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Wideband UEGO Air/Fuel Ratio Gauge 52mm (2-1/16”) with 4.9 LSU Sensor, Digital AFR Controller Gauge, Wideband O2 Control 【AIR/FUEL RATIO UEGO GAUGE】Our wideband O2 AFR gauge has a digital LED display and LED "needle" that changes color as thANDO RACING 
30-0300 X-Series 52mm (2-1/16”) Wideband UEGO Air/Fuel Ratio Gauge with LSU 4.9 Sensor Controller Gauge with Wideband Ox Wide Compatibility: The wideband o2 sensor gauge provides 0-5V analog and serial RS-232 output. Compatible with vehicle/
52mm AFR O2 UEGO Wideband Air Fuel Ratio Gauge Kit 30-4110 LSU 4.9 Probe Sensor ※The AFR gauge monitoring tool provides accurate data that is essential to a safe and powerful tune. ※Gauge Display/0-5VAEM 
AEM 52mm Wideband UEGO Air Fuel Ratio Sensor Controller Gauge w/White Face Kit X-Series Wideband UEGO AFR Controller Gauge were fastest responding wideband air/fuel ratio controllers in an independen
Air Fuel Ratio Gauge 52mm/2inch 12V Precise AFR Gauge Kit with O2 Oxygen leUWT It can improve vehicle performance and make driving safer. [Good Material] This air fuel ratio gauge is made of high quaARTILAURA 
ARTILAURA 2-1/16" 52mm LED Digital Air/Fuel Ratio Gauge Racing with Narrowband O2 Oxygen Sensor for 12V Car 【Function】LCD Color Screen, LED display for easy reading in the darkness.Best Value Innovate Motorsports 
Innovate Motorsports 3918 MTX Series MTX-L Plus Wideband Gauge, Black/White, 52mm FASTER Sensor Frequency for faster O2 sensor feedback. Digital display in AFR or Lambda52mm AFR O2 UEGO Wideband Air Fuel Ratio Gauge Kit 30-4110 LSU 4.9 Probe Sensor ※The AFR gauge monitoring tool provides accurate data that is essential to a safe and powerful tune. 52mm AFR O2 UEGO WiIOIUSKKU IOIUSKKU Wideband 02 UEGO Air Fuel Ratio Gauge Kit Oxygen Afr Fuel Ratio Gauge Air Fuel Ratio Wideband Sensor Ratio Gaug Accurate Wideband 02 UEGO Gauge: Ensure precise air ratio readings with our reliable Wideband Sensor Kit. Easy to instal52mm AFR O2 UEGO Wideband Air Fuel Ratio Gauge Kit 30-4110 LSU 4.9 Probe Sensor Gauge Display/0-5V Output Gasoline values from 10:1 to 20:1 AFR. 0-5V Output E85 values from 6.6 to 13.2:1 AFR. 0-5V OutKIMISS KIMISS Air Fuel Ratio AFR Gauge Kit, 52mm Car Air Fuel Ratio Gauge LED Blue Digital for 12V 4/6/8 Cylinder Gasoline Vehi Fitment --------- Suitable for 12V, 4 / 6 / 8 cylinder and gasoline vehicle. Add the look and feel of a racing car to yotieedhfu tieedhfu Wideband 02 UEGO Air Fuel Ratio Gauge Kit Oxygen Oxygen Sensor Sensor Afr Air Fuel Ratio Ratio Gauge Wideband C Accurate Wideband 02 UEGO Gauge: Ensure precise air ratio readings with our reliable Wideband Sensor Kit. Easy to instalAEM X-Series Wideband 02 UEGO Air Fuel Ratio Gauge Kit 30-0300 This creates the perception of a larger overall gauge, but in a common 52mm size for easy mounting. An Auto Dimming featInnovate Motorsports Innovate Motorsports 3891 DLG-1 Dual Lambda Oxygen Gauge Kit Monitor left and right exhaust banks on one single gauge52mm Air Fuel Ratio Gauge Digital Display With Narrowband O2 Oxygen Sensor Kit 52mm/2in universal gauge fits for 12.0V motorcycle, car, truck, gasoline engine. 1 Oxygen Sensor. 