LADA AvtoVAZ land rover Car Exhaust Oxygen Sensor 226A41772R 515mm

• This is a 4-wire heated oxygen sensor (planar-type, regulation/regulating probe). The four wires serve two independent circuits – two for the internal heater (power and ground) and two for the sensor signal and ground. The planar design incorporates a thin, multi-layer ceramic substrate that provides faster light-off and more precise measurement than traditional thimble-type designs.
• The built‑in heating element brings the ceramic sensing tip up to operating temperature very quickly after a cold start, enabling the ECU to enter closed‑loop fuel control sooner and significantly reduce cold‑start emissions.
• The sensor is constructed with a stainless‑steel shell that resists rusting and provides greater dependability.
• The centre ceramic element is composed of Zirconium Oxide, Alumina and Yttrium Oxide. The platinum coating is applied using vapour deposition to ensure an even application.
• A Spinel coating on the outer platinum layer prevents solid particles in the exhaust gas from damaging the component, significantly extending service life.
• Under rich (excess fuel) conditions, the sensor generates a voltage output of approximately 0.6 – 1.0 V. Under lean (excess oxygen) conditions, the voltage falls to near 0 V. The ECU uses this feedback to continuously adjust fuel delivery for optimal combustion efficiency.
• All sensors undergo 100% testing to meet or exceed original equipment quality standards.

This Lambda Sensor is an original equipment (OE) component for multiple manufacturers within the Renault‑Nissan‑Mitsubishi Alliance, Dacia, Lada, Renault Trucks, Smart (Mercedes‑Benz Group), Land Rover, Alpine and Mercedes‑Benz. The following OEM and aftermarket part numbers are known to be cross‑referenced. Always verify physical fitment (connector shape, cable length and thread size) with your original part before purchasing.

• The Intermotor 66000 is the most widely documented aftermarket equivalent, providing the same 4-pin rectangular connector and 425 mm cable length specifications as the OE part.
• This OE number is used across multiple brands and model lines, making it a versatile replacement part.
• Always perform a physical comparison of your old sensor‘s connector shape (rectangular, 4-pin), cable length (425 mm), and thread size (M18 × 1.5) before purchasing, as aftermarket manufacturers may produce sensors with the same OE reference but with slight variations in connector design or calibration parameters.

This Lambda Sensor is used as an upstream (pre‑catalyst) regulating probe across a wide range of vehicles manufactured under the Renault‑Nissan‑Mitsubishi Alliance, as well as LADA, Dacia, Smart and Land Rover. The sensor is installed before the catalytic converter (Bank 1, Sensor 1) and serves as the primary regulating probe for air‑fuel mixture control.

The following engine codes have been documented as compatible with OE number 226A41772R:

• This is an upstream (pre‑catalyst / front) oxygen sensor. It is installed before the catalytic converter (Bank 1, Sensor 1) and serves as the primary regulating probe that directly influences the ECU‘s fuel trim adjustments.
• Upstream and downstream O₂ sensors are not interchangeable in most vehicles. Replacing an upstream sensor with a downstream unit (or vice versa) will result in improper ECU readings and persistent fault codes.
• For most 4‑cylinder vehicles listed above, there are two oxygen sensors: upstream (pre‑cat / regulating) – this part, and downstream (post‑cat / diagnostic) – a different part number.
• Not compatible with older diesel engines without lambda sensors (pre‑Euro 3) – diesel O₂ sensors use different calibration parameters and part numbers.
• The vehicle fitment information above is a guide only. Always confirm compatibility using your vehicle’s VIN, or by physically inspecting your old sensor‘s part number and connector shape before purchasing.

A faulty lambda sensor degrades the ECU’s ability to accurately monitor the air‑fuel mixture. While the engine may still run, fuel economy, emissions and OBD‑II readiness are negatively affected. Replace your lambda sensor immediately if you experience any of the following symptoms.

