2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor
2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor is a direct-fit replacement pair priced at $45.88. Designed for precise air-fuel monitoring, it helps restore fuel efficiency and reduce emissions in 1999–2003 RX300 and 2001–2003 Highlander models.
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Key features
- Exact fit for 1999-2003 Lexus RX300 3.0L
- Includes upstream and downstream sensors
- Plug-and-play electrical connectors
- Restores fuel efficiency and reduces emissions
- Compatible with 2001-2003 Toyota Highlander 3.0L
- Durable high-temperature construction
- DIY-friendly installation with basic tools
Pros
- +Affordable at $45.88 for a 2-pack
- +Direct fit eliminates wiring issues
- +Improves fuel economy and engine performance
- +Helps pass emissions testing
- +Saves cost vs dealership OEM parts
Cons
- −Not for vehicles outside listed years/models
- −May require socket tool for tight spaces
About 2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor
What is 2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor?
The 2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor is a set of two OEM-spec oxygen sensors engineered to monitor the air-fuel mixture in 1999–2003 Lexus RX300 and 2001–2003 Toyota Highlander 3.0L V6 engines. These sensors install in the exhaust system—upstream before the catalytic converter and downstream after it—to provide real-time feedback to the engine control unit (ECU), ensuring optimal combustion, reduced emissions, and improved fuel economy. When failing O2 sensors trigger a check engine light or cause poor performance, this set offers a cost-effective, direct solution.
Key features
- Exact Fit — Matches factory specifications for 1999–2003 Lexus RX300 and 2001–2003 Toyota Highlander 3.0L models.
- Dual-Sensor Set — Includes both upstream and downstream sensors for complete system replacement.
- Improved Fuel Efficiency — Accurate air-fuel ratio monitoring helps restore MPG.
- Emissions Compliance — Supports proper catalytic converter function and reduces harmful exhaust output.
- Plug-and-Play Wiring — Connector-matched design simplifies installation without splicing.
- Durable Construction — Built to withstand high-temperature exhaust environments.
- Easy Replacement — Designed for DIY installation with standard tools.
Who is 2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor for?
This sensor set is ideal for RX300 and Highlander owners experiencing check engine lights, reduced fuel economy, or failed emissions tests. It’s suited for DIY mechanics with basic automotive experience who want to maintain engine performance and avoid costly dealership repairs. It's also a smart preventive upgrade for high-mileage vehicles.
How does 2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor compare?
Compared to standard universal oxygen sensors that require wiring modifications, this set offers factory-style connectors and positioning for hassle-free installation. It delivers better reliability than low-cost aftermarket sensors while being more affordable than OEM units from dealerships. It matches the performance of original equipment without the premium price, making it a balanced choice for dependable emissions and fuel economy control.
Best use cases
- →Replacing failed O2 sensors with check engine light
- →Improving fuel economy in high-mileage RX300
- →Preventing catalytic converter damage
- →Passing state emissions inspections
- →DIY maintenance on Toyota/Lexus V6 SUVs
Is 2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor right for you?
This oxygen sensor set is best for owners of 1999–2003 Lexus RX300 or 2001–2003 Toyota Highlander 3.0L models facing O2 sensor failure. Ideal for DIYers with basic tools and moderate mechanical skill. If your check engine light is on or fuel economy drops, this set offers a reliable, affordable fix. Consider OEM sensors if you prefer dealer-grade parts, or universal sensors only if you can modify wiring.
How it compares: Compared to universal oxygen sensors, this set offers plug-and-play installation with no wiring hacks. It outperforms budget sensors in reliability and matches OEM fit, while costing significantly less than dealership replacements for the same application.
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What does an air fuel ratio oxygen sensor do?
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It measures oxygen levels in exhaust gases to help the engine control unit adjust the air-fuel mixture for optimal combustion, improving fuel economy and reducing emissions in your RX300 or Highlander.
Does this oxygen sensor fit 2001 Toyota Highlander?
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Yes, this set fits 2001–2003 Toyota Highlander 3.0L models, including both upstream and downstream sensor positions for complete replacement and proper emissions system function.
How do I know if my O2 sensor is failing?
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Signs include a check engine light, reduced fuel economy, rough idling, failed emissions tests, or catalytic converter issues. This set helps resolve those problems with accurate sensor replacement.
Is this a direct replacement for OEM sensors?
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Yes, these sensors are designed as direct replacements with matching connectors and thread size, ensuring seamless installation without modifications on 1999–2003 RX300 and 2001–2003 Highlander models.
Can I install these oxygen sensors myself?
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Yes, with basic tools and moderate DIY experience, you can replace both sensors. Just disconnect the battery, unplug old sensors, remove with a socket, and install the new ones carefully.
How much does 2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor cost?
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2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor is $45.88 at Lab Work Auto. Prices may change — click through to Lab Work Auto for the latest.
Is 2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor in stock at Lab Work Auto?
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Yes, 2pcs for 99-03 Lexus RX300 3.0L Upstream Downstream Air Fuel Ratio Oxygen Sensor is currently in stock at Lab Work Auto.
Specifications
- SKU
- F8-018240