1 Air Fuel Ratio GaugeHUNJK654DE 1Set 30-0300 Broadband Air/Fuel Ratio AFR Gauge Kit Oxygen Sensor 028017025 Wideband (Color : Black) ?Perfect match with the car52mm AFR O2 UEGO Wideband Air Fuel Ratio Gauge Kit 30-4110 LSU 4.9 Probe Sensor The AFR gauge monitoring tool provides accurate data that is essential to a safe and powerful tune. Gauge Display/0-5V OSaZaK SaZaK 2 in 1 Meter 52MM Narrowband Digital Air Fuel Ratio Gauge Kit 12 V Car Volmeter with O2 Oxygen Sensor Car Modifica 💌2-in-1 car meter shows the air-fuel ratio and battery voltage, accurate and easy to view.52mm 2-1/16" AFR O2 UEGO Wideband Air Fuel Ratio Gauge Kit 30-0300 4.9 LSU senso 52mm AFR O2 UEGO Wideband Air Fuel Ratio Gauge Kit. 1 UEGO Gauge. The AFR gauge monitoring tool provides accurate data tInnovate Motorsports Innovate Motorsports (3795) DB BLUE Wideband Air/Fuel Gauge Kit includes LC-2 & Bosch LSU 4.9 Patented DirectDigital Wideband TechnologyAEM X-Series Wideband 02 UEGO Air Fuel Ratio Gauge Kit 30-0300 X-Series Wideband 02 UEGO Air Fuel Ratio Gauge Kit. An Auto Dimming feature is included. Locking connectors ensure a posInnovate Motorsports Innovate Motorsports 3892 38920 PSB-1: POWERSAFE Boost & AIR/Fuel Ratio Gauge KIT All-in-one, boost safety override and wideband air/fuel ratio gauge52mm AFR O2 UEGO Wideband Air Fuel Ratio Gauge Kit 30-4110 LSU 4.9 Probe Sensor The AFR gauge monitoring tool provides accurate data that is essential to a safe and powerful tune. Gauge Display/0-5V OInnovate Motorsports Innovate Motorsports 3924 39240 MTX-L Plus: Advanced Digital WIDEBAND AIR/Fuel Ratio Gauge KIT, 3 FT. Sensor Cable FASTER Sensor Frequency for faster O2 sensor feedbackSAAS Air Fuel Ratio Gauge Wide Band 52mm Digital Series The SAAS Digital Wideband AFR allows you to carefully monitor and tune your vehicle's Air Fuel Ratio throughout the RPMスペシャルパーツ武川 (TAKEGAWA) Special Parts Takegawa Compact LED A/F Meter (Air Fuel Ratio) 05-07-0021 Black Meter PanelAEM X-Series Wideband 02 UEGO Air Fuel Ratio Gauge Kit 30-0300 This creates the perception of a larger overall gauge, but in a common 52mm size for easy mounting. An Auto Dimming featFHZIFOLK Lambda Air Fuel Ratio O2 Oxygen Sensor,Compatible for Volvo S80 XC90 2005-2014 30751865 30774651 234-4451 2344451 234-42 Speed Transition Assistance: Helps the engine speed to transition smoothly, relying on the oxygen content to assist the30% Off 52MM Car AFR Gauge Air Fuel Ratio Gauge 7 Color LED W/ Narrowband Oxygen Sensor 1 Narrowband Oxygen Sensor. 1 Air Fuel AFR Gauge. Air/Fuel Ratio Gauge Specification Oxygen Sensor Specification It is sGeneric Generic 52mm AFR O2 UEGO Wideband Air/Fuel Ratio Gauge Kit - Digital AFR Controller Gauge - 30-4110 Accurately Read: This 52mm AFR O2 UEGO Wideband Air Ratio Gauge Kit accurately measures your vehicle's air ratio, ensuri4x Air Fuel Ratio Oxygen Sensor Complete set Suitable For Toyota RAV4 2001-2003 Compatible with Toyota RAV4 ACA20 ACA21 2.0L 2001-2003. Type: Oxygen Sensor. Oxygen Sensor Resistance: 0.8—1.5 Ω. How toGlowShift GlowShift Black 7 Series Digital Wideband Air/Fuel Ratio AFR Gauge Kit - Includes Oxygen Sensor, Data Logging Output & W GlowShift Black 7 Color Series Digital Wideband Air/Fuel Ratio Gauge is Essential for Tuning & Mapping Out