---
product_id: 82741033
title: "OBD2 Scanner MS309 Automotive Check Engine Code Reader, Check Emission Monitor Status, CAN Diagnostic Scan Tool for All OBDII Protocol Vehicles After 1996"
brand: "autel"
price: "$1138"
currency: MXN
in_stock: true
reviews_count: 10
category: "Autel"
url: https://www.desertcart.mx/products/82741033-obd2-scanner-ms309-automotive-check-engine-code-reader-check-emission
store_origin: MX
region: Mexico
---

# Displays DTC & I/M readiness codes Plug-and-play OBD-II connector Erases codes & turns off Check Engine Light OBD2 Scanner MS309 Automotive Check Engine Code Reader, Check Emission Monitor Status, CAN Diagnostic Scan Tool for All OBDII Protocol Vehicles After 1996

**Brand:** autel
**Price:** $1138
**Availability:** ✅ In Stock

## Summary

> 🚗 Decode, Diagnose, Dominate your Drive!

## Quick Answers

- **What is this?** OBD2 Scanner MS309 Automotive Check Engine Code Reader, Check Emission Monitor Status, CAN Diagnostic Scan Tool for All OBDII Protocol Vehicles After 1996 by autel
- **How much does it cost?** $1138 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/82741033-obd2-scanner-ms309-automotive-check-engine-code-reader-check-emission)

## Best For

- autel enthusiasts

## Why This Product

- Trusted autel brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Plug & Play:** No registration or batteries needed — just connect and diagnose in seconds
- • **Emission Ready, Always:** Monitors I/M readiness status to help you ace emissions tests with confidence
- • **User-Friendly Interface:** Backlit display with simple scroll and enter buttons for quick navigation, even in low light
- • **Reliable Support & Warranty:** 12-month warranty plus lifetime free tech support keeps you covered for years
- • **Instant Vehicle Health Check:** Reads generic & manufacturer-specific trouble codes for all OBDII vehicles post-1996

## Overview

The Autel MS309 is a compact, plug-and-play OBD2 scanner compatible with all standard OBDII vehicles from 1996 onward. It reads and clears engine trouble codes, displays detailed DTC definitions, and monitors emission readiness status to help you troubleshoot check engine lights and prepare for inspections. Designed for ease of use with a backlit screen and simple controls, it offers reliable diagnostics without the need for batteries or registration. Backed by a 12-month warranty and lifetime tech support, it’s the essential tool for proactive vehicle maintenance.

