★★★★ 5693 real customer reviews average rating: 4.2 stars
1 Stars By Good Stuff on 2016-03-30
Warning from Autel for those of you taking the time to peruse the reviews
Warning - my Autel was not an Autel and didn't work properly. I contacted Autel tech support and they said the following:
From: Tina_auteltech [mailto:email@example.com]
Sent: Wednesday, March 30, 2016 6:22 PM
Subject: RE: Question on MS300 MaxiScan freezing on READ function
MS300, which is an old product, has already been discontinued for a long time, therefore we are not able to provide further update and support. If you purchased recently, I am afraid you purchased a fake one.
In order to ensure warranty and support, it is highly recommended to buy our products from our authorized dealers. If the product is bought recently, you can contact your dealer for return or exchange. For our newly released products, please go to [...]
Thanks & Best regards
5 Stars By Tripp on 2016-03-30
Tough little code reader
For $13.78 with free shipping this tool has already paid for itself. Iv'e diagnosed codes on 3 different vehicles. The first was a 98 Mazda B2500 which pulled 3 codes all specific to co2 sensor - lean fuel, which was the result of a leaking intake manifold gasket.. On the Mazda I did note that the reader just barely plugged into the obd2 connector but was not an issue on the other vehicles ...
The 2nd vehicle was a 02 Lexus LS430 which revealed I had a bad o2 sensor...Replaced sensor and cleared code, a week later no recurring check engine light.. problem fixed
The 3rd vehicle was a 02 Chevy 2500HD... as can be seen in pics below the reader will show 2 separate digits below the dtc, in my case I had 5 codes... the first number identifies the number code in order set and the 2nd number identifies how many codes have been set....
As can be seen in pic below the reader identified dtc P1683 which is a manufacture code for - PCM needs to be reflashed...Also code P0327 - faulty knock sensor bank 1 of faulty connector or harness...
When using on Honda and Toyota vehicles, it will appear as if the scanner does not communicate, be patient and wait a few minutes as the scanner will read these vehicles..
Easy to use....
1_ plug into obd2 connector
2_ then turn ignition on ( works just the same if you start vehicle )
3_ press scroll button and (1) - dtc will appear, press enter to read codes
4_ to clear. press enter and use scroll key until "erase" appears, you'll be asked yes or no... press enter ket for yes
Once codes are cleared, start vehicle to verify CEL is no longer illuminated... if you check for codes again on scanner , the codes will still show as pending, once you remove scanner from plug (power) and plug back in, the scanner will then read no codes
Best of all, I left the reader overnight on a bench outdoors and it rained, I dried the reader off and dried with compressed air and stored in a ziplock baggie with rice for several days. Plugged reader in obd2 port and it works like it did when I first received it.... Pics may be blurry as I took them on a iPhone at night with camera flash...
You can't go wrong with this purchase
2 Stars By RWB on 2016-09-12
Good Device for Quick Code Reading
I originally gave this device a 4 star rating and the original post below. I have now had the item for a year. I can now say that the linking error issues with this device are constant. There is only 1 vehicle (2006 Chevy Silverado) that the device doesn't give an error with. Every other vehicle (6) that I've tried this with it gives a linking error and will not connect. The Envoy that I mention in the original post now will not connect at all.
Do yourself a favor. Spend a little extra money and get a better device.
There's no need to spend your gas or time running by your favorite auto supply store anymore to have your vehicle scanned! For the price it is hard to beat this scan tool. It has a hard time connecting to my 2002 gmc envoy which is why I do not give it 5 stars. I have to disconnect it and reconnect it multiple times before it will connect. I have no problem getting it to connect to other cars. This scanner does not give potential problems; it tells you the code. It does come with a book to indicate what the code represents. You'll still need to go to a search engine to determine potential fixes. It will also reset your codes without the need to unhook your battery.
1 Stars By Cyclist on 2014-03-20
Changing my rating.Giving wrong codes.
It reads error codes, comes with a pamphlet of error code definitions and turns off the "Service Engine Light". This is particularly handy when you don't tighten up your gas cap properly and your engine light comes on when there is no problem with your engine. I would recommend this for anyone who has a car (or truck). Why pay a garage to tell you what's wrong with your car and turn off your engine light? I purchased the "OBD-II & Electronic Engine Management Systems" Haynes Techbook with this Scan Tool but you really don't need it. It may be helpful if you are doing some of your own repairs.
10/2/15 - I've had this for a couple of years now. I dropped my rating down to 1 star. The MS300 Scan tool is misreading the codes. I got a P0442 error code which is a EVAP leak, which can indicate a loose gas cap. It turned out that the pipe near my catalytic converter rusted through and triggered my oxygen sensor. NOT AN EVAP PROBLEM! On other cars that I hooked it up to, it has showed EVAP leak also. I wonder what the real problem was in those cars. I would not recommend this product.
