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Autel OBD2 Scanner MS309 Universal Car Engine Fault Code Reader, Check Engine Light and Emission Monitor Status, OBDII CAN Diagnostic Scan Tool

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About this item

  • 🔥【On-Screen DTC Definition, Save Time & Easy To Use】Autel MS309 OBD2 code reader with UPGRADED CHIP to retrive and clear generic(P0, P2, P3 and U0), manufacturer-specific(P1, P3 and U1) and pending codes, and display DTCs(Diagnostic Trouble Codes) meanings under the codes based on the built-in database(more than 3000 codes). Don't need to spend much time to search meanings on the internet. This advanced plug-and-play MS309 scanner saves you time - a must-have obd2 scanner for each car owner.
  • 🔥【Retrieve Freeze Frame Data &Vehicle info】The more specific the information available, the clearer the problem. The OBD2 scanner MS309 can retrieve freeze frame data, including important engine parameters like RPM, fuel pressure, fuel trim, engine coolant temperature, etc. Also it can retrieve Vehicle Information such as VIN number, Calibration ID(s), Calibration Verification Nos. (CVNs), etc, which is useful to check whether the ECU matches when you are buying a used car.
  • 🔥【Read Codes & Clear Codes】Knowing the codes in advance will brace you for the repair cost estimate so that you won't be fooled and get overcharged by the repair shop.This Autel MaxiScan MS309 obd2 scanner scans OBD2-compliant vehicle Diagnostic Trouble Codes (DTCs) in seconds to pinpoint emission-related issues. The little guy can do many basic but necessary works: read/clear codes, view DTC definition, turn off check engine light, check I/M Readiness status, retrieve freeze frame data and vehicle info.
  • 🔥【Turn Off Check Engine Light】When your car detects an emission related problem, Check Engine Light will be turned on. Do you want to spend hundreds of dollars to turn off this light every time, maybe it's just a gas cap that's not tightened or needs to change bad parts like spark plugs and ignition coils? With Autel MS309 scan tool, you can read code to quickly find out why the check engine light is on and reset it.
  • 🔥【Ready For Annual Smog Check】If the OBD II Readiness Monitors on your car are not “Ready”, your car may fail the smog check. MS309 OBD2 scanner can retrieve I/M Readiness status to check the monitors like misfire monitor, fuel system monitor, comprehensive components monitor, catalyst monitor, O2 sensors, EVAP, etc, to help your car ready pass the annual smog check. That way you won't waste time and money on a failed smoke check.
  • 🔥【Works on 99% Vehicles】Autel MaxiScan MS309 compact pocket code reader supports all OBD2 protocols: KWP2000, ISO2000, ISO9141, J1850 VPW, J1850 PWM and CAN. This OBD2 code scanner is compatible with 99% OBDII-Compliant vehicles, passenger cars or light trucks. For OBD2 cars, usually, post 1996 for US market, post 2006 for EU market and post 2009 for Asian market.
  • 🔥【No-Worry Purchase】Automotive OBDII scan tool MS309 comes with a 12-month warranty and free lifetime technical support. If you need any technical support, please feel free to contact us at 📞autelofficial @ outlook . com📞. NOTE: It does not support the full engine system, if need, pls consider ML629/ MK808BT, etc.



Product Description

Brand Story

Autel is one of the famous manufacturers of professional automotive diagnostic tools, equipment and accessories in the automotive aftermarket since 2004. Autel, with top automotive experts of years of experiences in the industry, has been committed to creating maximum value to customer worldwide by providing quality-assured, user-friendly, cost-effective and innovative products.

2024 Autel MS309 OBD2 Scanner Engine Fault Code Reader Retrieves Generic (P0, P2, P3 and U0), Manufacturer-specific (P1, P3 and U1), and Pending Codes

Autel MS309

2024 Plug & Play Autel MS309 OBD2 Scanner Engine Fault Code Reader, Read Vehicles VIN, Freeze Frame Data, DTCs Definitions, Battery-Free

Quickly scan and define vehicle Diagnostic Trouble Codes (DTCs) with this Plug-and-Play "handy little tool", compact code reader with the ability to view Vehicle VIN, Freeze Frame Data, check I/M Readiness (Emissions) and monitor status before go to anual SMOG CHECK. The MS309 is a go-to tool for quick vehicle health status. No battery is needed, powered by OBD2 cable pluged in vehicle OBD2 socket.

