{"product_id":"front-lambda-oxygen-o2-sensor-03l906262p-for-a-udi-a1-a3-a4-a5-a6-a7-a8-q3-q5-q7","title":"Front Lambda Oxygen O2 Sensor 03L906262P for Audi A1 A3 A4 A5 A6 A7 A8","description":"\u003cp\u003eIf you're chasing a check engine light, a rough idle, or fuel economy that's quietly gotten worse, the front oxygen sensor is one of the first places to look. This listing is for a brand new, aftermarket \u003cstrong\u003eAudi A4 A6 oxygen sensor\u003c\/strong\u003e — a 5-wire front (upstream) lambda sensor, OE part number 03L906262P, built to read correctly on a wide range of Audi and other Volkswagen Group vehicles. It's not used or reconditioned; it's a straightforward, correctly-wired replacement for a sensor that wears out on every car eventually.\u003c\/p\u003e\n\n\u003ch2\u003eWhy the front sensor matters more than people think\u003c\/h2\u003e\n\n\u003cp\u003eThere are usually two oxygen sensors per bank on these engines: one upstream (front, pre-catalytic converter) and one downstream (rear, post-cat). The rear sensor mostly just checks that the catalytic converter is doing its job. The front sensor is the one the ECU actually listens to for fuel trim — it measures oxygen content in the exhaust leaving the engine in real time and tells the ECU whether the mixture is running rich or lean, feedback the ECU uses constantly to adjust injector pulse width and keep combustion close to ideal.\u003c\/p\u003e\n\n\u003cp\u003eWhen a front lambda sensor starts to drift or fail — usually from age, oil contamination, or a degraded sensing element — that feedback loop breaks down, the ECU falls back to a fixed map or compensates incorrectly, and that's when you notice it in how the car drives and what it costs to run.\u003c\/p\u003e\n\n\u003ch2\u003eSymptoms of a failing front O2 sensor\u003c\/h2\u003e\n\n\u003cp\u003eA tired or failing upstream sensor doesn't always announce itself with a dramatic failure. More often it shows up as a handful of smaller annoyances that add up:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eCheck engine light on, often with fault codes pointing to O2 sensor circuit performance or fuel trim being out of range\u003c\/li\u003e\n\u003cli\u003eNoticeably worse fuel economy, since the ECU can't fine-tune the air\/fuel mixture without accurate feedback\u003c\/li\u003e\n\u003cli\u003eRough or uneven idle, hesitation on acceleration, or a slight surge at steady cruising speed\u003c\/li\u003e\n\u003cli\u003eA failed emissions or MOT-style test, since incorrect fuel trim skews tailpipe readings even if the catalytic converter itself is fine\u003c\/li\u003e\n\u003cli\u003eA faint sulfur or \"rotten egg\" smell from the exhaust in some cases, as the mixture runs rich\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eNone of these are exclusive to a bad O2 sensor — a vacuum leak or a tired coil can look similar — but if you've got a check engine light with an oxygen sensor or fuel trim code stored, and the sensor is original or unknown-age, it's a cheap part to rule out first.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eType: Front (upstream) lambda \/ oxygen sensor\u003c\/li\u003e\n\u003cli\u003eWiring: 5-wire connector\u003c\/li\u003e\n\u003cli\u003eCondition: Brand new, aftermarket (unbranded)\u003c\/li\u003e\n\u003cli\u003eQuantity: 1x sensor\u003c\/li\u003e\n\u003cli\u003ePrimary OE reference: 03L906262P\u003c\/li\u003e\n\u003cli\u003eAlso cross-references to: 03G906262A, 03G906262C, 03G906262D, 03G906262F, 03G906262H, 03G906262N, 03L906262, 03L906262B, 03L906262F, 03L906262J, 03L906262K, 03L906262S, 045906262, 057906262D, 057906262F, 059906262, 059906262B, 059906262F, 059906262H, 059906262J, 059906262K, 070906262B, 1K0998262AD, 8200406337, 8200230256, 8200351037, 8200616106, 8R0906262, 03C906262D, 0281004027, 0281004085, 0281004086, 0258017052, 0258017111, 0281004148\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAlways match the OE number against your existing sensor or your service documents before ordering — the same platform can carry more than one variant depending on engine and model year.\u003c\/p\u003e\n\n\u003ch2\u003eAudi A4, A6 and Other Audi Models This Oxygen Sensor Fits\u003c\/h2\u003e\n\n\u003cp\u003eThis is a genuinely shared Volkswagen Group part, and it covers a long run of Audi models:\u003c\/p\u003e\n\n\u003cp\u003eA1 (8X1, 8XK) 2.0 from 2011+; A1 Sportback (8XA, 8XF) 2.0 from 2011+; A3 (8P1) 1.9\/2.0, 2003–2012; A3 Cabriolet (8P7) 1.9\/2.0, 2008–2013; A3 Sportback (8PA) 1.9\/2.0, 2004–2013; A4 (8K2, B8) 2.0\/2.7\/3.0, 2007–2015; A4 Allroad (8KH, B8) 2.0\/3.0 quattro, 2009–2016; A4 Avant (8K5, B8) 2.0\/2.7\/3.0, 2008–2015; A5 (8T3) 2.0\/2.7\/3.0, 2007–2017; A5 Cabriolet (8F7) 2.0\/2.7\/3.0, 2009–2017; A5 Sportback (8TA) 2.0\/2.7\/3.0, 2009–2017; A6 (4F2, C6) 2.0\/2.7\/3.0, 2004–2019; A6 Allroad (4FH\/C6, 4GH\/4GJ) 2.7\/3.0, 2006–2014; A6 Avant (4F5\/C6) 2.7\/3.0, 2005–2011; A6 Avant (4G5\/C7\/4GD) 2.0\/3.0, 2011–2019; A7 Sportback (4GA) 3.0, 2010–2018; A8 (4H2\/4H8\/4HC\/4HL) 3.0\/4.2 quattro, 2009–2018; and TT (8J3)\/TT Roadster (8J9) 2.0 quattro, 2008–2014.