• Normal wear and tear – Lambda sensors typically degrade after 100,000 – 160,000 km (60,000 – 100,000 miles) of operation due to continuous exposure to high‑temperature exhaust gases (up to 930 °C) and thermal cycling stress.
• Heater circuit failure – The internal heating element opens or shorts (resistance falls outside the expected range). This causes the sensor to respond extremely slowly or not at all when cold, triggering P0030–P0037 codes.
• Contamination (“sensor poisoning”) – Oil, coolant, silicone‑based sealants, or the use of leaded fuel permanently coats the ceramic sensing tip, destroying its ability to detect oxygen. Common sources include worn piston rings / valve seals (oil contamination) and the use of silicone sealants near the exhaust system during maintenance.
• Physical impact damage – Dropping the sensor (even from a low height) or impact from road debris can crack the fragile ceramic element, rendering the sensor inoperative.
• Wiring / connector issues – Damaged wiring, loose connections, corrosion at the connector, or an intermittent open / short circuit can trigger fault codes even when the sensor itself is healthy.
• Exhaust leaks upstream of the sensor – False oxygen readings from an upstream exhaust leak (cracked manifold, failed gasket, etc.) will cause erratic sensor output and may be incorrectly attributed to a faulty sensor.

• A failing oxygen sensor frequently triggers the MIL without any noticeable drivability change initially. Fuel consumption, however, is still negatively affected. Proactive replacement at the recommended interval can save up to 15% on fuel costs.
• To diagnose a faulty sensor:
  • Heater circuit test: Use a digital multimeter to measure the resistance across the two heater circuit pins. A healthy sensor should read within the expected specification (consult your vehicle‘s service manual). An open circuit (infinite resistance) or short circuit (0 Ω) indicates failure.
  • Sensor signal test: Use an OBD‑II scanner or oscilloscope to monitor the sensor voltage output under steady‑state driving. A healthy narrow‑band upstream sensor fluctuates continuously between approximately 0.1 V – 0.9 V (typically oscillating several times per second). If the voltage remains steady (stuck high, stuck low, or at a fixed mid‑range value), does not fluctuate, or changes very slowly, the sensor is failing.
• P0133 (O₂ Sensor Circuit Slow Response) is a common code for this type of sensor, indicating that the sensor‘s switching speed has fallen below the acceptable threshold.
• P0420 can be caused by a failing downstream oxygen sensor, a failing catalytic converter, or an upstream sensor that is no longer providing accurate readings to the ECU. A single P0420 with no sensor circuit codes and normal fuel trims leans toward a worn catalyst; multiple sensor circuit or heater codes point to an O₂ sensor or wiring problem.
• Always investigate the root cause before replacing the sensor – if contamination (oil, coolant, silicone) caused the failure, replacing the sensor without addressing the underlying issue will result in repeated premature failure.

• This is a direct‑fit upstream sensor with a rectangular 4‑pin 2-female connector, M18 × 1.5 thread, and 425 mm cable length (overall length from nut to connector end: 515 mm).
• Do not purchase based solely on the OE number – aftermarket manufacturers may produce sensors with the same OE reference but with slight differences in cable length, connector shape or calibration parameters. If the connector does not match, do not install.
• Physical inspection of your original sensor is strongly recommended. Compare the connector shape (rectangular), pin count (4), cable length (425 mm) and thread size (M18 × 1.5) before ordering.

• This sensor is designed for the upstream (pre‑catalyst / front) position as a regulating probe (Bank 1, Sensor 1). It should be installed before the catalytic converter.
• Upstream and downstream O₂ sensors are not interchangeable in most vehicles. Replacing an upstream sensor with a downstream unit (or vice versa) will result in improper ECU readings and persistent fault codes.
• For most 4‑cylinder vehicles, there are two oxygen sensors: upstream (pre‑cat / regulating) and downstream (post‑cat / diagnostic). Verify the location of your old sensor before ordering. A clear sign: an upstream sensor is typically near the exhaust manifold; downstream sensors are found further rearward after the converter.