4 Stars By Phil on 2017-04-12
Works great, able to read and diagnose issues and clear error codes
I purchased this years ago and it worked great for my 2007 Pontiac to read and diagnose the error codes. One time it caught a bad O2 sensor and I was able to replace the part and clear the code. Great little tool if you like to work on your own car and fix minor issues for a lot less than taking it into the shop! It could have come with a better manual though and the cd with the code database only contains generic error codes, so you'll probably end up searching online for answers anyway.
3 Stars By J. Kim on 2017-09-26
Works inconsistently and not with every OBDII car...
When it works, it's a handy little tool to read and clear codes. However it's not always worked. The most recent car it did not work on was a 2007 Toyota Corolla a few days ago. I wish I kept better track of what cars it did not work with, but this is probably the 3rd car out of 8 or so (I'm not a mechanic, just a "car guy") where I couldn't use this tool to check the CEL and had to switch to another. It wasn't bad for the price but I don't like relying on it. I didn't expect to it to be as good as my $120 reader but I was still disappointed. I want to say that the other car it didn't work for was maybe a 2009 Toyota Avalon, but don't hold me to it.
If you're thinking about buying one off of somebody to maybe keep in your own car, at least ask if you can verify that it will read your car before you commit to buying it, and don't expect it to work on somebody else's car even if it works on yours.
1 Stars By BTA-MALL Customer on 2017-12-19
I did some old school diagnosis and found the #3 coil went bad. Replaced coils which resolved the misfire and flashing ...
Bottom line: The Autel MaxiScan MS300 does not provide reliable diagnosis information. This scammer could not find a trouble code two out of three times when the check engine light was on.
Details: I'm an ASE certified tech turned accountant and currently only work on our own cars. We purchased the Autel MaxiScan MS300 to help diagnose an illuminated check engine light on our 2006 Hyundai Accent. I suspected a loose fuel cap because a few days after tightening the cap the check engine light went away. Received scanner, verified the stored code was for a major EVAP leak, and moved on with life.
Six months later my wife and I were leaving the house when the engine on our Accent began misfiring and the check engine light was flashing. I connected the scanner, figuring I would have this misfire figured out quickly. To my surprise, the scanner found no codes and indicated that the check engine light (MIL) was not on. I did some old school diagnosis and found the #3 coil went bad. Replaced coils which resolved the misfire and flashing check engine light.
Ten months after purchasing the scanner another check engine light reared its ugly head on our Accent. Tried the scanner again and found no codes. Equally concerning, the scanner told me the check engine light was off. I took the car to AutoZone and their scanner found code P0496.
Moral of the story is you get what you pay for. Expect little diagnostic help from this low priced scanner.
5 Stars By Justin Marchant on 2016-12-14
Handy tool to keep around particularly in older cars. Saves a trip to the dealer or local auto parts store if they are even willing to check codes for you now a days (most Autozones, Advance Auto's, and O'reilly's will not). Easy plug and play. If you don't know what the codes mean, easy to google and narrow down what could be wrong. Particularly useful to identify if it is something as simple as a evap leak code aka loose gas cap!
5 Stars By Beverly Medley McCall on 2016-07-02
Wonderful product, works well and saves time and trips to the parts store when the check engine light is on!
This is an excellent product and works great. Sure wish I had had one of these years ago when I had older SUV's and made the trip to the local auto store every time the check engine light came on. I now have a '15 Xterra ProX and thankfully, so far I have had no issues. However, my son has an '09 Jeep Grand Cherokee that he has tricked out for off road use and grandson has an '06 of the same. Of course with the way they run them and considering all the modifications, they get the check engine notification relatively often so when I was offered this product at a discount for an honest and unbiased review, I gratefully accepted. Though I have only had it for a couple of weeks, my son has already used it and immediately found out he needed a new o2 sensor. He is thrilled with the ease of use and the fact that he can diagnose issues quickly and easily without the guess work that he has been doing when the check engine light came on. Of course now that his friends know he has it, a couple of them have asked to borrow it which I have learned the hard way to just tell them they are welcome to use it here but no taking it with them!
5 Stars By Buck on 2016-05-24
Great product for the price.
Bought this unit to read codes on a 2000 Ford Ranger, worked great got the codes first try, cleared the codes out as well. Have used on a 1996 Chevy Berretta, and 1998 and 1996 Dodge neon's, 2003 Ford Expedition read all the codes and cleared as well. Just follow the simple directions, great time saving maintaining a fleet of kids cars. Codes were easy to find on the internet both the code description and the possible fixes. Also had all the codes in the repair manuals I have for the cars.