Functions

Autel MS309

View Freeze Frame Data

Autel MaxiScan MS309 is a basic and universal OBD2 code reader with View Freeze Frame function.

1. To view freeze frame, use SCROLL button to select View Freeze Frame from Diagnostic Menu and press ENTER/EXIT button.

2. Wait a few seconds while the code reader validates the PID MAP.

3. If the retrieved information covers more than one screen, use SCROLL button, as necessary, until all data have been shown up.

4. The number “x/x” to the upper right corner of the screen indicates total number of screens the retrieved freeze frame covers and sequence of currently displayed data.

5. If there is no freeze frame data available, an advisory message “No Freeze Frame Data Stored!” shows on the display.

Autel MS309

Retrieve I/M Readiness Status

I/M Readiness function is used to check the operations of the Emission System on OBD2 compliant vehicles. It is an excellent function to use prior to having a vehicle inspected for compliance to a state emissions program. Some latest vehicle models may support two types of I/M Readiness tests:

A. Since DTCs Cleared – indicates status of the monitors since the DTCs are erased.

B. This Drive Cycle – indicates status of monitors since the beginning of the current drive cycle.

An I/M Readiness Status result of “NO” does not necessarily indicate that the vehicle being tested will fail the state I/M inspection. For some states, one or more such monitors may be allowed to be “Not Ready” to pass the emissions inspection.

Autel ms309

DTC Definitions Display Below The DTCs Detected

Autel MS309 supprots DTC definitions. The definitons will be displayed under the codes. It provides you an easier way to read and a quick understanding of what's the meaning of the fault codes that was detected.No need to search online for what's the codes meaning.

Functions

Autel obd2 scanner

Retrieve Vehicle Info

Autel MS309 supprots DTC definitions. The definitons will be displayed under the codes. It provides you an easier way to read and a quick understanding of what's the meaning of the fault codes that was detected.No need to search online for what's the codes meaning.

Autel MS309 is a good tool to be with you to retrive vehicle VIN - This functions is very helpful if you go to market to buy an "used" vehicle. Since you can know the real year of the car based on the VIN retrivewed and won't be overcharged.

Autel MS309

Retrive Codes & Turn Off Check Engine Light

Autel MS309 universal OBD2 scanner not only read and clear generic codes(P0, P2, P3 and U0), but also support manufacturer-specific (P1, P3 and U1), and pending codes.

This function is performed with key on engine off (KOEO). Do not start the engine.

CAUTION: Erasing the Diagnostic Trouble Codes may allow the code reader to delete not only the codes from the vehicle’s on-board computer, but also “Freeze Frame” data and manufacturer enhanced data. Further, the I/M Readiness Monitor Status for all vehicle monitors is reset to Not Ready or Not Complete status. Do not erase the codes before the system has been checked completely by a technician.

autel ms309 obd2 scanner

Vehicle Coverage:

Vehicle OBD support in various regions (for reference)

European Region: OBD is only supported after 2006;

Americas: OBD is only supported after 1996;

Asia: OBD is only supported after 2009.


