11787595353 Oxygen Sensor 0258027005 234-5026 BMW 1 3 7 Series MINI AKAS

• Description:
• The AKAS Upstream Oxygen Sensor (also known as a pre-catalytic lambda sensor or before-cat O2 sensor) is a direct-fit replacement for the front oxygen sensor located BEFORE the catalytic converter on BMW, MINI, and Rolls-Royce vehicles equipped with the N13, N18, or N74 engine - including the BMW 1 Series F20/F21 (2010-2016), 3 Series F30/F31 (2011-2016), 7 Series F01/F02/F03 (2007-2015), MINI R55-R61 LCI models (2009-2016), and Rolls-Royce Ghost RR4, Wraith RR5, and Dawn RR6 (2008-2019). If your vehicle shows unstable idling, difficult starting, excessive fuel consumption, or a check engine light with oxygen sensor fault codes - a failed upstream oxygen sensor is one of the most common causes on turbocharged N13/N18 engines and V12 N74 engines.
• This sensor monitors the oxygen content in the exhaust gas BEFORE it enters the catalytic converter, allowing the engine control unit (ECU/DME) to precisely adjust the air-fuel ratio for optimal combustion, power delivery, fuel economy, and emissions control. A degraded or failed upstream sensor sends incorrect or slow data to the ECU, causing the engine to run too rich or too lean - resulting in rough idling, poor acceleration, reduced power, increased fuel consumption, and an illuminated check engine light. Replacing the sensor with this OE-matched unit (11787595353, also cross-referenced as 0258027005) restores proper air-fuel ratio monitoring, clears the fault codes, and returns your engine to smooth, efficient operation.
• Manufactured to OEM-equivalent specifications with a stainless steel housing, high-temperature alloy probe, and precision zirconia sensing element, this sensor delivers fast, accurate signal response even under harsh exhaust conditions. It features the original electrical connector for true plug-and-play installation - no wiring modification, no coding required. Made with premium materials and widely adopted by professional auto repair workshops, this sensor offers simple installation and reliable performance. Professional installation by a qualified auto electrician or BMW specialist is recommended.
• characteristics:
• 1. Exact OE Match - Direct Fit Upstream Sensor This sensor is a precise direct-fit replacement for BMW OE number 11787595353 (also cross-referenced as Bosch 0258027005) - the upstream (pre-catalytic / before cat / Bank 1 Sensor 1) oxygen sensor used across the N13 1.6L turbo, N18 1.6L turbo, and N74 6.6L V12 twin-turbo engine family. The mounting thread, overall length, electrical connector, and signal output characteristics match the original sensor exactly - no modification, no adapter, no wiring splicing required. Before purchasing, verify your original sensor part number is 11787595353, or confirm your vehicle is equipped with the N13, N18, or N74 engine and requires the upstream (before cat) sensor - not the downstream (after cat) sensor, which has a different part number.
• 2. Restores Air-Fuel Ratio Control - Fixes Rough Idle & High Fuel Consumption The upstream oxygen sensor is the primary sensor the ECU uses to adjust the air-fuel mixture in real time - it measures oxygen content in the exhaust before the catalytic converter and sends a rapid voltage signal to the ECU, which then adjusts fuel injector pulse width to maintain the ideal 14.7:1 stoichiometric air-fuel ratio. When this sensor fails - common on high-mileage N13/N18 turbo engines and N74 V12 engines, often caused by heat degradation, oil contamination, fuel additive buildup, or internal wear - the ECU receives an incorrect or slow signal and cannot properly adjust fuel delivery, causing the engine to run too rich (excess fuel, black smoke, high fuel consumption, fouled spark plugs) or too lean (detonation, loss of power, overheating, catalytic converter damage). Symptoms include unstable idling, difficult starting, excessive fuel consumption, reduced acceleration, and an illuminated check engine light with codes such as P0130 (circuit malfunction), P0131 (low voltage), P0132 (high voltage), P0133 (slow response), or P0135 (heater circuit malfunction). Replacing it with this OE-matched unit restores real-time air-fuel ratio monitoring, allows the ECU to resume precise fuel control, and - after clearing codes - eliminates rough idling, restores power and acceleration, and reduces fuel consumption to normal levels.
