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Item #:
16870819
234-9120 Air Fuel Ratio Upstream Oxygen O2 Sensor 1 for Subaru Forester 2004-2010 Impreza 2004-2007 Legacy Outback 2005-2007, for Saab 9-2X 2006 2.5L
Item #:
16870819
MWK 121647
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*All items will import from US
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Direct Fit Application 234-9120 upstream o2 sensor 1 replacement for 2006 2007 Subaru Forester XT 2.5L-H4, for 2006 2007 Subaru Impreza WRX 2.5L-H4, for 2007 Subaru Impreza WRX STI 2.5L-H4
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What Stands Out
Compatibility
Designed specifically for Subaru and Saab models, ensuring seamless integration and optimal performance for vehicles like Forester, Impreza, and 9-2X. Perfect fit guarantees reliability and efficient operation.
Enhanced Performance
Improves fuel efficiency and reduces emissions by accurately measuring the air-fuel mixture, thereby enhancing the vehicle's overall performance and longevity. Essential for meeting environmental standards and proper engine function.
High Quality
Manufactured with robust materials and advanced technology, this O2 sensor promises durability and long-lasting performance. A reliable choice that provides excellent value and peace of mind for vehicle owners.
Product Details
- Direct fit application for Subaru 2006-2007 Forester XT, 2006-2007 Impreza WRX, 2007 Impreza WRX STI Wagon 2.5L-H4.
- High-quality aftermarket oxygen sensor with laser welding and Viton sealing system, meeting OEM standards.
- Reduces CO2 and other harmful emissions, extends the life of the catalytic converter.
- 4-wire upstream/front type with wire length of 910mm.
- Must pass strict professional road test before sale and shipping, backed by 100% satisfaction after-sales service and technical support.
- Compatible with various Subaru models, please ensure the part number and product image match your vehicle before purchase.
| Country of Origin | This item will be imported from US |
| Item Weight | 0.5 lbs (230 grams) |
| What is in the box | 234-9120 Air Fuel Ratio... For more details, please check description/product details |
Dangerous Goods
To avoid the delay in customs clearance process for Dangerous Goods, the shipment shall be opened at our warehouse facility to check the severity of hazardous components. Please see the list of Dangerous goods here.
Who Should Buy?
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Subaru Owners
Ideal for Subaru owners needing a replacement oxygen sensor to maintain optimal engine performance and fuel efficiency.
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DIY Mechanics
Great for DIY mechanics looking to replace defective O2 sensors efficiently without needing professional help.
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Older Vehicle Users
Beneficial for those with older Subaru models that often require sensor replacements to reduce emissions and improve gas mileage.
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Newer Models
Not suitable for newer Subaru models as it's designed specifically for older models only.
Product Description
234-9120 Air Fuel Ratio Upstream Oxygen O2 Sensor 1 for Subaru Forester 2004-2010 Impreza 2004-2007 Legacy Outback 2005-2007, for Saab 9-2X 2006 2.5L H4 22641-AA211 22641-AA490
About This Item
Upgrade your Subaru's performance with the Automotive-leader 234-9120 Air Fuel Ratio Upstream Oxygen O2 Sensor! This high-quality sensor is designed to optimize the air-fuel mixture in your vehicle's engine, resulting in improved fuel efficiency and better overall performance. Engineered to be compatible with Subaru 2006-2007 Forester XT, 2006-2007 Impreza WRX, and 2007 Impreza WRX STIWagon models with a 2.5L-H4 engine, this sensor is a perfect fit for your specific vehicle. The package includes 1 piece of the 234-9120 Subaru upstream oxygen sensor, giving you everything you need to upgrade your Subaru's air-fuel ratio system. This sensor is also compatible with Subaru AFR, ensuring seamless integration with your Subaru's existing components. With the Automotive-leader 234-9120 Air Fuel Ratio Upstream Oxygen O2 Sensor, you can enjoy optimal engine performance and improved fuel economy. Say goodbye to inefficient fuel consumption and hello to a smoother, more powerful driving experience. Upgrade your Subaru today with this reliable and high-performing oxygen sensor.
Don't settle for anything less than the best for your vehicle. Trust the Automotive-leader 234-9120 Air Fuel Ratio Upstream Oxygen O2 Sensor to deliver exceptional performance and reliability. So why wait? Invest in your Subaru's performance and fuel efficiency today with the Automotive-leader 234-9120 Air Fuel Ratio Upstream Oxygen O2 Sensor. Upgrade your Subaru and experience the difference for yourself!.
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Customer Questions & Answers
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Question:
What is the function of the 234-9120 O2 sensor in my vehicle?
