# Oxygen Sensor
Suitable mainly for gasoline vehicles. Sensors are divided into upstream and downstream types, commonly available as sets: 1 upstream + 1 downstream or 2 upstream + 2 downstream.

Function: The upstream sensor monitors fuel injection frequency, while the downstream sensor checks whether the catalytic converter works properly.
Material: Stainless steel housing + plastic connector.
Before ordering, please confirm the required quantity, mounting position (upstream / downstream), connector shape, pin count and wire length for your vehicle.

Reference Part Numbers:
234-9148, 234-4985

Compatible Vehicles:
For INFINITI QX60 2015-2019
For NISSAN ALTIMA 2015-2018
For NISSAN MAXIMA 2016-2020
For NISSAN MURANO 2015-2020
For NISSAN PATHFINDER 2015-2019
For NISSAN QUEST 2015-2017
For NISSAN ROGUE 2017-2019

Application:
Installed on the exhaust system of gasoline vehicles to measure oxygen content in exhaust gas and send feedback to the ECU. The upstream sensor adjusts fuel quantity, and the downstream sensor monitors catalytic converter efficiency to maintain the optimal air-fuel ratio. This item is a replacement part for aged or failed oxygen sensors, to fix issues such as higher fuel consumption, excessive emissions and illuminated warning lights.

Key Features:
1. Upstream (Front) Sensor: Measures exhaust oxygen level and sends signals to ECU to adjust fuel injection and air-fuel ratio.
2. Downstream (Rear) Sensor: Evaluates conversion efficiency of the catalytic converter and monitors emission standards.
3. Ceramic Heating Element: Heats up quickly during cold start to enter closed-loop control within seconds and reduce cold-start emissions.
4. Stable Signal Transmission: High-quality chip processes signals with platinum electrodes for reliable feedback for ECU fuel adjustment.
5. Premium Construction: Stainless steel shield, precision threads, stainless steel nut and plastic connector, high temperature resistant and anti-corrosion.
6. Direct Replacement Design: No modification, cutting or extra wiring required, plug-and-play.

Highlights:
✅ Convenient Kit Option: Available as 1-upstream+1-downstream or 2-upstream+2-downstream sets, better value and easier than buying sensors separately.
✅ Precise Fit: Matches listed part numbers and vehicle specifications with 1:1 dimension to reduce return risk from wrong purchases.
✅ Plug and Play: Connector shape, pin count and wire length match the original, no rewiring needed for simple installation.
✅ Durable Build: Stainless steel housing, platinum electrodes and premium chip deliver stable signals with high heat and corrosion resistance.
✅ Fast Heating Performance: Ceramic heating element enables fast closed-loop activation to improve fuel economy and emissions.
✅ Wide Temperature Range & Long Service Life: Operating range from -40°C to +900°C, designed for service life over 100,000 miles, better than ordinary sensors.

Important Notes:
1. Please check both the reference part number and vehicle year to confirm compatibility before purchase.
2. Distinguish upstream and downstream sensors and avoid reverse installation; upstream controls fuel injection and downstream monitors catalytic converter.
3. Kit quantity includes upstream plus downstream sensors, common configurations are 1 front +1 rear or 2 front +2 rear.
4. Compare connector shape, pin count and wire length before installation. Do not install if they do not match.
5. Professional installation is recommended. Clear trouble codes and complete a drive cycle test after fitting.
6. This is a heated oxygen sensor, designed for gasoline vehicles.

(1) We offer 30 days return policy. Please contact us within 30 days t from the date you receive your order if you have any issues with the product or want return .Refund will be send after we got your resend package.
(2) All returned items should be in the original packaging , return tracking information should be provided.
(3) Buyer is responsible for return shipping cost due to the problem not caused by item quality itself.
(4) Items to be returned must be in resalable condition, for example: Item do not fit your vehicle perfect The item arrived be broken Parcel Lost If you have problems with the above issue, please Contact Us immediately.
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