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GMC（Oldsmobile, Hummer）

Whether it's a Hummer’s off-road capabilities or a GMC’s hauling power, you need parts that are built to handle the job. Our aftermarket engine components for GMC, Hummer, and Oldsmobile models deliver OEM-level quality and reliability. Fix your engine issues right the first time with our precision-fit replacements.

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FAQ & Support

🚦 1. Trouble Codes & Symptoms

Q1: My car shows codes like P0420 / P0171 / P0138. What do they mean?

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.

Q2: My engine shakes at idle. Is my ignition coil bad?

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.

Q3: What are the symptoms of a bad oxygen sensor?

Typical signs include: Check Engine Light on, Increased fuel consumption, Poor acceleration, Strong fuel smell, and Slow throttle response.

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

🔍 2. Fitment & Compatibility

Q4: How do I know which oxygen sensor fits my car?

Just provide: Year, Make, Model, and Engine size.

We'll confirm: Upstream or downstream, Correct connector, Proper reference number, and Federal vs. California emissions compatibility.

Q5: What's the difference between ignition coils?

High-quality aftermarket: Close to Standard but more affordable.

We only offer high-grade, reliable ignition coils.

Q6: How many oxygen sensors does my car have?

Most vehicles have 2–4 sensors (Upstream front and Downstream rear). We can confirm the exact number for your vehicle.

🛒 3. Buying, Quality & Concerns

Q7: Are cheap oxygen sensors reliable?

They work for a short time but usually cause issues like short lifespan, slow response, and frequent check engine lights.

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

Q8: How can I avoid buying a refurbished or used auto part?

Check for scratches on the connector, dirty wiring, or marks on threads.

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

🧰 4. Installation & Usage

Q9: Can I install an oxygen sensor myself?

Yes. Difficulty: medium.

You'll need an O2 sensor socket, Anti-seize compound, and a Torque wrench. We recommend clearing fault codes with an OBD scanner after installation.

Q10: Do ignition coils need programming after replacement?

In most vehicles, no programming is required. Just swap the old coil with the new one.

💰 5. Value & Performance

Q11: Your parts cost less than Other accessories. Are they really reliable?

Yes—our parts use the same-grade materials and testing standards as suppliers. Because we don't go through dealer channels, the price is much more affordable.

About us

Since its inception, Automotive Leader has been guided by a simple mission: to provide high-performance aftermarket parts for automotive technicians and DIY enthusiasts.

The website is jointly operated by Trademark Name: Automotive-leader Store registered at Physical Address: Room 602, No. 152 Helong East Road, Helong Subdistrict, Baiyun District, Guangzhou City Postal Code: 510000 and Company name：BLUE STAR TRADING LIMITED registered at Company address：RM C，6/F，WORLD TRUST TOWER 50 STANLEY STREET CENTRAL HK

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

whatsAPP Number: +86 18316212443

Email: support@automotive-leaderstore.com

Logistics Policy

1. U.S. Warehouse (Standard Option)
Handling time: 1-3 business days
Transit time (days): 3-6 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.

3.UK Warehouse (Standard Option)

Handling time: 1-3 business days.

Transit time (days): 3-7 business days via Royal Mail/UPS/FedEx/DPD.

4.Canada Warehouse (Standard Option)

Handling time: 1-3 business days.

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

5.German Warehouse (Standard Option)

Handling time: 1-3 business days.

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

Refund and Return Policy

30-Day Returns and Refunds / Return shipping is free（Due to a product issue）

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 been approved, please contact us.

Contact: support@automotive-leaderstore.com

Account

GMC（Oldsmobile, Hummer）

Filters

4Pcs Oxygen Sensor for Chevy Silverado & GMC Sierra 1500/2500 (2003-2006) | 234-4669 234-4407

4Pcs O2 Sensor for Chevy Silverado Tahoe GMC Sierra Escalade (14-18)| 234-4940, 234-4974

4Pcs Oxygen Sensor Set for GMC Yukon & Sierra 1500/2500 (2008-2014) | 234-4256 234-4668

3Pcs O2 Sensor Set for Chevy S10 & Blazer 4.3L (2002-2005) | 234-4343

4Pcs O2 Sensor Set for Chevy Traverse & GMC Acadia 3.6L V6 (2009-2011) | 234-4815 234-4816

2Pcs O2 Sensor for Chevy Silverado Tahoe GMC Sierra | 234-4940 234-4974

2Pcs Downstream O2 Sensor for Cadillac Escalade Chevy Silverado GMC Yukon | 234-4256

4Pcs O2 Sensor Set for Chevy Silverado Trailblazer GMC Sierra Envoy | 234-4668, 234-4651

4Pcs O2 Sensor for Chevy Express GMC Savana 1500 2500 (08-14) | 234-4336 234-4243

Suitable for 2Pcs Upstream Left & Right O2 Sensor for Buick Enclave Chevy Traverse GMC Acadia | 234-4815

Upstream O2 Sensor for Chevy Silverado Tahoe GMC Sierra Yukon (03-10)| 234-4669

2Pcs O2 Sensor Up/Down for Chevy Equinox GMC Terrain 2.4L | 234-4242 234-4530

4Pcs O2 Sensor Set for Chevy Silverado Tahoe & GMC Sierra Yukon | 234-4668

Suitable for Universal Heated O2 Sensor for Chevy Silverado & Tahoe (2003-2005) | 234-4668 12583804

