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Downstream Oxygen Sensor for Automobiles

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Frequently asked questions

This store implements a 30-day return and exchange policy.

Our goal is for every customer to be completely satisfied with their purchase. If you have any concerns, please let us know at any time. We will do our utmost to resolve the issue together with you.

Orders may arrive as soon as the same day, or within three days at the latest.

We will ship your order promptly. Once dispatched, you will receive an email with detailed tracking information. Delivery times vary depending on your location.

Our products are manufactured both locally and globally. We carefully select our manufacturing partners to ensure our products are high quality and a fair value.

Shipping is calculated based on your location and the items in your order. You will always know the shipping price before you purchase.

🚦 1. Trouble Codes & Symptoms

These are common codes related to the fuel system or oxygen sensors:

P0420: Catalyst efficiency below threshold
P0171: System too lean
P0138: O2 sensor voltage high

They often indicate a worn oxygen sensor, exhaust leak, or ignition issue.

If you’re not sure, simply tell us your year, make, model, and engine—we’ll check the exact part you need.

It’s very possible. Common symptoms of a failing ignition coil include:

Rough idle or shaking
Hard cold starts
Poor acceleration
Higher fuel consumption
Misfire popping noise

Tell us your vehicle info—our team can help you identify the cause.

Typical signs include:

Check Engine Light on
Increased fuel consumption
Poor acceleration
Strong fuel smell
Slow throttle response

Most sensors should be replaced every 80,000–100,000 km.

🔍 2. Fitment & Compatibility

Just provide:

Year
Make
Model
Engine size

We’ll confirm:

Upstream or downstream
Correct connector
Proper OEM reference number
Federal vs. California emissions compatibility

OEM: Same quality as the factory part; long-lasting
High-quality aftermarket: Close to OEM but more affordable
Cheap low-end coils (we don’t sell these): Short lifespan, unstable performance

We only offer high-grade, reliable ignition coils.

Most vehicles have 2–4 sensors:

Upstream (front): Controls air–fuel ratio
Downstream (rear): Monitors catalytic converter performance

We can confirm the exact number for your vehicle.

🛒 3. Buying, Quality & Concerns

They work for a short time but usually cause issues:

Short lifespan
Slow response
Higher fuel consumption
Frequent check engine lights

We only sell new, high-quality, fully tested sensors.

Check whether the part has:

Scratches on the connector
Dirty or worn wiring
Yellowed insulation
Marks on the threads

Our parts are 100% brand new, never refurbished, and fully tested.

Yes.

30-day returns (unused condition)
Warranty replacement for any defects

We make returns simple and hassle-free.

🧰 4. Installation & Usage

Yes. Difficulty: medium.

You’ll need:

O2 sensor socket
Anti-seize compound
Torque wrench

We recommend clearing fault codes with an OBD scanner after installation.

In most vehicles, no programming is required.

Just swap the old coil with the new one.

Yes, temporarily.

The ECU needs a few miles to adjust new injector values.

It should stabilize after driving a short distance.

💰 5. Value & Performance

Yes—our parts use the same-grade materials and testing standards as OEM suppliers, including:

High-quality heating elements
Durable housings
Precise signal response

Because we don’t go through dealer channels, the price is much more affordable.

A new sensor should have:

Clean, unused threads
Scratch-free connector
Soft, flexible wire
No marks or discoloration

All our products are guaranteed brand new and fully tested.

About us

Automotive Leader started with a simple mission: to provide mechanics and DIYers with OEM-grade parts at affordable prices...

Phone Number: +8615812449181

Email: support@automotive-leaderstore.com

Physical Address: Room 602, No. 152 Helong East Road, Helong Subdistrict, Baiyun District, Guangzhou City Postal Code: 510000

U.S. Warehouse：7600 LTC Parkway 34986 - PORT SAINT LUCIE, FL - United States

Logistics Policy

1.U.S.Warehouse (Standard Option)

Handling time: 1-3 business days

Transit time (days): 3-7 business days via USPS/UPS/FedEx.

2.China Warehouse (Standard Option)

Handling time: 1-3 business days

Transit time (days): 14-22 business days via USPS/UPS/FedEx.

Refund and Return Policy

30-Day Return Policy / Return shipping is free

We do not accept direct exchanges

After receiving and inspecting your returned item, we will notify you whether your refund has been approved

If approved, the refund will be processed back to your original payment method within 5 business days

Please note that your bank or credit card company may also require additional time to process and reflect the refund

If you have not received your refund within 10 business days after your return request has beenapproved

Contact：support@automotive-leaderstore.com

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