## Description

Buy Autel OBD2 Scanner MS309 Automotive Check Engine Code Reader, Check Emission Monitor Status, CAN Diagnostic Scan Tool for All OBDII Protocol Vehicles After 1996: Code Readers & Scan Tools - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: A Good Tool - Breif Overview Of It's Proper Use Included Here - This tool (and other tools like it) do NOT teach you to repair automobiles! Further, they do NOT allow you to pass most state inspection just be resetting codes. This tool will show you the current generic and manufacturer specific codes that have been triggered, as well as pending codes. It WILL reset the codes, INCLUDING the monitor codes, however, you can't make the car pass inspection by just resetting the codes. All of the, I/M Readiness," monitors MUST re-test and show, "Ready" before you can inspect the vehicle. This scanner WILL show I/M Readiness status, however, so you KNOW that he vehicle has re-run all of the required monitor tests AND PASSED them before you waste time trying to get your vehicle inspected only to fail the inspection. It is back-lit and the back light works well. It is built very well and should give YEARS of trouble free service is not overly abused. (Hey, we all drop stuff form time to time, and this little guy can take it) It is very easy to use and to navigate the menus. More often than not, when someone is considering purchasing this type of, "Stored Code," scanner, they are purchasing it because they have a, "Check Engine," light, (or MIL - Malfunction Indicator Light -same thing, just different terms for it), that they'd like to resolve, and often are addressing this before their vehicle inspection runs out. Though just resetting the codes will NOT help you pass inspection, it WILL help you to determine if repairs made are going to ALLOW you to pass inspection more quickly. Here's how: You read the codes, and PROPERLY DIAGNOSE the cause. After making what you believe to be the corrections needed to resolve the issue that caused the code(s), you use this to reset the ECU. Now, search the internet for your year, make and model vehicle and the term, "Drive cycle." For example, 2005 Subaru Forrester drive cycle." What you are looking for in the search results is instruction for driving the vehicle in such a way as to provide all of the operating conditions needed for all of your vehicle's I/M readiness monitor checks to complete their testing and report the status in the shortest time possible. Every manufacturer creates these, "Drive Cycle," routines so that the factory automotive technicians in the dealerships can make repairs and assure the vehicle's compliance with local emissions laws as quickly as possible. An example of a possible drive cycle (that I'm just making us as an example), might look like: "Allow vehicle to completely cool overnight. (All that really matters here is that the engine be stone-cold before beginning the drive cycle on that particular year make and model. Not all vehicles require this first step, or any other step I make up here. This is just and example) 1.) Start vehicle. 2.) Accelerate slowly to 30 MPH, and maintain speed for 45 seconds. 3.) accelerate slowly to 55 MPH and maintain speed for 30 seconds. 3.) slow to 40 MPH without using the brake or downshifting, and maintain speed for 45 seconds. 4.) Accelerate to 55 mph and maintain speed for 4 minutes. 5.) From 55 mph, come to a complete stop, and place the shift leaver into the "Park" position with your foot off he brake and off the accelerator within 30 seconds. 6.) Allow the engine to idle for 1 minute . . . " Etc. Some drive cycles are fairly involved, and some are very short and simple. None the less, if you can complete the drive cycle without the check engine light coming back on, that's a good sign. Now, follow the instructions that come with Autel MaxiScan309 to connect the unit. You'll have to shut the engine off. (In the industry we call this, "engine off - key out," as this eliminates any confusion about what position the key is in. If the key comes out, you're good) Put he key back in once connected, turn to the RUN position, and check the "I/M Readiness" codes. If all I/M Readiness indicators are reporting either, "OK," "Pass," or, "N/A" your car will now pass that portion of the state inspection. If any say they are incomplete, (I think this scanner says, "INC" for those if memory serves), you need to do the drive cycle again to get them to report. Some of the monitors will say, "N/A." That is FINE. Manufacturers have choices in how to approach emissions compliance on different models, and often several of the monitors do not need to be used, just so long as the ones the manufacturer DID choose to employ do enough testing to ensure compliance with Federal Regulations. One last tip, and this is a real important one. If you don't have the background to decipher diagnostic codes and interpret the likely causes of them, DON'T FRET! Let's say your 2010 Ford Whatchamacallit is throwing a P0442 code, as reported by the scanner. Just search the internet for, "2010 Ford Whatchamacallit P0442 code causes," and you will begin to find all of the information needed to further diagnose the fault, AND are also likely to read the most PROBABLE causes in many cases. Consider the information you find carefully, as there is not test information needs to pas in order to be posted on the internet! lol When you have done enough research about the code's appearance on YOUR specific vehicle, you will easily see trends that point to the most LIKELY causes too. From there, you can start researching how to accurately TEST each suspected part to find out if it really IS the cause or not. Before too long, you should be able to find the REAL cause, and PROVE the part defective for yourself so you are not performing unneeded repairs hoping a, "shot in the dark," will fix whatever is wrong. If you find this review and the other information helpful in full or in part, please click the "YES" box where it asks if it was helpful or not.
Review: useful tool - it works on my 2013 BMW, and easy to use

