I left my gas cap off the other day when I filled up and then drove to work the next morning. After work, the darned lights came on. I had these same lights once before about 30k miles ago and the dealership couldn't find any problem and said it was likely that I hadn't tightened the gas cap and they reset the code/lights. I recall being able to reset codes by pulling the EFI fuse in my 3rd gen. Anyone know how to clear the code/lights on the 4th?

It takes a certain time and it will go off on its own. Give it a couple days.

Had the same issue a week after I bought it, scare the ****t out of me. Took it to the dealer and they clear it plus some pressure loss on m tires.

disconnect the battery for a few mins to clear the codes. if they come back on, then get them scanned at Autozone or something.

+1

Just had to do this after getting a new gas cap.

I waited about 4 days and the code wasn't clearing. I didn't wanna disconnect it because I had my stereo head unit (aftermarket) adjusted just how I wanted it, but duh, no biggie, I just wrote down the settings and reprogrammed.

It's been about a week and no codes. *knocks on wood*

Yeah, I figured it would clear on its own eventually but there HAS to be some way for the owner to clear it manually. At least I know now that pulling the EFI fuse on the 4th gen doesn't work...

Can anyone confirm if this is the same as what happens when shops use OBD scanners and reset the "0" point setting for VSC?

Here is what you need

http://www.toyota-4runner.org/proble...libration.html

The zero point calibration could be a possibility if an aftermarket obd2 scanner was used. I had all three lights come on before too. But mine was cause my O2 sensor was bad. But i had to do a zero point calibration due to my use of the scanner and the fact that only the check engine light turned off after the change. But if its jist the gass cap just give it a little time with driving and start ups. Should go off on its own.

That's what I'm banking on at this point.

Well if not. Let me know i cam walk you through a zero loint calibration as well. Easy to do and dont cost more than a few dollars

I can tell you from personal experience just this week! I live in NY and had to take my car in for inspection. It didn't pass because I had used an OBDII scanner to reset the codes.

After that happens, you have to run the car through a series of drive cycles and check with the scanner again to see if they're good. This is the case whenever you reset anything using an OBDII on a Toyota.

After about 50 miles or so, everything checked out and went back for the inspection.

My case was the same, three EVAP codes all because of a faulty gas cap. I confirmed that the cap was faulty because it didn't have any spring tension when taking it off. It should have a little kickback to it and it didn't. I ordered another one on ebay for $15 and good as new.

a zero point calibration has nothing to do with resetting evap CEL codes thrown by a loose gas cap. this link does not belong in this thread. a zero point calibration is used to tell your skid control computer that the yaw sensors are at 0.

Nuke, just pull the negative terminal on the battery for a few seconds. It'll clear the codes and won't even throw off your head unit's presets. I had to do it several times while I was troubleshooting my gas cap issue.

Undo battery, doesn't cost anything.

After approximately 150 miles in about 3 days time, the lights have reset as I had hoped. Thanks for all the input.