Andy Bauleni
2025-08-19 13:33:46
I bought this at a cheap price and used it on my car. Works with most of the cars including Japanese cars. Easy to use and provides correct readings.
Stone
2025-07-13 11:22:12
These are handy tools which are easy to use. It has worked on every car I have tried in on. It has been a very simple plug and play with easy-to-follow instructions. It has also pulled the trouble codes with np issues and a quick internet search will give you a fuller explanation of the repair needed.
T-Raw
2025-07-07 10:10:07
I keep these cheap readers in each vehicle in the event I get a check engine light away from home. Reliable and easy to use. Reads and erases codes which is all I need on the road to point me in the right direction on any error codes.
kevin harris
2025-06-27 13:52:11
I bought this [with my own money not a free on for a review] hoping I would not have to use my very expensive hand held ones anymore which are cumbersome and you always pretty much have to go to the computer to get the codes and search on the net to see what they mean, possible causes and possible fixes.I bought one on amazon similar to this one that was around $18 and had to buy a couple of apps for my phone [around 10 dollars for the apps] to be able to use it. It was OK but I wanted MORE information. I read amazon reviews and realized this was the Cadillac of them at this time [Jan 2016]. I got it in 2 days with Prime. I plugged it on my 3 vehicles and it gives us a plethora of information. We have since sold our hand held ones on craigslist since this thing works so good and gives you unbelievable amount of information. [I do have a couple of complaints, later in the review.]I have been looking for another used vehicle and this device has saved us thousands $$. Your phone is connected to the internet so it goes out and gets you a lot of extra info right away & also updates the device software if need be. It even gives you information about when was the last time someone ERASED ERROR CODES which is happening across the dealers & private sellers in the 40207 and 33186 zip codes more than you would have thought! [in DAYS:HRS:MINS and also miles]. Don't forget anyone can get a cheap code reader for less than 20 dollars and erase all codes!The serious codes that the vehicle computer reads will come back immediately if erased, others will take a day or 2 -or longer-of driving time to come back in. To late if you bought a vehicle from a private owner and it's in your name already. Its funny to see the face of people when I tell them, these are all the error codes that the vehicle is giving me, the possible causes [yes this thing does tell you that too!] and BTW someone erased the codes 3 days 22 hrs and 3 minutes ago! It will give you all recalls for the make and model has had from day one! You can ask the owner or dealer to make sure those have been addressed or not.Most will claim [dealers and private owners] that no one has erased the error codes. I say to them "well sir or madam, this is what YOUR vehicle computer is telling my device. It pretty much saying that someone came in here with a key and a code reader, plugged it in and erased the codes 3 days 22 hrs and 3 minutes ago!"When they finally fess up [not all of them do] I just ask them what were the codes that were erased [to see if it was something easy like they didn't close the fuel cap correctly or something serious like -which I got on several different vehicles without any lights on the dash-a catalytic converter, an O2 sensor or both, anti lock brake codes, steering angle sensors, low or high voltage power supply, tire pressure warning system codes, airbag malfunctions, etc].This purchase has saved thousands on repairs on several vehicles I checked and would have bought!. Sellers were asking top dollar for these vehicles because they had “no lights on the dash” and they had done a cleaning detail on the vehicle!I even took a vehicle that I really liked to a dealership and paid for an inspection. They didn't get what I got on the code reader at first [or just didn't plug their code reader] but when I complained to the service manager, they hooked up their reader and got the same stuff [erased codes] and other malfunction codes that were not showing on the dash. BTW this device only tells you that codes were erased, it does not tell ou which ones. They refunded my inspection money because of their embarrassment. That right there paid for this device!I also have run in a couple of situations where the person selling the vehicle has advertised a higher model of the vehicle I was looking at to get more money out of it. These are vehicles in the 7k to 15k range I've been looking at [clean title only]. This has happened with private sellers who either buy the LXE [as an example] letters from ebay or a junk yard [I am guessing] and put the new letters claiming the vehicle is a higher level that it really is. The software on this device reads the vin number goes to the net and gets the EXACT model and make from the vehicle. You should see the face of people when I tell them this