## Features

- ⚠️【Important Tips Before Purchase】1️⃣ Compatible with standard OBD II vehicles manufactured from 1996 onward in the US market. 2️⃣ Due to the Secure Gateway (SGW) / FCA AutoAuth security system, this tool is unable to access OBDII modules or clear codes for FCA vehicles (including Chrysler, Dodge, Jeep, etc.) produced after 2017. ⚠️3️⃣Vehicles equipped with an SGW module are also not supported. 4️⃣Functions are not universal. Please send a mes-sage via Am-azon or cont-act us at 📞 auteldirect @ outlook . com 📞 to confirm compatibility before ordering.
- 🧡【How to Get the PDF User Manual】A) Download it directly from the "Product guides and documents" section on the Am-azon product page. B) Mes-sage us via Am-azon or em-ail 📞 auteldirect @ outlook . com 📞, and we’ll send you the PDF version within 24 hours. ⚠️📢 Please Note: This product does not support full engine system diagnostics or advanced parameter display. If you require these functions, please consider upgrading to models such as the Autel MD906 Pro or MK808BT Pro. ⚠️❌The Autel MS309 is not listed on the US distributor’s website. It is exclusively available on the Autel HQ global site. If you need the w-eb, feel fr-ee to con-tact us.
- 🧡【How to Use?】The Autel MS309 is a plug-and-play device — no registration required. Steps: 1️⃣Insert the k- and turn to the ON position, but keep the engine OFF. 2️⃣Connect the MS309 to your vehicle’s OBD-II port using the provided cable. 3️⃣Select the desired function from the on-screen menu to begin. 📢 Please Note: The MS309 uses a standard OBD-II connector (16-pin). Please ensure your vehicle’s port is compatible and the connection is secure.
- 👍[TURN OFF CHECK ENGINE LIGHT] This car diagnostic tool supports Reading DTCs, displaying DTC definition under the codes, Freeze Frame & I/M Readiness etc to figure out the root cause of the Check Engine Light (CEL) and turning it off, to help you detect any potential problems, and to avoid excessive costs for unnecessary repairs.
- 👍[USER-FRIENDLY DESIGN] This check engine code reader features two easy-to-use buttons, namely: "Enter/ Exit" and "Scrool" buttons, which are very easy to operate. It comes with backlit display, and the cable is long enough without being too long and getting in the way. No batteries are needed.
- 👍[HIGH-QUALITY SERVICES] 12 months warranty from the date of purchase and lifetime free tech supports are offered by this Automobile OBDII scan tool. If need any tech support, please feel fr-ee to con-tact us via 🚘auteldirect @ outlook . com🚘.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001LHQBMC |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #313,081 in Automotive ( See Top 100 in Automotive ) #1,306 in Code Readers & Scan Tools |
| Brand | Autel |
| Customer Reviews | 4.5 4.5 out of 5 stars (3,626) |
| Date First Available | June 29, 2017 |
| Exterior | Plastic |
| Global Trade Identification Number | 00193195983507, 06937357200088 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 8.8 ounces |
| Item model number | MS309 |
| Manufacturer | Autel |
| Manufacturer Part Number | MS309 |
| Model | Autel |
| OEM Part Number | Supports CAN (Controller Area Network) and all other current OBD II protocols |
| Operating System | Linux |
| Product Dimensions | 2.74"L x 0.8"W x 4.34"H |
| Special Features | Compatible with domestic, Asian and European vehicles, 1996 and newer, Displays DTC definitions on screen, Displays monitor and I/M readiness status (emissions), Erases Codes and turns off Check Engine Lights, Retrieves generic (P0, P2, P3 and U0), manufacturer-specific (P1, P3 and U1), and pending codes, Retrieves vehicle identification information (VIN, CALID and CVN), Supports CAN (Controller A… |
| UPC | 508825559005 891638744721 713524943653 755263547778 608225589081 634425760166 193195983507 675234379934 702565320417 669954576292 647904097028 712407252318 707273312143 |
| Voltage | 12 Volts |
| Wattage | 2 watts |

## Product Details

- **Brand:** Autel
- **Operating System:** Linux
- **Power Source:** powered by car obd2 socket
- **Product Dimensions:** 2.74"L x 0.8"W x 4.34"H
- **Screen Size:** 1 Inches

