{"product_id":"topdon-obd2-scanner-al400-handheld-scan-tool-2-4-inch-color-screen-reads-clears-check-engine-codes","title":"TOPDON OBD2 Scanner AL400 handheld scan tool — 2.4-inch colour screen, reads \u0026 clears check-engine codes","description":"\u003cp\u003e\u003cstrong\u003eThe TOPDON AL400 is a handheld OBD2 scan tool that reads and clears check-engine codes, displays live engine data, and helps diagnose emission-related issues for most 1996-and-newer vehicles.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your dashboard shows a warning light or you want to verify emissions readiness before an inspection, the AL400 provides a straightforward way to identify problems without paying for a shop visit. Built for hobbyists and weekend mechanics, it supports common OBDII protocols and presents diagnostic results using an easy menu, a bright 2.4-inch color screen, and LED status indicators.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the AL400 identify the cause of a check-engine light?\u003c\/h3\u003e\n\u003cp\u003eThe AL400 reads standardized trouble codes (DTCs) from the vehicle computer, shows code definitions from its built-in library, and lets you clear codes after repairs. It also captures freeze-frame data so you can see the conditions present when the fault occurred.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReads and erases generic and some manufacturer OBD2 codes\u003c\/li\u003e\n  \u003cli\u003eBuilt-in DTC library for quick code descriptions\u003c\/li\u003e\n  \u003cli\u003eFreeze-frame capture to view engine conditions at fault time\u003c\/li\u003e\n  \u003cli\u003eLED color indicators: green (no fault), yellow (pending), red (confirmed)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat live-data and testing functions does it provide?\u003c\/h3\u003e\n\u003cp\u003eThe scanner offers live streaming of engine parameters, graphical views for easier trend spotting, and a set of 10 OBDII functions tailored to emissions testing. These tools let you monitor sensors and readiness monitors that are important for performance and smog inspections.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReal-time data streaming with graph and text display\u003c\/li\u003e\n  \u003cli\u003eI\/M readiness and monitor status for emissions checks\u003c\/li\u003e\n  \u003cli\u003eO2 sensor, catalyst, EVAP, and misfire monitoring tests\u003c\/li\u003e\n  \u003cli\u003eFreeze-frame and PID viewing to inspect suspect components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles are compatible with the AL400?\u003c\/h3\u003e\n\u003cp\u003eThe AL400 supports most passenger cars, light trucks, and SUVs built for North American markets from 1996 onward that follow standard OBDII protocols. It covers a range of communication standards so it will work on many makes and models.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSupports KWP2000, ISO9141, J1850 VPW, J1850 PWM and CAN protocols\u003c\/li\u003e\n  \u003cli\u003eDesigned for 1996 and newer OBD2-compliant vehicles\u003c\/li\u003e\n  \u003cli\u003eIdeal for petrol and light-duty vehicle applications\u003c\/li\u003e\n  \u003cli\u003eWorks across many domestic and imported brands\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is it to use and maintain the device?\u003c\/h3\u003e\n\u003cp\u003eThe AL400 is built with a simple interface, well-spaced buttons and a bright 2.4\" display, so you can operate it in low-light or outdoors. TOPDON provides free lifetime software updates and multilingual menus to keep the tool current and accessible.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e2.4-inch color screen for clear, in-garage viewing\u003c\/li\u003e\n  \u003cli\u003eMenus and DTC definitions in seven languages (EN\/FR\/DE\/ES\/PT\/JA\/IT)\u003c\/li\u003e\n  \u003cli\u003eFree lifetime updates to keep protocols and code lists current\u003c\/li\u003e\n  \u003cli\u003e12-month extended quality warranty and customer support access\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The TOPDON AL400 is best suited to car owners, DIY mechanics, and small shop technicians who need an affordable, no-frills OBD2 scanner for emissions troubleshooting, basic diagnostics, and pre-inspection checks. If you want quick fault identification, live sensor data, and straightforward operation without the complexity or cost of advanced diagnostic tools, this unit covers the essentials reliably.\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 AL400 work on my 2003 car?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it supports most 1996-and-newer vehicles that follow standard OBDII protocols such as CAN, ISO9141, and J1850.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need a computer for updates?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — TOPDON provides free lifetime updates; follow included instructions to update via the provided method without advanced setup.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"TOPDON","offers":[{"title":"Default Title","offer_id":55167212847447,"sku":"B09NW325DV","price":46.25,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/topdon-al400-front-display.jpg?v=1790378607","url":"https:\/\/britishgarage.co.uk\/products\/topdon-obd2-scanner-al400-handheld-scan-tool-2-4-inch-color-screen-reads-clears-check-engine-codes","provider":"British Garage","version":"1.0","type":"link"}