Upstream Oxygen Sensor
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- Mfg Part #
- 030906265K
- ECS Part #
- ES#4900528
- Brand
-
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Product Details
We Price Match - Give Us A Call or Chat!
Your vehicle's oxygen sensor (frequently referred to as a Lambda probe) is a critical component of the engine management system. Threaded directly into the exhaust pipe, this sensor constantly measures the proportion of unburned oxygen in your exhaust gases. It relays this real-time data back to the Engine Control Unit (ECU), allowing the computer to continuously adjust the air-fuel ratio for optimal and efficient combustion.
Over tens of thousands of miles, the delicate internal ceramic element of the oxygen sensor is subjected to extreme exhaust temperatures, heavy carbon buildup, and chemical contamination. When an O2 sensor degrades and becomes sluggish—or fails completely—the ECU typically defaults to a "rich" fuel map to protect the engine from running too lean. Symptoms of a failing oxygen sensor include a severe drop in fuel economy, a distinct rotten egg or raw fuel smell from the tailpipe, rough or surging idling, engine hesitation under acceleration, and a Check Engine Light.
Don't let a fouled oxygen sensor ruin your gas mileage or cause you to fail a local emissions inspection. This replacement sensor from Bosch (the original inventor and premier OEM supplier of automotive oxygen sensors) is manufactured to exact factory specifications. Replacing an old, lazy sensor will restore crisp engine performance, improve your fuel efficiency, and ensure your classic VW is running cleanly.
Features:
Direct-fit replacement for OE part number 030906265K (also replaces 030906265AA, 030906265AB, and 037906265B)
Restores accurate exhaust gas monitoring to your ECU
Maximizes fuel economy and cures rich-running conditions
Eliminates rough idling, hesitation, and O2-related Check Engine Lights
Features factory-correct wiring harness and connector for true plug-and-play installation
- 030 906 265 K
- 037 906 265 C
- 030 906 265 P
- 030 906 265 AA
- 114 803 0024
This Part Fits the Following Vehicles
| Make | Model | Submodel | Engine | Special Fitment Notes |
|---|---|---|---|---|
| Volkswagen | Golf II | All | 16v | Use vehicle selector to confirm fitment |
| Volkswagen | Golf III | All | 2.0 | Use vehicle selector to confirm fitment |
| Volkswagen | Jetta II | All | 16v | Use vehicle selector to confirm fitment |
| Volkswagen | Jetta III | All | 2.0 | Use vehicle selector to confirm fitment |
| Volkswagen | Passat B3 | All | 16v | Use vehicle selector to confirm fitment |
| Volkswagen | Passat B4 | All | 2.0 | Use vehicle selector to confirm fitment |
This Product Is Covered By Our Lifetime Replacement Program
Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.
If you have any questions, would like to learn more or are ready to place a replacement claim, click here!
Return and Exchanges
Need to set up a return? Click here to begin: Return Process
All you need is your order number and email address.
New/Unused Product Returns
ECS Tuning will accept returns for unused products within 90 days of the ship date for a refund to the original payment method used. The customer is responsible for the return shipping costs and fees. If selecting to use a prepaid shipping label, the shipping cost will be deducted from the total refunded amount. All new/unused products must be new, unused and must be in the original packaging, including labeling, manuals, hardware, etc. Special order parts are non-refundable.
In the event that we find an error on our website or on behalf of an ECS Tuning Representative, we will provide a return shipping label from the original delivery location.
Refused Packages
Any domestic orders that are returned to ECS Tuning as refused by receiver or non-deliverable will be subject to a return handling fee and will be processed as a return in compliance with our standard return policy, including a 15% restocking fee.
Any international orders that are refused at the time of delivery will be subject to carrier abandonment of the package, at which time the ordered products would be discarded by the carrier. The customer will not be refunded for the value of the order and the discarded products are no longer retrievable.
Return Process
ECS Tuning now offers an online returns solution! To get started, simply log into your ECS Tuning account, Click the "View Orders" button on the My Account home page and select the order that you wish to make a return on to begin. If you have any questions, feel free to reach out to our Customer Service Team for assistance!
Please note: Refunds will be processed to the original payment method used on the order or to an in store credit, respective to the type of return that is made as well as any pre-existing arrangements with an ECS Tuning Customer Service Representative. In the event that multiple forms of payment were used, we will refund the value to an in store credit. In the event that a return label is provided, these charges may be deducted from the total refund you receive.
Original shipping costs are non-refundable and the buyer is responsible for return shipping charges. ECS Tuning will not accept COD deliveries.
All in store credit balances will expire after one year from the original purchase date.
Shipping Policy
Free Shipping On Orders $49 & Up
Items marked with a 'Free Shipping On Orders $49 and Up' logo may qualify for free standard economy ground shipping to the contiguous United States (48 states) for most orders with a value greater or equal to $49.00 USD. Oversized products and direct ship products are excluded from this offer unless otherwise noted.
Free Shipping
Items marked as 'Free Shipping' may qualify for free standard economy ground shipping to the contiguous United States (48 states). Oversized products and direct ship products are excluded from this offer unless otherwise noted.
The policies listed above are subject to change at any time without notice.
Lifetime Replacement
Want to know more about our Lifetime Replacement program?
Click here to learn more.
Why You Should Shop From ECS Tuning
ECS Tuning stands out as more than an automotive parts supplier-it's a vibrant community fueled by a shared passion for cars. Born from the enthusiasm of car lovers, we offer an unmatched understanding and commitment to the automotive world, providing high-quality parts and accessories sourced from our own experiences. Our selection is meticulously crafted to meet the highest standards of performance, quality, and design, catering to both the latest trends and classic styles.
Our distinct advantage lies in our passionate team and comprehensive support, offering expert advice and seamless service from selection to installation. Shopping with ECS brings exclusive perks, including our Lifetime Replacement Guarantee and free shipping on orders over $49, enhancing the value of every purchase. As a central hub for car enthusiasts, ECS Tuning fosters a rich community where ideas and experiences flourish, transforming us from a mere supplier into a platform where automotive dreams come to life.
Cancellation Policy
At ECS Tuning, we understand that plans can change. That's why we offer a flexible cancellation policy for our customers. You may cancel your order at any time before you receive the shipment confirmation. This policy is designed to provide you with peace of mind and the flexibility to make adjustments to your purchases as needed. Should you decide to cancel your order, simply reach out to our customer service team, and we will assist you with the process swiftly and efficiently.
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