## Images

![OBD2 Scanner MS309 Automotive Check Engine Code Reader, Check Emission Monitor Status, CAN Diagnostic Scan Tool for All OBDII Protocol Vehicles After 1996 - Image 1](https://m.media-amazon.com/images/I/71da4FHX+ZL.jpg)
![OBD2 Scanner MS309 Automotive Check Engine Code Reader, Check Emission Monitor Status, CAN Diagnostic Scan Tool for All OBDII Protocol Vehicles After 1996 - Image 2](https://m.media-amazon.com/images/I/81IQoSYbEcL.jpg)
![OBD2 Scanner MS309 Automotive Check Engine Code Reader, Check Emission Monitor Status, CAN Diagnostic Scan Tool for All OBDII Protocol Vehicles After 1996 - Image 3](https://m.media-amazon.com/images/I/91BV0LJMIiL.jpg)
![OBD2 Scanner MS309 Automotive Check Engine Code Reader, Check Emission Monitor Status, CAN Diagnostic Scan Tool for All OBDII Protocol Vehicles After 1996 - Image 4](https://m.media-amazon.com/images/I/815GW+5e12L.jpg)
![OBD2 Scanner MS309 Automotive Check Engine Code Reader, Check Emission Monitor Status, CAN Diagnostic Scan Tool for All OBDII Protocol Vehicles After 1996 - Image 5](https://m.media-amazon.com/images/I/81BLT9tf+JL.jpg)

## Questions & Answers

**Q: What kind of batteries does it use?**
A: It doesn't use batteries, it is powered by the OBD-II port when it is plugged in.

**Q: does it tell you the cide and whats wrong with it..or just gives you the code**
A: It give you the code and short narrative of the code.

**Q: will it work on nissan p11 if yes will it show rpm and such**
A: It will work on the P11.  The P11's OBD-II port is directly above the gas pedal.  It will not show RPM.

**Q: will this work with on 2002 Subaru Outback sedan?**
A: Yes it should work fine on any vehicle made past 1996 they are all equipped with obd2.