\u003c\/p\u003e\n\n\u003cp\u003eIf you're working on an \u003cstrong\u003eAudi A4 or A6\u003c\/strong\u003e from the B8\/C6\/C7 era, this is one of the most common front sensor part numbers you'll come across, since those platforms were built in huge numbers with this same emissions setup.\u003c\/p\u003e\n\n\u003ch2\u003eAlso fits the wider Volkswagen Group lineup\u003c\/h2\u003e\n\n\u003cp\u003eBecause Audi, Volkswagen, SEAT, and Skoda share engines and emissions hardware across the same corporate platforms, this sensor and its OE numbers turn up well beyond Audi badges. It also fits Porsche Cayenne (92A) 3.0 Diesel (2010–2019) and Macan (95B) 3.0S Diesel (2014–2019); SEAT Alhambra, Altea, Altea XL, Cordoba, Exeo, Ibiza III\/IV, Leon, and Toledo III; Skoda Fabia II\/Combi, Octavia II\/Combi, Roomster\/Praktik, Superb II\/Kombi, and Yeti; and Volkswagen Amarok, Beetle\/Cabriolet, Caddy III\/IV, Crafter, EOS, Golf Plus\/V\/V Variant\/VI\/VI Cabriolet\/VI Variant, Jetta III\/IV, Multivan V\/VI, Passat\/Alltrack\/CC\/Variant, Phaeton, Polo, Scirocco, Sharan, Tiguan, Touareg, Touran, and Transporter V\/VI. Match the OE number against the list above to confirm fitment — with a shared-platform part like this, the number is more reliable than the model name alone.\u003c\/p\u003e\n\n\u003cp\u003eTo understand more about what this sensor actually measures and why it matters for emissions control, the \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Oxygen_sensor\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eWikipedia article on oxygen sensors\u003c\/a\u003e is a solid, plain-language technical reference.\u003c\/p\u003e\n\n\u003ch2\u003eFitting notes and what's in the box\u003c\/h2\u003e\n\n\u003cp\u003eYou're getting one brand new, unbranded aftermarket front oxygen sensor, 5-wire, ready to install. As with any O2 sensor swap, a light coat of anti-seize on the threads (keeping it off the tip and slots) makes future removal easier, and the connector should click in fully so the ECU gets a clean signal. If you clear codes after fitting, give the car a proper drive cycle first — fuel trim codes often need a few warm-up cycles to fully reset.\u003c\/p\u003e\n\n\u003cp\u003eWe stock this as part of our \u003ca href=\"\/collections\/electrical-parts\"\u003eElectrical Parts range\u003c\/a\u003e and our \u003ca href=\"\/collections\/exhaust-parts\"\u003eExhaust \u0026amp; Emissions collection\u003c\/a\u003e, alongside other sensors and emissions components for Audi and Volkswagen Group vehicles — see our dedicated \u003ca href=\"\/collections\/audi\"\u003eAudi parts collection\u003c\/a\u003e and \u003ca href=\"\/collections\/volkswagen\"\u003eVolkswagen parts collection\u003c\/a\u003e if you're sourcing more than one item for the same car.\u003c\/p\u003e\n\n\u003ch2\u003eQuestions before you order?\u003c\/h2\u003e\n\n\u003cp\u003eCross-referencing an O2 sensor against your chassis code and engine can be fiddly, and we'd rather you check than guess. If you're not sure this is right for your car, \u003ca href=\"\/pages\/contact\"\u003eget in touch with our team\u003c\/a\u003e before ordering, or check our \u003ca href=\"\/pages\/faq\"\u003efrequently asked questions\u003c\/a\u003e for common fitment queries. Once ordered, follow it through our \u003ca href=\"\/pages\/track-order\"\u003eorder tracking page\u003c\/a\u003e, and our \u003ca href=\"\/pages\/shipping\"\u003eshipping information page\u003c\/a\u003e covers dispatch and delivery. Every sensor we sell is backed by our \u003ca href=\"\/pages\/warranty\"\u003ewarranty policy\u003c\/a\u003e. If you need a part that isn't listed yet, our \u003ca href=\"\/pages\/request-a-part\"\u003erequest a part\u003c\/a\u003e page is the quickest way to ask us to source it.\u003c\/p\u003e\n","brand":"EasyLife Auto Parts","offers":[{"title":"A","offer_id":49912370364644,"sku":"CJQT310232901AZ","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0740\/0502\/0900\/files\/99f9be63-c84c-4504-bc4a-61fb63d7c750.jpg?v=1789827862","url":"https:\/\/easylifeautoparts.com\/products\/front-lambda-oxygen-o2-sensor-03l906262p-for-a-udi-a1-a3-a4-a5-a6-a7-a8-q3-q5-q7","provider":"Easy Life Auto Parts","version":"1.0","type":"link"}