usdmpwr07

I recently had a check engine come on that I believe was related to the gas cap not being on tight enough. It was P0442: Evaporative Emission Control System Leak Detected (small leak)

I tightened the gas cap a lot better and started it a few times but it's still there. Do I need to buy a scan tool and if so what's the best one to clear codes moderately priced? If there's a free way that would be great too. Any help is appreciated.

jim2092

Most brand name parts stores can read and clear codes for free or loan reader. (which can also clear)

Orion2011

You need to drive it a while before the light will go out. If that was the problem. I think it takes about 50 miles or so. Also Autozone can red/reset the code for free.

usdmpwr07

I had a co worker with an OBD2 reader get the code and clear. Thanks for your help.

tblu92

Yes takes 50 or so miles of normal driving for a code to go away after a fix---Also in order to have the "readiness monitors " to be set to ready---
A code reader only temporarily deletes a code unless the issue is repaired--However a TUNER can delete the code permanently whether the issue is repaired or not--
A mail order tune costs usually like $150 cheaper than a scanner and you'll never get that code ever again--

jim2092

Some confusing, some incorrect and some overkill.

phils C5 vette

You may be able to clear the code, but it will return if not fixed. Yes you can also turn it off in the computer

DinkyDonut

If you have an Android based smartphone (and, yes, I believe there is a similar setup for iPhones, but I've never used one.):

Get this:
And this: https://play.google.com/store/apps/d...l.torque&hl=en

I've been using that combo for years now on all of our cars. Always works. Always easy. Reads and clears codes, reads readiness monitors for inspection, you can build custom dashboards, and so on.

You can prevent some codes from being tripped by suppressing them in the tune. When you clear it with a reader, you also reset the readiness monitors. Unless you have fixed the code, it might very well come back once the monitor responsible for it turns ready again, which happens after a certain number of conditions have been met (these conditions vary, but you can find more by googling 'OBD2 drive cycle' for your car). Also, it may not come on as soon as the appropriate monitor sets ready, but instead after X number of faulty situations have been encountered. Alternatively, depending on the code, it might turn off by itself if X number of correct situations have been encountered.

Long story short: fixing the code instead of continuously resetting it usually provides better results. Your results may vary.

schpenxel

iPhone? Wifi elm327 + dash command. Great setup for under $50 total.