is a L model [the lower end one ] and not the LEX one! Some of you would say this is on the tittle, well…. Not always. I have a Honda Odyssey and the title does NOT say which model it is!I think everyone reading this knows there are lots of people who are buying vehicles at auction, cleaning them up and sell them for profit posing as regular owners. A vehicle fax can be $40/vehicle and gets expensive quick if you do several cars. [I like vehicle carfax over other because they give you a lot more information on regular service etc than their competitors].In my area code and in the MIAMI area -which is were I have been also trying to buy a used vehicle- there are tons of people selling more than 10 vehicles a year [which are required by law to get a dealer license and do not]. When you ask them why is the vehicle not on their name, or why the have 4 vehicles for sale out of their house, or why was the title on the vehicles he/she's selling less than 3 weeks old the come with the story about them getting a better vehicle or sob storries. If you pry hard enough they'll tell you they are "wholesalers" but don't have the required licenses insurance etc and are less than reputable in the disclosure of their vehicles they're selling. Don't get me started on the habitual “private” sellers of salvage but repaired title vehicles!Use this device wisely and save yourself a lot of headaches or negotiate a better price on the used vehicle you are buying and also check your existing vehicles and telling your mechanic exactly what is going on. Be an informed consumer.I have two complaints about the device:1- When looking this couple of months for a used vehicle in zip code areas 40207 and 33186, I usually start the vehicle with it plugged in, let it read all the codes, vin number etc, while the vehicle is warming up, then I drive the vehicle for about 15 to 20 mins to get more info on what the vehicle is doing while you drive it etc and hope that one of the erased codes pops up again. I have lost connection with my phone and the device several times while driving, where I have to stop and reconnect it and therefore lost all data that was being recorded. I thought it could be my phone connection via the Blue-tooth, so I downloaded the app on my wifes phone and the same thing happens! They are both newer iphone 6 and 6 +. Sellers are not to happy to go around and drive the vehicle again for 20 mins so I can record results again!2-I have also had the device fall from the ODBII plug several times. This kind of sucks because you have to start the process all over again and lose all the data that was there before. I have checked about 20 vehicles in the last 3 months. I usually email myself the data while the app is running and they show the results from that email to the seller if there is something wrong since I haven't figured out how to save the data in the phone. I have resorted now to getting some blue tape and taping it around the plug and the device when its plugged in. Not something I'm happy about. Hope this helps some of you out there.
Tanya J Bollenbach
2025-06-14 16:24:21
Couldn't be any happier . Worth every penny !! Very easy to use ,I was able to erase my check engine light myself ,no more guessing !!
April
2025-06-06 18:36:15
Works great easy to use and read with accurate codes
Joshua Benware
2025-05-04 09:33:26
Update- it turns out my fuse was bad that powers this. It works great! Im sorry for the bad review!POS does not work. I know how to use a scanner, this one is defective though. It receives no power when plugged in. I looked up the troubleshooting on this model and the company says to remove the batteries and reinstall them. IT DOESNT EVEN TAKE BATTERIES. Geez, you just can't get much worse than this! Now I have to go out of my way to return this stupid cheap junk. I do not eecommend!
Thomas M.
2025-04-12 19:39:41
Most of the time it gives me an explanation with the code but when it doesn't you can always search it up! Good way to save money and find what the issue is in vehicles.
Santos Mejia
2025-03-15 21:29:22
Encanto
Alejandro Gomez
2025-02-17 15:09:11
Compré este pequeñín para revisar códigos de mis carros en casa. Es muy rápido, y aunque es muy básico, bien vale la pena; pues lo podemos transportar en la guantera, o con la herramienta. También resulta una gran ayuda si te gusta hacer mecánica en casa, o para dar seguimiento a fallas intermitentes o recurrentes.Todo muy bien. Sin embargo, no pude encontrar la marca Autel por ningún lado ni en el producto, ni el empaque.
JOSE ANTONIO VAZQUEZ SANCHEZ
2025-01-17 13:03:06
Excelente para detectar y borrar fallas en todo tipo de vehículos. Funcionó perfectamente en un Mercedes Benz
Mario ivan
2025-01-12 19:19:42
Buen producto sirvió para escanear un Nissan Versa
Ryan W.
2025-01-11 12:59:57
If you have a more complicated car, I'd highly recommend getting something else. Picked this up because I needed something cheap and functional but replaced it within a few months because it just didn't have the functionality I needed.
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