• Lambda sensors degrade gradually over time, often without triggering immediate fault codes. Their switching response becomes slower and their voltage range narrows with age and mileage.
• Replacement every 100,000 – 160,000 km (60,000 – 100,000 miles) is recommended to maintain optimal fuel efficiency, catalytic converter health, proper emissions output and correct OBD‑II monitor readiness.
• Even if no Check Engine Light is present, an aged sensor will still respond more slowly than a new one, negatively affecting fuel economy and emissions. Proactive replacement can save up to 15% on fuel consumption.

Before Installation:

• Allow the exhaust system to cool completely before removal – the exhaust manifold and catalytic converter remain dangerously hot for a significant period after engine shutdown (up to 30 minutes).
• Disconnect the vehicle‘s battery negative (-) cable before starting work to prevent electrical issues, potential ECU damage, or accidental short circuits.
• Use a high‑quality O₂ sensor socket (22 mm / 7/8″) with an offset design to prevent stripping the sensor‘s flats and to provide better access in confined engine bays. A standard deep socket can easily damage the sensor housing or its flats.

Removal of the Old Sensor:

• Apply penetrating oil to the threads of the old sensor the night before removal to ease extraction.
• If the sensor is difficult to remove when cold, it may be easier when the exhaust is warm (run the engine for 1‑2 minutes, then allow it to cool until it is warm but not scalding). Exercise extreme caution to avoid burns – wear heavy‑duty work gloves.
• Do not use excessive force – damage to the exhaust bung threads can result in expensive repairs and potentially require exhaust component replacement or thread repair.
• Disconnect the electrical connector carefully – press the locking tab and pull only the connector housing (never pull directly on the wires). Follow the sensor wires to locate the connector, which is typically secured to a bracket or stud on the engine block.
• Inspect the old sensor‘s connector, cable and tip for signs of contamination (oil, soot, coolant residue), melting or cracking. Note any contamination – this indicates an underlying engine issue that must be addressed before installing the new sensor.

Installation of the New Sensor:

• Do not apply additional anti‑seize compound unless the new sensor‘s threads are completely dry. Many OE‑type sensors are factory‑coated with anti‑seize. Adding extra can contaminate the sensor tip and cause premature failure. If the threads are dry, apply a small amount of sensor‑safe anti‑seize compound to the threads only – never to the sensor tip.
• Do not use silicone sealants anywhere near the exhaust system – silicone vapour will permanently contaminate and destroy the oxygen sensor (this is one of the most common causes of premature failure).
• DO NOT use any spray, grease, fluid or similar products on the oxygen sensor plug connections – this can interfere with signal transmission and cause electrical faults.
• Avoid touching the sensor tip – skin oils contaminate the ceramic sensing element and cause inaccurate readings and premature failure. Always handle the sensor by the hexagon nut or connector body.
• Do not drop the sensor – the ceramic element inside the metal housing is brittle and can crack upon impact, rendering the sensor inoperative even if no external damage is visible.
• Tighten to the correct torque – typical torque for an M18 × 1.5 oxygen sensor is 40 – 50 Nm (30 – 37 ft‑lb) . Use a torque wrench to avoid overtightening.
  • CAUTION: Overtightening can damage threads in the exhaust bung and may crack the sensor housing. Undertightening may cause exhaust leaks and false oxygen readings.
• Route the wiring harness securely using the original clips and routing guides to prevent contact with hot exhaust components (exhaust manifold, catalytic converter, EGR pipes) or moving parts (drive shafts, steering components, cooling fans).
• Do not interchange the oxygen sensor upstream of the catalytic converter with the sensor downstream of the catalytic converter – this will result in implausible fault entries and the ECU may not be able to correctly monitor catalyst efficiency.
• Reconnect the electrical connector fully – an audible click confirms correct engagement. Ensure the locking tab is fully seated.
• Reconnect the vehicle‘s battery after installation is complete.