the Air to FuAIR FUEL RATIO SENSOR for TOYOTA LEXUS PRE-CAT FJ Land Cruiser GS450 IS250 200 Lexus IS250. Toyota FJ Cruiser. Lexus LS460. This is the front Pre cat Lambda sensor and 2 are required on most models –BoaTok BoaTok 30-0300 Wideband UGEO Air Fuel Ratio (AFR/Lambda) Gauge & Controller Kit - 52mm (2-1/16") Digital Gauge with LSU 【Excellent helper】 The wideband meter has a double-sided reversible panel with a 24-color LED display and a four-digit cWUISOLQP WUISOLQP Wideband 02 UEGO Air Fuel Ratio Gauge Kit Wideband Fuel Ratio Gauge Car Oxygen Sensor Sensor Ratio Gauge Air Fu Accurate Wideband 02 UEGO Gauge: Ensure precise air ratio readings with our reliable Wideband Sensor Kit. Easy to instalNFONBLON 1PCS Oxygen Sensor O2 Sensor Air Fuel Ratio Sensor，Compatible with Civic 1.8L 2006-2013 CRV 2.0L 36532-RNA-A01 36532RNAA Tip: Please confirm your delivery address, product part number, external shape and size, model year compatibilityX AUTOHAUX X AUTOHAUX 39210-2G600 Air Fuel Ratio O2 Oxygen Sensor Replacement Front for Hyundai IX35 2.0L 2010 Plastic Fitment: for Hyundai IX35 2.0L 2010SaZaK SaZaK 2 in 1 Meter 52MM Narrowband Digital Air Fuel Ratio Gauge Kit 12 V Car Volmeter with O2 Oxygen Sensor Car Modifica 💌2-in-1 car meter shows the air-fuel ratio and battery voltage, accurate and easy to view.AUTO METER Auto Meter 3670 Sport-Comp II 2-1/16" Wideband Air/Fuel Ratio Analog Gauge Modern white LED through-the-dial lighting provides clear visibility during nighttime useDenso Denso 234-9123 Oxygen Sensor (Air and Fuel Ratio Sensor) Manufactured to detect the amount of exhaust gas air fuel ratioX AUTOHAUX X AUTOHAUX Air Fuel Ratio O2 Oxygen Sensor Replacement for Mazda 3 2010-2013 L54118861A 250-24872 Plastic [] Oxygen sensor features double protection layer, aluminum oxide layer, PTFE filter and stainless steel housing.Ombialo Ombialo 30-4110 UEGO Air Fuel Ratio Gauge 52mm with 4.9 LSU Sensor, wideband Sensor WideBand A/F Ratio UEGO O2 Controlle 【Replace】The uego air/fuel ratio kit replace 30-4110, with interchangeable black and white panelsGeneric Wideband 02 UEGO Air Fuel Ratio Gauge Kit Afr Oxygen Sensor Wideband Oxygen Sensor Fuel Ratio Gauge Ratio Gauge Air Accurate Wideband 02 UEGO Gauge: Ensure precise air ratio readings with our reliable Wideband Sensor Kit. Easy to instalGeneric 17025 0258017025 LSU 4.9 5-Wire Lambda WideBand O2 Oxygen Sensor Compatible with AEM 30-4110, 30-0300, 30-0310 - X Serie IMPROVE ENGINE EFFICIENCY: Our high-performance wideband sensor constantly monitors the amount of oxygen in your car's eGeloo Geloo X Series 30-0300 Wideband UEGO Air Fuel Ratio Gauge, 52mm (2-1/16"), 4.9 LSU Sensor, Digital AFR Controller, O2 Co 【WIDELY APPLICABLE】The 52 mm (2-1/16 in) wideband gauge housing fits and mounts easily in most instrument pods. With 0-5SaZaK SaZaK 2 in 1 Meter 52MM Narrowband Digital Air Fuel Ratio Gauge Kit 12 V Car Volmeter with O2 Oxygen Sensor Car Modifica 💌2-in-1 car meter shows the air-fuel ratio and battery voltage, accurate and easy to view.Denso Denso 234-9049 Air Fuel Sensor Efficient Fuel ConsumptionGeloo Geloo X Series 30-0300 Wideband UEGO Air Fuel Ratio Gauge, 52mm (2-1/16"), 4.9 LSU Sensor, Digital AFR Controller, O2 Co 