## Customer Reviews

### ⭐⭐⭐⭐⭐ A Good Tool - Breif Overview Of It's Proper Use Included Here
*by B***T on June 5, 2015*

This tool (and other tools like it) do NOT teach you to repair automobiles! Further, they do NOT allow you to pass most state inspection just be resetting codes. This tool will show you the current generic and manufacturer specific codes that have been triggered, as well as pending codes. It WILL reset the codes, INCLUDING the monitor codes, however, you can't make the car pass inspection by just resetting the codes. All of the, I/M Readiness," monitors MUST re-test and show, "Ready" before you can inspect the vehicle. This scanner WILL show I/M Readiness status, however, so you KNOW that he vehicle has re-run all of the required monitor tests AND PASSED them before you waste time trying to get your vehicle inspected only to fail the inspection. It is back-lit and the back light works well. It is built very well and should give YEARS of trouble free service is not overly abused. (Hey, we all drop stuff form time to time, and this little guy can take it) It is very easy to use and to navigate the menus. More often than not, when someone is considering purchasing this type of, "Stored Code," scanner, they are purchasing it because they have a, "Check Engine," light, (or MIL - Malfunction Indicator Light -same thing, just different terms for it), that they'd like to resolve, and often are addressing this before their vehicle inspection runs out. Though just resetting the codes will NOT help you pass inspection, it WILL help you to determine if repairs made are going to ALLOW you to pass inspection more quickly. Here's how: You read the codes, and PROPERLY DIAGNOSE the cause. After making what you believe to be the corrections needed to resolve the issue that caused the code(s), you use this to reset the ECU. Now, search the internet for your year, make and model vehicle and the term, "Drive cycle." For example, 2005 Subaru Forrester drive cycle." What you are looking for in the search results is instruction for driving the vehicle in such a way as to provide all of the operating conditions needed for all of your vehicle's I/M readiness monitor checks to complete their testing and report the status in the shortest time possible. Every manufacturer creates these, "Drive Cycle," routines so that the factory automotive technicians in the dealerships can make repairs and assure the vehicle's compliance with local emissions laws as quickly as possible. An example of a possible drive cycle (that I'm just making us as an example), might look like: "Allow vehicle to completely cool overnight. (All that really matters here is that the engine be stone-cold before beginning the drive cycle on that particular year make and model. Not all vehicles require this first step, or any other step I make up here. This is just and example) 1.) Start vehicle. 2.) Accelerate slowly to 30 MPH, and maintain speed for 45 seconds. 3.) accelerate slowly to 55 MPH and maintain speed for 30 seconds. 3.) slow to 40 MPH without using the brake or downshifting, and maintain speed for 45 seconds. 4.) Accelerate to 55 mph and maintain speed for 4 minutes. 5.) From 55 mph, come to a complete stop, and place the shift leaver into the "Park" position with your foot off he brake and off the accelerator within 30 seconds. 6.) Allow the engine to idle for 1 minute . . . " Etc. Some drive cycles are fairly involved, and some are very short and simple. None the less, if you can complete the drive cycle without the check engine light coming back on, that's a good sign. Now, follow the instructions that come with Autel MaxiScan309 to connect the unit. You'll have to shut the engine off. (In the industry we call this, "engine off - key out," as this eliminates any confusion about what position the key is in. If the key comes out, you're good) Put he key back in once connected, turn to the RUN position, and check the "I/M Readiness" codes. If all I/M Readiness indicators are reporting either, "OK," "Pass," or, "N/A" your car will now pass that portion of the state inspection. If any say they are incomplete, (I think this scanner says, "INC" for those if memory serves), you need to do the drive cycle again to get them to report. Some of the monitors will say, "N/A." That is FINE. Manufacturers have choices in how to approach emissions compliance on different models, and often several of the monitors do not need to be used, just so long as the ones the manufacturer DID choose to employ do enough testing to ensure compliance with Federal Regulations. One last tip, and this is a real important one. If you don't have the background to decipher diagnostic codes and interpret the likely causes of them, DON'T FRET! Let's say your 2010 Ford Whatchamacallit is throwing a P0442 code, as reported by the scanner. Just search the internet for, "2010 Ford Whatchamacallit P0442 code causes," and you will begin to find all of the information needed to further diagnose the fault, AND are also likely to read the most PROBABLE causes in many cases. Consider the information you find carefully, as there is not test information needs to pas in order to be posted on the internet! lol When you have done enough research about the code's appearance on YOUR specific vehicle, you will easily see trends that point to the most LIKELY causes too. From there, you can start researching how to accurately TEST each suspected part to find out if it really IS the cause or not. Before too long, you should be able to find the REAL cause, and PROVE the part defective for yourself so you are not performing unneeded repairs hoping a, "shot in the dark," will fix whatever is wrong. If you find this review and the other information helpful in full or in part, please click the "YES" box where it asks if it was helpful or not.

### ⭐⭐⭐⭐⭐ useful tool
*by O***R on February 3, 2026*

it works on my 2013 BMW, and easy to use

### ⭐⭐⭐⭐ It was easy to open hook up and operate
*by J***H on January 30, 2016*

I give this a 4 stars would give 5 except u do have to look up what codes are online but I already knew this b4 buying . It was easy to open hook up and operate. It took just about two minutes to scan and read code and cleared code and turned off check engine light . I purchased mine because I purchased a after market locking gas cap and has problems after a few months to get it to tighten good because they are designed to spin a little in order to lock. I knew when I saw my dash read check gas cap and I didn't have n e where to safely pull over so couldn't stop and tighten it and had to leave it loose for about 20 miles my check engine light came on. I pulled to auto zone had them double check and was as I thought there scanner read problem with gas cap . So I stopped in and purchased a oem gas cap as I drive a Pontiac with only 50,000 miles so was pretty certain I did not have a major problem , but places will not turn your check engine lights off for u n e more. So now I was easily able to do it myself with this scanner and I'm a blonde . So if I can use it n e body can! Plus my husband is a mechanic and appreciated having it at home for such a great price compared to auto parts store plus was shipped and delivered in 2 1/2 days.

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-02-22*