Post‑Installation:

• Start the engine and allow it to reach normal operating temperature (closed‑loop mode).
• Verify that no exhaust gas leakage exists around the sensor bung (listen for “puffing” sounds or use a soap‑and‑water solution sprayed around the threads – bubbles indicate a leak).
• Use an OBD‑II scanner to clear any existing fault codes.
• Drive the vehicle through a complete drive cycle (typically 10‑20 minutes of mixed driving: stop‑start traffic, steady cruising and moderate acceleration) to allow the ECU to re‑learn adaptation values and complete oxygen sensor and catalyst monitors.
• After the drive cycle, re‑scan for fault codes to confirm that the oxygen sensor monitors have completed and that no new codes have appeared.

• 4‑cylinder petrol engines (Renault, Dacia, LADA, Smart, Land Rover) typically have one upstream sensor (Bank 1, Sensor 1) and one downstream sensor (Bank 1, Sensor 2). This part is for the upstream position.
• For vehicles equipped with only one oxygen sensor (older Euro‑2 emissions vehicles), this upstream sensor is the correct replacement. If both upstream and downstream sensors are faulty, you will need the appropriate part numbers for each position.

• While this is a direct‑fit part, professional installation is strongly advisable if you are not experienced with exhaust system work or if the sensor is located in a difficult‑to‑reach position.
• After replacement, the ECU may need to have adaptation values reset using manufacturer‑specific diagnostic equipment (e.g., Renault CLIP, Land Rover IDS, Mercedes XENTRY, Smart diagnostic tools).
• Improper installation can lead to:
  • Exhaust leaks around the sensor bung
  • Cross‑threaded or damaged exhaust bung threads – expensive to repair
  • Sensor damage from contamination or mishandling
  • Wiring damage from contact with hot exhaust components
  • Persistent ECU fault codes despite a correctly functioning sensor
• If your vehicle has covered more than 100,000 km, it is common practice to replace the oxygen sensor proactively, even without fault codes, to restore fuel efficiency.

• Genuine OE parts from manufacturer dealerships (Renault, Dacia, Smart, Mercedes, Land Rover) typically include a manufacturer warranty through authorised dealers.
• Aftermarket equivalents may offer varying warranty periods – commonly 1 to 2 years, and some premium aftermarket sensors carry extended warranties (e.g., 3‑year / 60,000‑mile coverage, Lifetime Warranty from Intermotor). Check with your specific retailer for their warranty terms and return policy.
• Important: Most warranties are voided if the sensor tip shows contamination from improper handling (e.g., touching the tip, dropping the sensor, silicone exposure, or installation with contaminated hands / tools). Oxygen sensors are often non‑returnable except for approved warranty replacement due to contamination risk. Keep your original packaging until the new sensor is installed and confirmed working.

Disclaimer: While we strive for accuracy, vehicle specifications and OE part numbers may vary by production date, market region and vehicle trim level. The vehicle fitment information provided for this part number is based on available cross‑reference data and is a guide only – not an exhaustive compatibility list. This part number (226A41772R) is a Renault‑Nissan‑Mitsubishi Alliance OE number for a 4‑wire heated upstream (pre‑catalyst) oxygen sensor on a wide range of 4‑cylinder petrol engines. This sensor is not compatible with older pre‑Euro 3 diesel engines (diesel O₂ sensors may use different calibration parameters and part numbers). You should verify physical fitment (rectangular 4‑pin 2-female connector, 425 mm cable length, M18 × 1.5 thread) and confirm the position (upstream / pre‑catalyst / front) of your old sensor before purchasing. If your vehicle is not listed above, or if you are unsure of compatibility, consult your vehicle‘s manufacturer specifications, an authorised dealer or a qualified mechanic before ordering. The information provided is for general informational purposes only and should not be relied upon as professional advice. Always verify compatibility using your vehicle‘s VIN or original part number.