{"product_id":"autel-obd2-code-reader-ms309-universal-obd-ii-engine-fault-scanner-plug-and-play-read-clear-dtcs","title":"Autel OBD2 Code Reader MS309 — Universal OBD-II Engine Fault Scanner, Plug-and-Play, Read\/Clear DTCs","description":"\u003cp\u003e\u003cstrong\u003eThe Autel MS309 is a plug-and-play OBD-II code reader that reads and clears engine fault codes, shows code definitions and freeze frame data to help identify why a Check Engine Light is on.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you own a 1996-or-newer car with a standard OBD-II port and you want a straightforward, budget-friendly tool to diagnose engine trouble codes, the Autel MS309 delivers core diagnostic functions without complex setup. It is designed for DIYers and drivers who prefer a simple handheld reader to pull DTCs (Diagnostic Trouble Codes), view code explanations, and check readiness monitors.\u003c\/p\u003e\n\n\u003ch3\u003eWhat basic functions does the MS309 perform?\u003c\/h3\u003e\n\u003cp\u003eThe MS309 focuses on essential engine diagnostics. It reads and clears stored and pending DTCs, displays built-in definitions for codes, captures freeze frame data, and shows I\/M readiness status so you can determine if emissions systems are ready for testing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReads\/erases engine fault codes (DTCs)\u003c\/li\u003e\n  \u003cli\u003eDisplays short descriptions for codes on screen\u003c\/li\u003e\n  \u003cli\u003eFreeze frame data capture to view sensor values at fault time\u003c\/li\u003e\n  \u003cli\u003eI\/M readiness status for emissions testing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles are compatible with the Autel MS309?\u003c\/h3\u003e\n\u003cp\u003eThe MS309 supports most vehicles built to the OBD-II standard (commonly 1996 and newer for US-market cars). However, some manufacturers use security gateways or proprietary systems that limit access—most notably some FCA (Chrysler, Dodge, Jeep) models from 2018 onward and vehicles with Secure Gateway modules.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with standard OBD-II (US market 1996+ vehicles)\u003c\/li\u003e\n  \u003cli\u003eDoes not access or clear codes on certain SGW-protected vehicles\u003c\/li\u003e\n  \u003cli\u003eNot suitable for full system, advanced parameter, or bi-directional tests\u003c\/li\u003e\n  \u003cli\u003eContact seller to confirm compatibility for specific makes\/models\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is the MS309 to use for non-professionals?\u003c\/h3\u003e\n\u003cp\u003eThe unit is designed for straightforward operation: plug it into the vehicle’s 16-pin OBD-II port, power the ignition to ON, and navigate simple on-screen menus with two buttons. No registration, batteries, or complex configuration are required, making it convenient for first-time users.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePlug-and-play connection via standard 16-pin OBD-II cable\u003c\/li\u003e\n  \u003cli\u003eTwo-button interface (Enter\/Exit and Scroll) with backlit display\u003c\/li\u003e\n  \u003cli\u003eNo batteries or app pairing needed—vehicle supplies power\u003c\/li\u003e\n  \u003cli\u003eQuick on-screen code definitions help with immediate troubleshooting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat support and limitations should buyers know?\u003c\/h3\u003e\n\u003cp\u003eAutel offers a 12-month warranty and lifetime technical support for the MS309, but the device does not provide advanced diagnostics such as full-system scans, live parameter graphing, or service resets. If you need those features, consider higher-tier Autel models.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e12-month warranty and free lifetime tech support available\u003c\/li\u003e\n  \u003cli\u003eNot intended for advanced ECU coding or full vehicle system diagnostics\u003c\/li\u003e\n  \u003cli\u003ePDF manual downloadable from the product documentation page or by contacting seller\u003c\/li\u003e\n  \u003cli\u003eCheck compatibility with seller before purchase for certain makes\/models\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The Autel MS309 is ideal for car owners and amateur mechanics who want a low-cost, reliable tool to read and clear engine fault codes, verify emissions readiness, and view basic freeze frame data. It’s best for routine troubleshooting and pre-repair checks on OBD-II compliant vehicles, but not for technicians who need advanced diagnostic or manufacturer-level functions.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will the MS309 work on my 2015 Honda Civic?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, if your Civic is OBD-II compliant the MS309 will read and clear engine codes and show readiness status.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can the MS309 access FCA models made after 2017?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. Vehicles with FCA Secure Gateway or similar protections are not supported for code access or clearing.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Autel","offers":[{"title":"Default Title","offer_id":48084362985630,"sku":"B001LHQBMC","price":34.31,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/autel-ms309-front-view.jpg?v=1785851776","url":"https:\/\/northtrailauto.ca\/products\/autel-obd2-code-reader-ms309-universal-obd-ii-engine-fault-scanner-plug-and-play-read-clear-dtcs","provider":"North Trail Auto","version":"1.0","type":"link"}