EnglishSubtitle: added by anonim
How To Clear A Check Engine Light With No Scan Tool
1 00:00:01,979 --> 00:00:05,770 All Flat Rate Mechanic here and I just want to do a quick video on how you 2 00:00:05,770 --> 00:00:09,519 can clear your check engine light without a scan tool 3 00:00:09,519 --> 00:00:12,610 I actually got scan tool hooked up right now just to show you guys what we have 4 00:00:12,610 --> 00:00:17,920 as far as codes and things but um I'm gonna tell you how to clear without a 5 00:00:17,920 --> 00:00:22,570 scan tool and also a number of reasons why and a lot of cases you shouldn't 6 00:00:22,570 --> 00:00:26,460 clear the check engine light so let's get right into this I got the scanner hooked up and first 7 00:00:26,460 --> 00:00:30,60 we're just looking at the monitors here to see if all the monitors are set which 8 00:00:30,60 --> 00:00:33,910 is basically a series of tests that your computer goes through to make sure all 9 00:00:33,910 --> 00:00:37,719 the systems are working right and it's all set we're gonna go down see we got 10 00:00:37,719 --> 00:00:43,719 four codes here we've got a p0456 for a very small evap leak and a 11 00:00:43,719 --> 00:00:49,570 p0442 for a small small leak so we're gonna go ahead and try and clear these 12 00:00:49,570 --> 00:01:01,829 without using the sand tool and all I'm gonna do is go onto the hood here and 13 00:01:01,829 --> 00:01:04,870 I've already loosened up these battery terminals and we're just gonna 14 00:01:04,870 --> 00:01:13,110 disconnect them for oh I'd say about a minute and also it's a good idea a lot 15 00:01:13,110 --> 00:01:18,759 of times these cables don't reach but you can sort them out short them out 16 00:01:18,759 --> 00:01:21,150 with a wrench or something with it like they do here and what that's gonna do is 17 00:01:21,150 --> 00:01:26,950 this actually gonna it's gonna drain the power that may be stored in the computer 18 00:01:26,950 --> 00:01:30,270 or anything like that so the short those out briefly leave this disconnected for 19 00:01:30,270 --> 00:01:36,820 about a minute which I'm gonna do and we'll be right back alright so we had 20 00:01:36,820 --> 00:01:40,20 the battery disconnected for a little over a minute we shorted out the wrench 21 00:01:40,20 --> 00:01:45,880 just to drain all the power that may be stored in any of the computers now just 22 00:01:45,880 --> 00:01:49,259 a word advice this does not work on all vehicles it works on most older 23 00:01:49,259 --> 00:01:53,430 model vehicles where this one is a little newer it may not even work so 24 00:01:53,430 --> 00:02:00,509 let's go in here start it up and see if the check engines light is gone 25 00:02:08,500 --> 00:02:15,710 all right so as you can see that did work now what we're gonna find on the 26 00:02:15,710 --> 00:02:18,270 scanner I'll show you guys 27 00:02:38,300 --> 00:02:41,210 I'll also leave a link below where you can get this little handheld scanner 28 00:02:41,210 --> 00:02:47,700 comes in real handy alright so by disconnecting the battery for a minute 29 00:02:47,700 --> 00:02:54,870 and we did get our check engine light clear but I'll show you what happens 30 00:02:54,870 --> 00:03:05,60 after we do that as soon as we get connected here alright so now you can 31 00:03:05,60 --> 00:03:09,200 see we're looking at these emissions monitors it says IM monitors DTC's 32 00:03:09,200 --> 00:03:13,250 cleared we're looking at these monitors and they're already in complete the i NC 33 00:03:13,250 --> 00:03:17,880 means incomplete mins means none of these tests have run now what happens 34 00:03:17,880 --> 00:03:20,940 when none of these tests have been run if you go in for admissions test or 35 00:03:20,940 --> 00:03:24,570 something like that even though your check engine light is off it's still 36 00:03:24,570 --> 00:03:29,880 going to fail the admission test until all these until all these monitors have 37 00:03:29,880 --> 00:03:34,10 passed and if they haven't passed that's when it's going to set code now also a 38 00:03:34,10 --> 00:03:39,510 lot of times when you're going to buy a vehicle if you're buying a used vehicle 39 00:03:39,510 --> 00:03:42,140 and they're you know the sellers a little sketchy they may have went in and 40 00:03:42,140 --> 00:03:45,290 cleared the check engine light and that light's not going to come back on until 41 00:03:45,290 --> 00:03:49,890 these tests are set so you may purchase a vehicle with no check engine light and 42 00:03:49,890 --> 00:03:52,950 then you drive down the road and the light pops on so if you are buying a 43 00:03:52,950 --> 00:03:54,350 new vehicle it's always a good idea to have one of these little handheld 44 00:03:54,350 --> 00:03:58,490 scanners and you can plug it in and you can look at the monitors and see if they 45 00:03:58,490 --> 00:04:02,520 have set if they have not set then that means they probably cleared the light 46 00:04:02,520 --> 00:04:06,500 and there's probably a problem in the emission system somewhere so always be 47 00:04:06,500 --> 00:04:11,970 aware of that also if you have a check engine light and you plan on bringing it 48 00:04:11,970 --> 00:04:14,420 to get repaired you definitely do not want to clear that light before you 49 00:04:14,420 --> 00:04:17,450 bring it to the repair shop because you bring it in and they're not gonna have 50 00:04:17,450 --> 00:04:21,470 any information to go by or a code I mean unless you write that code down 51 00:04:21,470 --> 00:04:25,280 prior to clearing it which is something you probably always want to do that's 52 00:04:25,280 --> 00:04:28,890 why one of these little handheld scanners comes in real handy because 53 00:04:28,890 --> 00:04:33,780 it's not a bad idea to clear the code and drive the vehicle just to make sure 54 00:04:33,780 --> 00:04:36,900 it wasn't it wasn't a fluke or something like in this case we have some evap 55 00:04:36,900 --> 00:04:41,970 codes so it's possible you know the customer may have just let the gas cap 56 00:04:41,970 --> 00:04:45,200 loose or something along those lines so in a case like this it would always be a 57 00:04:45,200 --> 00:04:49,310 good idea to clear the code and drive it and see if the check engine light comes back if it does 58 00:04:49,310 --> 00:04:52,620 come back then you're gonna want to leave that light on 59 00:04:52,620 --> 00:04:56,910 until you get a looked at that way the technician looking at it has information 60 00:04:56,910 --> 00:05:00,510 to go by because if you guys if it gets cleared then I really have nothing to go 61 00:05:00,510 --> 00:05:02,300 by and they won't be able to fix it but that about does it for this video guys 62 00:05:02,300 --> 00:05:04,310 if it was helpful be sure to hit the thumbs up button 63 00:05:04,310 --> 00:05:09,680 and subscribe to the flat rate mechanic thanks
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