4Pcs O2 Sensor Set for Chevy Silverado & GMC Sierra 1500 (1999-2002) | 234-4012, 234-4018

Downstream O2 Sensor for Chevy Camaro Corvette Silverado Cadillac CTS | 234-8080, 12655677

Upstream O2 Sensor for Chevy Camaro Corvette Silverado Cadillac CTS CT6 | 234-8085

Suitable for Upstream Left Side O2 Sensor for Chevy GMC Cadillac | 15150, 234-4337

Suitable for Fuel Injector for Chevy Terrain GMC Cadillac CTS SRX Buick 3.0L 3.6L | 12629927 12642021

Suitable for Fuel Injector for Chevy Camaro Traverse GMC Acadia Cadillac 3.6L V6 | 12638530 FJ994

8Pcs Fuel Injector Set for Chevy Silverado Tahoe GMC Sierra 4.8L 5.3L 6.0L V8 | 17113553 FJ315

Suitable for Fuel Injector for Chevy Malibu Equinox GMC Terrain Buick 2.4L | FJ1154 12633784

Suitable for 8Pcs Fuel Injector Set for Chevy Silverado Tahoe GMC Sierra V8 | 12613411

2Pcs O2 Sensor for Chevy Blazer Camaro GMC 2.0L 2.5L (2013-2015) | 234-8080 234-8085

Subscribe to our email list to receive a VIP discount

FAQ & Support

🚦 1. Trouble Codes & Symptoms

🔍 2. Fitment & Compatibility

🛒 3. Buying, Quality & Concerns

🧰 4. Installation & Usage

💰 5. Value & Performance

About us

Logistics Policy

Refund and Return Policy

Country/Region

Country/Region

GMC（Oldsmobile, Hummer）

Filters

4Pcs Oxygen Sensor for Chevy Silverado & GMC Sierra 1500/2500 (2003-2006) | 234-4669 234-4407

4Pcs O2 Sensor for Chevy Silverado Tahoe GMC Sierra Escalade (14-18)| 234-4940, 234-4974

4Pcs Oxygen Sensor Set for GMC Yukon & Sierra 1500/2500 (2008-2014) | 234-4256 234-4668

3Pcs O2 Sensor Set for Chevy S10 & Blazer 4.3L (2002-2005) | 234-4343

4Pcs O2 Sensor Set for Chevy Traverse & GMC Acadia 3.6L V6 (2009-2011) | 234-4815 234-4816

2Pcs O2 Sensor for Chevy Silverado Tahoe GMC Sierra | 234-4940 234-4974

2Pcs Downstream O2 Sensor for Cadillac Escalade Chevy Silverado GMC Yukon | 234-4256

4Pcs O2 Sensor Set for Chevy Silverado Trailblazer GMC Sierra Envoy | 234-4668, 234-4651

4Pcs O2 Sensor for Chevy Express GMC Savana 1500 2500 (08-14) | 234-4336 234-4243

Suitable for 2Pcs Upstream Left & Right O2 Sensor for Buick Enclave Chevy Traverse GMC Acadia | 234-4815

Upstream O2 Sensor for Chevy Silverado Tahoe GMC Sierra Yukon (03-10)| 234-4669

2Pcs O2 Sensor Up/Down for Chevy Equinox GMC Terrain 2.4L | 234-4242 234-4530

4Pcs O2 Sensor Set for Chevy Silverado Tahoe & GMC Sierra Yukon | 234-4668

Suitable for Universal Heated O2 Sensor for Chevy Silverado & Tahoe (2003-2005) | 234-4668 12583804

4Pcs O2 Sensor Set for Chevy Silverado & GMC Sierra 1500 (1999-2002) | 234-4012, 234-4018

Downstream O2 Sensor for Chevy Camaro Corvette Silverado Cadillac CTS | 234-8080, 12655677

Upstream O2 Sensor for Chevy Camaro Corvette Silverado Cadillac CTS CT6 | 234-8085

Suitable for Upstream Left Side O2 Sensor for Chevy GMC Cadillac | 15150, 234-4337

Suitable for Fuel Injector for Chevy Terrain GMC Cadillac CTS SRX Buick 3.0L 3.6L | 12629927 12642021

Suitable for Fuel Injector for Chevy Camaro Traverse GMC Acadia Cadillac 3.6L V6 | 12638530 FJ994

8Pcs Fuel Injector Set for Chevy Silverado Tahoe GMC Sierra 4.8L 5.3L 6.0L V8 | 17113553 FJ315

Suitable for Fuel Injector for Chevy Malibu Equinox GMC Terrain Buick 2.4L | FJ1154 12633784

Suitable for 8Pcs Fuel Injector Set for Chevy Silverado Tahoe GMC Sierra V8 | 12613411

2Pcs O2 Sensor for Chevy Blazer Camaro GMC 2.0L 2.5L (2013-2015) | 234-8080 234-8085

Subscribe to our email list to receive a VIP discount

FAQ & Support

🚦 1. Trouble Codes & Symptoms

🔍 2. Fitment & Compatibility

🛒 3. Buying, Quality & Concerns

🧰 4. Installation & Usage

💰 5. Value & Performance

About us

Logistics Policy

Refund and Return Policy