• 3. Fast-Response Precision Sensing - Stable Signal Under Harsh Exhaust Conditions Manufactured with a premium high-temperature alloy probe plus an oxidation-resistant stainless steel outer shell, this sensor is engineered to withstand the extreme heat, vibration, and corrosive exhaust gases directly in front of the catalytic converter - where temperatures can exceed 600 C under load. The high-precision zirconia sensing element captures real-time exhaust oxygen concentration with minimal signal deviation and fast response time (typically <100ms to switch between rich and lean signals), delivering accurate air-fuel ratio feedback to the ECU for optimal combustion efficiency and fuel economy. An anti-carbon-build-up and anti-corrosion surface treatment resists erosion from hot exhaust fumes and impurities, prolonging service life - unlike cheap aftermarket sensors that can become contaminated, drift out of calibration, or fail completely after 20,000-50,000 km, causing recurring check engine lights, poor fuel economy, and potential catalytic converter damage from prolonged rich or lean operation. The integrated heating element ensures the sensor reaches its optimal operating temperature quickly after cold start and maintains it consistently during extended idling or low-speed city driving, where exhaust gas temperatures are lower and unheated sensors would provide inaccurate readings.
• 4. Ultra-Wide Model Coverage - BMW, MINI & Rolls-Royce, 3 Engine Types This upstream oxygen sensor fits an exceptionally broad range of premium vehicles powered by the N13 1.6L turbo, N18 1.6L turbo, or N74 6.6L V12 twin-turbo engine: BMW 1 Series F20 (2010-2015) / F20 LCI (2014-2016) / F21 (2011-2015) / F21 LCI (2014-2016); BMW 3 Series F30 (2012-2015) / F30 LCI (2015-2016) / F31 (2011-2015); BMW 7 Series F01 (2007-2012) / F01 LCI (2011-2014) / F02 (2007-2012) / F02 LCI (2011-2015) / F03 (2008-2012) / F03 LCI (2012-2015); MINI R56 LCI (2009-2013), Clubman R55 LCI (2009-2014), Cabrio R57 LCI (2009-2015), Coupé R58 (2010-2015), Roadster R59 (2011-2015), Countryman R60 (2010-2016), Paceman R61 (2012-2016); and Rolls-Royce Ghost RR4 (2008-2019), Wraith RR5 (2012-2019), Dawn RR6 (2015-2019). This unprecedented coverage makes it ideal for BMW, MINI, and Rolls-Royce repair workshops and independent specialists - one SKU covers entry-level 1 Series, mid-range 3 Series, flagship 7 Series, sporty MINI Cooper S, and ultra-luxury Rolls-Royce vehicles. For vehicle owners, this means you can buy with confidence knowing the sensor fits your specific vehicle - no guesswork, no compatibility worries. Note: This is the upstream (before cat) sensor only; it does NOT replace the downstream (after cat) sensor, which has a different part number and function.
• Product Specifications
• Product Type: Upstream (Pre-Catalytic / Before Cat) Oxygen Sensor (Lambda Sensor / O2 Sensor)
• Compatible Brands: BMW, MINI, Rolls-Royce
• Compatible Engines: N13 (1.6L turbo), N18 (1.6L turbo), N74 (6.6L V12 twin-turbo)
• OE Part Number: 11787595353
• Cross-Reference: Bosch 0258027005
• Position: Upstream / Before Catalytic Converter / Pre-Cat / Bank 1 Sensor 1
• Sensing Element: Zirconium dioxide (ZrO2), heated, fast-response switch-type
• Thread Size: M18 × 1.5
• Connector: Original electrical connector (plug and play)
• Housing Material: Stainless steel with high-temperature alloy probe
• Heat Resistance: Anti-corrosion, anti-carbon-build-up surface treatment
• Response Time: < 100ms (rich/lean switch)
• Installation: Direct fit, screw-in - no modification or coding required
• Installation Time: 30-60 minutes (professional)
• Tools Required: 22mm oxygen sensor socket, basic socket set, jack + axle stands, BMW-compatible OBD2 scan tool (to clear codes)
• Warranty: 6-month limited warranty (manufacturing defects)
• Compatible Models
• BMW 1 Series: F20 (2010-2015), F20 LCI (2014-2016), F21 (2011-2015), F21 LCI (2014-2016)
• BMW 3 Series: F30 (2012-2015), F30 LCI (2015-2016), F31 (2011-2015)
• BMW 7 Series: F01 (2007-2012), F01 LCI (2011-2014), F02 (2007-2012), F02 LCI (2011-2015), F03 (2008-2012), F03 LCI (2012-2015)
• MINI: R56 LCI (2009-2013), R55 Clubman LCI (2009-2014), R57 Cabrio LCI (2009-2015), R58 Coupé (2010-2015), R59 Roadster (2011-2015), R60 Countryman (2010-2016), R61 Paceman (2012-2016)
• Rolls-Royce: Ghost RR4 (2008-2019), Wraith RR5 (2012-2019), Dawn RR6 (2015-2019)
• Note: This is the upstream (before cat) sensor only. Does NOT replace the downstream (after cat) sensor.