【WIDELY APPLICABLE】The 52 mm (2-1/16 in) wideband gauge housing fits and mounts easily in most instrument pods. With 0-5YINETTECH YINETTECH 2pcs M18x1.5mm Hexagonal Oxygen Sensor Screw Plug with Copper Washer Suitable for Replacing The Reducing Pipe Perfect function: Together with sensors, it helps adjust the air fuel ratio of the car engine, with good airtightness, wGeneric Wideband 02 UEGO Air Fuel Ratio Gauge Kit Sensor Air Fuel Ratio Oxygen Sensor Oxygen Afr Car Wideband Ratio Gauge Accurate Wideband 02 UEGO Gauge: Ensure precise air ratio readings with our reliable Wideband Sensor Kit. Easy to instalTuningsworld 4 Pcs Air Fuel Ratio Oxygen Sensor Complete for Toyota Rav4 2001 2002 2003 8946742020 8946542090 8946542100 Fit for Toyota RAV4 2001 2002 2003AIMALL AIMALL Replacement Carburetor Compatible with Stens 616-428, Ryobi 308054013, Homelite 308054013, Zama C1U-H60, 2.16 x 1 🔧 Durable Build for Long-Term Use: Made from high-quality materials: Ensures a long-lasting, reliable performance for cU.S. Polo Assn. 52mm 7-Color Backlight Car Modification Instrument LCD Display Car Tachometer, Voltmeter, Air-Fuel Ratio Table (Color : 1. High-definition transparent lens, double display of royal blue digital display and illuminated pointer, black chassisLiterary Licensing, LLC Optimum Power and Economy Air-Fuel Ratios for Liquefied Petroleum Gasses BNNPSXCJ Car Downstream Air Fuel Ratio O2 Oxygen Lambda Sensor 89465-06220，Compatible for Toyota Camry AURION HV Hybrid 3.5L 2006 Monitored information of oxygen content in the exhaust into signals and transmits them to the engine control unit (ECU)Dasbecan Dasbecan 234-9041 Oxygen Sensor Upstream Compatible with Lexus ES350 RX350 Toyota Camry Highlander Rav4 Solara Avalon Sc Compatible with Toyota: Camry 2.4L 2003-2007, Camry 2.4L Electric/Gas 2007-2011, Camry 3.5L 2007, Highlander 2.4L 2001-2McGraw-Hill Education Aircraft Powerplants: Powerplant Certification, Tenth Edition Brilluxa 7 Color Pointer Air/Fuel Ratio Meter, Black Automotive Gauge with Pointer and LED Digital Readout Large Mirror, 2-1/16 5 Allows you to monitor your engines air to fuel mixture, ensuring it is at optimal levels, reduced and better fuel econom27% Off Denso Denso 234-3052 Oxygen Sensor (Air and Fuel Ratio Sensor) Designed to detect the amount of oxygen in the exhaust systemBosch New Wiper Blade, Single, 500MM For HYUNDAI #AP500U XTevu XTevu Universal Air Fuel Ratio Gauge Pointer LED Digital Display 52mm Dia High Accuracy Auto Instrument Fuel Pointer AFR Red pointer well contrasts with the black dial, plus the clear numbers, you can easily and clearly get results.JKAPCYJFHF Air Fuel Ratio Sensor and Oxygen Sensor MR514427 are Suitable for Mitsubishi Lancer 1.3L 1.6L- Condition:New |Brand:Unbranded|Number of Sensors:1|Type:Oxygen Sensor|Interchange Part Number:MR51XTevu XTevu 52mm Black 7 Color Pointer Air Fuel Ratio Gauge Auto Car Instrument Accessory AFR Meter Electronic Digital Auto In Allows you to monitor your engines air to fuel mixture, ensuring it is at optimal levels, reduced output and better fuelDropwater Upstream Air Fuel Ratio Oxygen Sensor Compatible with NISSAN 370Z ALTIMA ARMADA FRONTIER MAXIMA MURANO Front O2 Sensor 2 Interchange Part Number: 