Answer: The 234-9120 O2 sensor measures the amount of unburned oxygen in the exhaust gases, communicating this data to the engine control unit (ECU). This feedback is crucial for the ECU to adjust the air-fuel mixture, optimizing combustion and enhancing fuel efficiency. If this sensor fails, it can lead to poor fuel economy and increased emissions. -
Question:
Is the 234-9120 O2 sensor compatible with my Subaru?
Answer: Yes, the 234-9120 O2 sensor is specifically designed for several Subaru models including the Forester (2004-2010), Impreza (2004-2007), Legacy, and Outback (2005-2007). It ensures proper fitment and function, making it a reliable replacement part for these vehicles. -
Question:
How do I know if the O2 sensor needs replacement?
Answer: Signs that your O2 sensor may need replacement include poor fuel efficiency, rough engine performance, and the check engine light illuminating. Additionally, a noticeable increase in emissions may also indicate sensor failure. Addressing these symptoms promptly can prevent further engine issues. -
Question:
Can I install the 234-9120 O2 sensor myself?
Answer: Yes, installing the 234-9120 O2 sensor can be a DIY task for those with basic mechanical skills. Typically, it requires minimal tools and involves locating the existing sensor on your exhaust system and replacing it. Proper installation can help you restore optimal engine function and efficiency. -
Question:
What vehicles is the 234-9120 O2 sensor compatible with?
Answer: The 234-9120 O2 sensor is compatible with a variety of Subaru models from 2004-2010, including the Forester, Impreza, Legacy, and Outback. Additionally, it also fits the Saab 9-2X with a 2.5L engine. This ensures that a wide range of vehicle owners can benefit from a proper and efficient sensor. -
Question:
How does a faulty O2 sensor affect my engine performance?
Answer: A faulty O2 sensor can drastically affect engine performance by sending incorrect signals to the ECU. This can result in poor fuel economy, increased emissions, engine misfires, and even stalling. Replacing a malfunctioning sensor is crucial to maintaining an efficient and reliable engine operation. -
Question:
What should I look for when purchasing an O2 sensor?
Answer: When purchasing an O2 sensor like the 234-9120, consider factors such as compatibility with your vehicle, brand reputation, and warranty offered by the retailer. High-quality sensors will generally offer better performance and longevity, ensuring your engine runs smoothly while meeting emissions standards. -
Question:
What are the benefits of using a high-quality O2 sensor like the 234-9120?
Answer: Using a high-quality O2 sensor such as the 234-9120 ensures accurate readings for optimal air-fuel mixture adjustments. This leads to improved fuel efficiency, reduced engine wear, and lower emissions. Moreover, a reliable sensor can extend the life of other engine components by preventing improper combustion. -
Question:
Where can I buy the 234-9120 Air Fuel Ratio Upstream Oxygen O2 Sensor?
Answer: You can purchase the 234-9120 Air Fuel Ratio Upstream Oxygen O2 Sensor from Ubuy. They offer a wide selection of auto parts including this sensor, ensuring you find the right fit for your Subaru or Saab model, along with options for delivery to your location. -
Question:
What maintenance tips should I follow for my O2 sensor?
Answer: To maintain your O2 sensor, regularly check for exhaust leaks which can affect performance, and consider using high-quality fuel to reduce deposits. Additionally, staying on top of routine vehicle servicing can help catch any early signs of sensor issues. Maintaining your sensor can extend its life and enhance your vehicle's performance.
Automotive-leader Oxygen Editorial Review
The Automotive-leader 234-9120 Air Fuel Ratio Upstream Oxygen O2 Sensor received mixed feedback from customers. Some users reported that the sensor worked well initially but then slowly declined, causing their car to run rich and resulting in dangerous lean conditions under boost. One user suggested that the sensor may not function properly with E85 fuel and recommended opting for OEM replacements instead. Another customer observed that the sensor did not function as it should and advised individuals to always have a way to read their AFR when replacing sensors, particularly in turbocharged Subarus, to potentially prevent damage to the engine. On the other hand, a user mentioned that the part fit as expected and worked like the original one. Another customer praised the replacement part's quality and performance, while a different individual appreciated the easy installation and functionality of the sensor, despite having to make minor adjustments to fit a standard box wrench. Overall, there was dissatisfaction with the product's reliability and function, prompting some users to opt for OEM replacements.
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Pros
- Easy installation
- Quality replacement part
- Fits as expected
Cons
- Declined performance over time
Platform Trust & Buyer Confidence
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Mohammad
Verified buyer
“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
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“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
22-Jul-26 · via Trustpilot
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“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”
22 July 2026 · via Trustpilot
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23 July 2026 · via Trustpilot
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MWK 121647
Order now and get it around Wednesday, August 26
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
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Features & Benefits
- 1Pcs 234-9120 Oxygen Sensor
- Wire Harness Length
- Wire Quantity
- Sensor Type
- Universal Or Specific Fit
- Placement on Vehicle
- Vehicle Compatible
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