SKU: 7495029790

Autel MaxiScan MS309 Car Code Reader Check/ Clear Engine Fault Codes Universal OBD2 Diagnostic Scanner

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Description

Autel MaxiScan MS309 Car Code Reader Check/ Clear Engine Fault Codes Universal OBD2 Diagnostic ScannerAutel MaxiScan MS309 OBD2 Scanner Engine Fault Code Reader Quickly scan and define Vehicle Diagnostic Trouble Codes (DTCs) with this user friendly "handy little tool". It is a compact code reader that allows you to view Vehicle VIN, Freeze Frame Data, check I M Readiness (Emissions), and monitor status before going for an annual SMOG CHECK. The MS309 is the go to tool for quickly assessing vehicle health status. It does not require battery power as it

Autel MaxiScan MS309 OBD2 Scanner Engine Fault Code Reader

Quickly scan and define Vehicle Diagnostic Trouble Codes (DTCs) with this user-friendly "handy little tool". It is a compact code reader that allows you to view Vehicle VIN, Freeze Frame Data, check I/M Readiness (Emissions), and monitor status before going for an annual SMOG CHECK. The MS309 is the go-to tool for quickly assessing vehicle health status. It does not require battery power as it is powered by plugging the OBD2 cable into the vehicle's OBD2 socket.

Autel MaxiScan MS309 Main Features

  • 1. Read Codes
  • 2. Clear Codes
  • 3. Turn Off Check Engine Light
  • 4. View Freeze Frame Data
  • 5. Define Diagnostic Trouble Codes
  • 6. O2 Sensor Test
  • 7. Component Test
  • 8. View Vehicle Information
  • 9. On-Board Monitor Test
  • 10. I/M Readiness Status(Smog Check)
  • 11. OBD II Readiness Monitors
  • 12. OBD II Monitor Readiness Status

View Freeze Frame Data

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

  • 1. To view the freeze frame, use the SCROLL button to select "View Freeze Frame" from the Diagnostic Menu and press the 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 the SCROLL button as necessary until all data have been displayed.
  • 4. The number "x/x" in the upper right corner of the screen indicates the total number of screens the retrieved freeze frame covers and the sequence of currently displayed data.
  • 5. If no freeze frame data is available, an advisory message saying "No Freeze Frame Data Stored!" will be displayed.

Retrieve I/M Readiness Status

The 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 with state emissions programs. Some of the latest vehicle models may support two types of I/M Readiness tests.

  • Since DTCs Cleared: indicates status of the monitors since the DTCs are erased.
  • 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. In some states, it is permissible for one or more monitors to be "Not Ready" and still pass the emissions inspection.

Retrieve Vehicle Info

The Autel MS309 supports DTC definitions. The definitions will be displayed alongside the codes, providing you with an easier way to read and quickly understand the meaning of the detected fault codes. There is no need to search online for the meaning of the codes.

The Autel MS309 is a useful tool for retrieving a vehicle's VIN. This function proves to be very helpful when purchasing a used vehicle from the market. By retrieving the VIN, you can accurately determine the car's true year and avoid being overcharged.

DTC Definitions Display Below The DTCs Detected

The Autel MS309 supports DTC definitions. The definitions will be displayed under the codes, providing you with an easier way to read and quickly understand the meaning of the detected fault codes. There is no need to search online for the meaning of the codes.

Retrieve Codes & Turn Off Check Engine Light

The Autel MS309 universal OBD2 scanner not only reads and clears generic codes (P0, P2, P3, and U0), but also supports manufacturer-specific codes (P1, P3, and U1), as well as pending codes.

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

Caution: Erasing the Diagnostic Trouble Codes may result in the code reader deleting not only the codes from the vehicle's on-board computer but also the "Freeze Frame" data and manufacturer enhanced data. Additionally, the I/M Readiness Monitor Status for all vehicle monitors will be reset to a Not Ready or Not Complete status. Do not erase the codes until the system has been thoroughly checked by a technician.

Wide 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;
  • Americas: OBD is only supported after 1996;

Autel MaxiScan MS309 Specifications

Display Backlit, 128x64 pixel display
Operating Temp 0 to 60 ℃ (32 to 140 ℉)
Storage Temp -20 to 70 ℃ (-4 to 158 ℉)
Power 8 to 18 V provided via the vehicle battery
Dimensions (LxWxH) 110.3 mm (4.34") x 69.5 mm (2.74") x 20.2 mm (0.80")
Weight NW: 180 g (0.39 lb.); GW: 210 g (0.46 lb.)