234-9135EPMAN Epman Racing 52mm Smoked LED Digital Air Fuel Ratio AFR Gauge EP-GA50AIFR NECATUO NECATUO 234-9021 Upstream O2 Oxygen Sensor Heated Air Fuel Ratio Compatible with Toyota Avalon Sienna Solara Lexus ES300 Vehicle Fitment (234-9021 Upstream,Set of 1): Please check Amazon Fitment Filter and Description to see if this item wilAUTO METER Auto Meter 3870 GS 2-1/16" Wideband Air/Fuel Ratio Analog Gauge Modern green LED through-the-dial lighting provides clear visibility during nighttime useDenso Denso 234-9064 Air Fuel Ratio Sensor Manufactured to detect the amount of exhaust gas air fuel ratioDAVRPES DAVRPES 22641-AA160 Air Fuel Ratio AFR Sensor Pre-Cat Upstream Oxygen O2 Sensor 1 for Subaru Outback EZ30 3.0L H6 2003 2 ➤ Compatible Models ➜22641-AA160 oxygen sensor suitable for Subaru Outback EZ30 3.0L H6 2003 2004 2005 2006 2007 2008 20X AUTOHAUX X AUTOHAUX Oxygen Sensor Air Fuel Ratio Downstream O2 Sensor Replacement 11787589475 0258010162 for BMW X5 535i GT XDriv Fitment: for BMW X5 2011-2017, for BMW 535i GT xDrive 2011-2017, for BMW 740Li 2013-2015, for BMW 535i GT 2010-2017, forMSNWJKR 11781742050 Oxygen Sensor, Compatible for BMW E38 E39 E46 E52 E53 E83 E85， Interchangeable Air-Fuel Ratio Oxygen Sensor Automotive oxygen sensors enhance engine power, improve fuel economy, and extend engine lifeManfiscal Lambda Sensor Oxygen Sensor Lambda Air Fuel Ratio O2 Sensor for Hyundai I30 for Kia for Ceed Ceed 39210-2B000 392102B000 ✅✅ Material：This Oxygen Sensor Is Made Of High Quality Plastic And Metal Durable And Resistant To Oxidation And High TemDenso Denso 234-9040 Air Fuel Ratio Sensor Manufactured to detect the amount of exhaust gas air fuel ratio.Material:ZirconiumNGK 4 New NGK IRIDIUM IX Spark Plug DR8EIX # 6681 Sold in packs of 4guniang guniang 2PCS Oxygen O2 Sensor 1 & 2 for 2012-2014 2016 Kia Rio Soul 1.6L; 2013-2014 Dodge Attitude 1.6L Upstream + Downs One Year Quality GuaranteeDenso Denso 234-9002 Air Fuel Ratio Sensor Manufactured to detect the amount of exhaust gas air fuel ratioX AUTOHAUX X AUTOHAUX L556-18-861 Air Fuel Ratio O2 Oxygen Sensor Replacement Rear for Mazda CX-7 2010-2012 2.5L Plastic Fitment: for Mazda CX-7 2010 2011 2012MNDHEJN Car Air Fuel Ratio Lambda O2 Oxygen Sensor A0065421718，Compatible for Benz W166 W463 X164 W166 W251 W222 W447 W906 GL350 Part Number :A0065421718 A 006 542 17 18 A 0065421718 A0065424918 0065421718 0065424918 0281004203Sangyue 4X Oxygen Sensor for Jaguar S-Type X-Type XK8 XKR XJR Vanden Plas Up +Downstream One Year Unlimited Mileage Quality GuaranteeDenso Denso 234-9026 Air Fuel Sensor Efficient Fuel ConsumptionDenso Denso 234-9076 Air Fuel Sensor Single QuantityTOOWGM TOOWGM Air Fuel Ratio Oxygen O2 Lambda Sensor 234-9042 89467-48050 Compatible with Toyota Sienna Highlander Lexus RX330 ★OEM/ PART NUMBER:2349042 89467-48050Denso Denso 234-9001 Air Fuel Ratio Sensor Manufactured to detect the amount of exhaust gas air fuel ratioAUTO METER Autometer 2-1/16" Narrowband Air/Fuel Ratio, Lean-Rich, Phantom (5775) Compatible with factory narrowband O2 sensors (0-1V)Denso Denso 234-9042 Air Fuel Ratio Sensor Manufactured to detect the amount of exhaust gas air fuel ratioDenso Denso 234-9071 Air Fuel Ratio Sensor Manufactured