Chevrolet Equinox

2 Answers

@004 Pilot the check engine light came on after my daughter bought gas. Autozone code was p1456. Car seems to be running fine.


2004 Honda Pilot engine light came on this morning. Last bought gas 5 days ago. Auto Zone checked and found code P1456, emission control system leak detected (fuel tank system)
Four options;
1) Loose fuel cap
2) Vapor canister saturated
3) Failed vent solanoid
4) Failed purge solenoid

Thanks.

Aug 14, 2010 | Honda Pilot Cars & Trucks

1 Answer

Check engine light came on, ran codes and got miss fire on #6 hole. changed plugs and cleared code, light came on again. ran codes and came up with P0440 evap. checked lines and found no defect. cleared...


Would guess that canister would be dealer only but never hurts to check the local parts store.Could also check online parts store.They say this problem comes from topping of your tank.When fueling and the pump shuts off you are not to put any more in.Just a thought.

Feb 02, 2010 | Buick Regal Cars & Trucks

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