Packing List:

  • 1x MaxiScan MS309 Main Unit
  • 1x 16 PIN Standard OBD II Cable

MS309 Product guides and documents

MS309 User Manual (PDF)

Certificate

www.diagmart.com is Autel Authorized Online Agent. Products Created by Autel ® Innovation & Quality You Can Trust.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 7495029790

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4.7 ★★★★★
Based on 10 reviews
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Product Reviews
A
Verified Purchase
Amazon Customer
Natrona Heights, US
★★★★★ 4
A bit expensive
Size: Queen (Pack of 1)
Waited to give a review on this one because I needed several nights before I had any idea if it was as good as everyone says. I've had a real problem finding pillows lately. Either they're too soft to provide support and I wake up with a stiff neck or they're too sturdy and I wake up with a stiff neck. Contour pillows have worked best for me, but they fall under the category of too sturdy. I also toss and turn too much at night, which means I always end up in an awkward position with contour pillows. So I took a chance on an obscenely expensive pillow, and yes, that is the reason for one less star. I'd happily pay $70 for a pillow I thought was amazing and comfortable and perfect, but this one wasn't quite it. It IS comfortable. I have slept on it for a month now without it making my neck stiff, so it does actually provide a good balance between soft and sturdy. They make it easy to stuff the pillow to your preferred fluffiness and even provide extra stuffing if you need it, which adds to the degree of comfort. While the pillow does provide good neck support, I toss and turn a bit trying to find a comfortable position when I first try to sleep. The stuffing within the pillow moves around at night, most notably shifting to the side and the pillow is notably flatter now than when I first purchased it. You can fluff it out, similarly to a down pillow, but it doesn't seem to retain its shape on its own. In some ways, that's good because what it does instead is try to retain a shape that fits you. So yes, this is a really good pillow. One of the better ones you can buy. But it's really expensive for a pillow.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
A
Verified Purchase
Amber Teele
Houston, US
★★★★★ 5
Best pillow I've ever had
Size: Queen (Pack of 1)
I don't really write reviews but holy buckets, Batman. This pillow is legit. Back, neck, and shoulder pain is nothing new for me; I've had scoliosis since I was a kid and hyperflexibility in my neck since birth leading to frequent muscle spasms that have caused me to miss work. Guys. This pillow. It is the most comfortable pillow I've ever had. Like, my neck doesn't hurt and I genuinely didn't remember what that felt like. It's simultaneously supportive and soft and it doesn't sink in. The instructions are super clear to understand and the pillow fluffs up no problem if it gets a little flat. This is a game changer for me and I so hope anyone who buys this has the same experience.
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Reviewed in the United States on June 6, 2026
D
Verified Purchase
Dana K.
Waukegan, US
★★★★★ 5
I highly recommend this pillow, it’s great for someone with neck or back problems.
Size: Queen (Pack of 1), Size: Queen (Pack of 1)
I absolutely love this pillow! When it says it’s adjustable it definitely means that. When you first get it, it’s hard to believe that it’s going to be anything but put it in the dryer for a few minutes and it becomes so large. You will definitely have to remove some of the stuffing unless you like a really large fluffy pillow. The stuffing is high-quality and once it has been put into the dryer it becomes a fibrous type material that can be fluffed over and over and go back to the same size. It seems to be a high-quality cover on the outer portion and is thick and has a slight cooling affect. It has a separate cover on the inner portion covering the foam stuffing. I ordered this because I have neck problems and it has been super comfortable for me because I’m able to adjust it multiple times depending on my needs for the particular night when I lay down. Having the extra stuffing means that if the pillow does happen to go flat I can always add the extra that I took out when I received it. It did have a slight odor when it first came, but after putting it in the dryer, it went away immediately. I do think that’s only due to the plastic that it’s shipped in not anything with the pillow. I think this pillow is well worth it price and I would highly recommend it for anyone that is a side or back sleeper or has any type of neck problems.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 3, 2026
C
Verified Purchase
Caitlyn
Bozeman, US
★★★★★ 5
Amazing!
Size: King (Pack of 1)
Such a great pillow I’m buying another one! You can add or subtract stuffing to your liking. It’s really nice quality, quilted and soft. Best pillow ever. Super comfy and great sleep. Pretty firm with all the stuffing. Perfect the way it came with stuffing on the side. My husband loves it and now I want one.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
A
Verified Purchase
Alli
Port Orchard, US
★★★★★ 5
Totally worth the money
Size: King (Pack of 1), Size: King (Pack of 1)
Right off the bat, the packaging is absolutely adorable and felt like I was buying a premium product. I love that this pillow is adjustable and as a side sleeper, I needed a pillow that is both firm and supportive of my neck. This hits all the boxes. We will be buying more of these for our bed!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 1, 2026

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