to detect the amount of exhaust gas air fuel ratioDenso Denso 234-9042 Air Fuel Ratio Sensor Manufactured to detect the amount of exhaust gas air fuel ratioCREATESPACE Tuning programmable engine management: How to select, install and tune programmable engine management, working from a ho FXSMFDC O2 Sensor Air Fuel Ratio Sensor for Mazda 3 Bk Bl 5 2.0L 2.3L Mzr 2003-2014 No # Lf8R-18-8G1 Lza07-Md24, Lza07-Md5 Main Function:This Oxygen O2 Sensor is specially designed to improve fuel economy while reducing harmful emissions. HelpELING ELING Original Oxygen Sensor 36531-PNB-004 36531PNB004 Air Fuel Ratio Sender for Honda Original Oxygen SensorDOUKI SH01-18-8G1 SH09-18-8G1 Air Fuel Ratio Lambda Probe O2 Oxygen Sensor for Mazda 3 6 CX-5 CX5 KE GH 2.2 Diesel 2012-2017 D 🚗 Timely replacement: As soon as you notice a Check Engine Light, poor fuel economy, or an erratic idle engine, PleaseWAIKUB MAP Sensors Car Air Fuel Ratio Oxygen Sensor Front Oxygen Sensor For Captur 2015 8200771294 Excellent quality and attractive design, which is beautiful and practical.Denso Denso 234-9088 Air Fuel Ratio Sensor Manufactured to detect the amount of exhaust gas air fuel ratioIndependently published Diesel Engines Technology Made Easy: A Concise Guidebook for Absolute Beginners Routledge Alternative Fuel Vehicles DOUKI 89465-06220 Exhaust Gas Oxygen Sensor for Toyota Lambda Probe Sensors O2 Air Fuel Ratio Replacement 8946506220 89465 062 🚗 Timely replacement: As soon as you notice a Check Engine Light, poor fuel economy, or an erratic idle engine, PleaseNTK NTK (24381) Air/Fuel Ratio Sensor Constructed from durable materialToyota Toyota 89467-34011 Air and Fuel Ratio Sensor Air/Fuel Ratio SensorNISSAN Genuine Nissan 22693-7Y020 Air and Fuel Ratio Sensor Assembly Genuine Nissan OEM productHonda Genuine Honda 36531-RX0-A01 Air Fuel Ratio Sensor CR-V '12-'14 (KA/KC/KX)NTK NTK Air/Fuel Ratio Sensor for 2012 Volkswagen Jetta - 27088 Direct Fit 5-Wire A/F SensorGeneric Performance and emission characteristics of swirl-can combustors to a near-stoichiometric fuel-air ratio / Larry A. Dieh NISSAN Nissan 22693-ZE00A Air Fuel Ratio Sensor Assembly Genuine OEMToyota Toyota Genuine 89467-33080 Air and Fuel Ratio Sensor Air/Fuel Ratio SensorMcGraw Hill Aircraft Powerplants, Ninth Edition NTK NTK Air/Fuel Ratio Sensor for 2020 Volkswagen Golf - 27098 Direct Fit 5-Wire A/F SensorNTK NTK Air/Fuel Ratio Sensor for 2018 Volkswagen Atlas - 27099 Direct Fit 5-Wire A/F SensorCRC Press Air Pollution Control Technology Handbook NTK NTK Air/Fuel Ratio Sensor for 2022 Audi Q5 PHEV - 27103 Direct Fit 5-Wire A/F SensorNTK NTK Air/Fuel Ratio Sensor for 2019 Honda Accord - 27075 Direct Fit 5-Wire A/F SensorNTK NTK Air/Fuel Ratio Sensor for 2009 Dodge Ram 2500-27091 Direct Fit 5-Wire A/F SensorNTK NTK Air/Fuel Ratio Sensor for 2006 Volvo S80-27090 Direct Fit 5-Wire A/F SensorNTK NTK Air/Fuel Ratio Sensor for 2015 Mitsubishi Mirage - 27095 Direct Fit 5-Wire A/F SensorToyota Genuine Toyota (89467-33050) Air Fuel Ratio Sensor Genuine Toyota 89467-33050 Air Fuel Ratio Sensor: Original equipment sensor for precise air-fuel ratio measurementNTK NTK Air/Fuel Ratio Sensor for 2019 Alfa Romeo Giulia - 27094 Direct Fit 5-Wire A/F Sensor