• Common Fault Codes Resolved
• P0130 (O2 Sensor Circuit Malfunction - Bank 1 Sensor 1), P0131 (Low Voltage), P0132 (High Voltage), P0133 (Slow Response), P0134 (No Activity Detected), P0135 (O2 Sensor Heater Circuit Malfunction - Bank 1 Sensor 1)
• What's in the Box
• 1 × Upstream Oxygen Sensor (Before Kat / Pre-Catalytic Lambda Sensor), OE 11787595353
• COMPATIBILITY CHECK: This sensor fits BMW N13/N18/N74 engines only. Verify your original sensor part number is 11787595353 before purchasing. This is the UPSTREAM (before cat / Bank 1 Sensor 1) sensor - it does NOT replace the downstream (after cat / Bank 1 Sensor 2) sensor, which has a different part number and function. Confirm which sensor has failed using your diagnostic scan tool before purchasing.
• PROFESSIONAL INSTALLATION RECOMMENDED: The sensor is located in the exhaust manifold or downpipe BEFORE the catalytic converter, often requiring removal of engine covers, heat shields, or underbody panels for access. While installation is straightforward for a competent DIYer (22mm oxygen sensor socket + 30-60 min), professional installation by a qualified BMW specialist is recommended, especially for 7 Series and Rolls-Royce models where access may be more complex. Always wait for the exhaust system to cool completely before attempting removal - the exhaust manifold and sensor can be over 600 C immediately after driving.
• FAULT CODE CLEARING & ADAPTATION REQUIRED: After installation, you MUST clear the existing ECU fault codes using a BMW-compatible OBD2 scan tool (basic OBD2 readers may not access BMW-specific adaptation functions - an INPA/ISTA, Foxwell NT510, Autel, or similar BMW-compatible tool is recommended). Simply installing the new sensor will NOT automatically turn off the check engine light. After clearing codes, you may need to perform an oxygen sensor adaptation reset (some BMW models require this), then drive the vehicle for 20-30 minutes (including city and highway driving) to allow the ECU to complete its oxygen sensor and fuel trim adaptation cycles. If the check engine light returns, re-scan for codes - it may indicate a separate issue such as a failing downstream sensor, an exhaust leak before the sensor, a vacuum leak, or a fuel system problem.
• SEIZED SENSOR REMOVAL: On high-mileage vehicles, especially in coastal areas (Cape Town, Durban, Port Elizabeth), the old sensor may be severely seized due to heat and corrosion in the exhaust manifold or downpipe. Apply penetrating oil (WD-40, CRC 5-56, Q20) to the threads and allow 15-30 minutes to soak before removal. Do NOT use excessive force - this can round off the sensor hex, strip the exhaust port threads, or crack the exhaust manifold. If severely seized, seek professional assistance. On some BMW models, the sensor may be located in a difficult-to-reach position - a flexible oxygen sensor socket or crowfoot wrench may be required.
• ANTI-SEIZE & TORQUE: Apply a thin layer of copper-based anti-seize compound to the new sensor's threads before installation (if not pre-applied). DO NOT allow anti-seize to contact the sensing element - contamination will poison the sensor and cause failure. Tighten to 40-50 Nm (30-37 ft-lbs). Do NOT overtighten - this can strip the exhaust manifold threads or crack the sensor's ceramic element. Ensure the sensor's wiring is routed away from hot exhaust components and moving parts, and secured with the original wiring clips to prevent heat damage or vibration-induced wire fatigue.
• WARRANTY: 6-month limited warranty covering manufacturing defects under normal use and correct installation. Does not cover damage from incorrect installation, contamination, physical impact, exhaust leaks, or normal wear. This is an aftermarket replacement part - BMW, MINI, Rolls-Royce, N13, N18, N74, F20, F30, F01, and OE numbers are used for identification and compatibility purposes only.

What's in the box
1 X Oxygen Sensor Before Kat