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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.

Find Parts by Vehicle

Year

Make

Model

Part Number (Optional)

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 OEM reference number, and Federal vs. California emissions compatibility.

Q5: What's the difference between OEM and aftermarket ignition coils?

OEM: Same quality as the factory part; long-lasting.
High-quality aftermarket: Close to OEM 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 OEM. Are they really reliable?

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

About us

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

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

Phone Number: +86 15812449181

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.

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 been approved, please contact us.

Contact: support@automotive-leaderstore.com

Account

GMC（Oldsmobile, Hummer）

Find Parts by Vehicle

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

4Pcs Oxygen Sensor Set for GMC Yukon & Sierra 1500/2500 (08-14) | 234-4256 234-4668

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

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

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

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

Fuel Injector for Chevy Camaro GMC Canyon Cadillac CTS SRX 3.6L V6 - 12634126 FJ1157

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

4Pcs O2 Sensor Set for Chevy Silverado Tahoe GMC Sierra Escalade (2014-2018) 12657188 12659516

2Pcs O2 Sensor Upstream & Downstream for Chevy Silverado Tahoe GMC Sierra 12659516 12657188

2Pcs O2 Sensor Upstream & Downstream for Chevy Blazer Camaro GMC 2.0L 2.5L 234-8080 234-8085

2Pcs O2 Sensor Up & Down for Chevy Colorado GMC Canyon Hummer H3 234-4294 234-4331

4Pcs O2 Sensor for Chevy Express GMC Savana 1500 2500 (2008-2014) | 234-4336 234-4243

2Pcs O2 Sensor Upstream & Downstream for Chevy Malibu Camaro Impala 2.5L (2013-2016) 234-4763 234-4762

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 (2003-2010) 234-4669/15282

Downstream O2 Sensor for Chevy Colorado GMC Canyon Trailblazer Hummer H3 234-4243 12612571

Downstream O2 Sensor for Chevy Silverado Malibu Cadillac DeVille - 234-4651

Upstream O2 Sensor for Chevy Camaro Impala Malibu 2.5L (2013-2018) - 234-4763 12627139

2Pcs O2 Sensor Upstream & Downstream for Chevy Equinox GMC Terrain 2.4L 234-4242 234-4530

Upstream O2 Sensor for Cadillac DTS Buick Lucerne 4.6L V8 (2006-2011) - 12597990 234-4339

Downstream O2 Sensor for Cadillac Escalade Chevy Silverado GMC Sierra - 12657188 234-4974

Downstream Oxygen Sensor for Chevy Equinox Captiva Sport GMC Terrain (2011-2017) | 234-4530

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）

Find Parts by Vehicle

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

4Pcs Oxygen Sensor Set for GMC Yukon & Sierra 1500/2500 (08-14) | 234-4256 234-4668

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

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

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

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

Fuel Injector for Chevy Camaro GMC Canyon Cadillac CTS SRX 3.6L V6 - 12634126 FJ1157

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

4Pcs O2 Sensor Set for Chevy Silverado Tahoe GMC Sierra Escalade (2014-2018) 12657188 12659516

2Pcs O2 Sensor Upstream & Downstream for Chevy Silverado Tahoe GMC Sierra 12659516 12657188

2Pcs O2 Sensor Upstream & Downstream for Chevy Blazer Camaro GMC 2.0L 2.5L 234-8080 234-8085

2Pcs O2 Sensor Up & Down for Chevy Colorado GMC Canyon Hummer H3 234-4294 234-4331

4Pcs O2 Sensor for Chevy Express GMC Savana 1500 2500 (2008-2014) | 234-4336 234-4243

2Pcs O2 Sensor Upstream & Downstream for Chevy Malibu Camaro Impala 2.5L (2013-2016) 234-4763 234-4762

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 (2003-2010) 234-4669/15282

Downstream O2 Sensor for Chevy Colorado GMC Canyon Trailblazer Hummer H3 234-4243 12612571

Downstream O2 Sensor for Chevy Silverado Malibu Cadillac DeVille - 234-4651

Upstream O2 Sensor for Chevy Camaro Impala Malibu 2.5L (2013-2018) - 234-4763 12627139

2Pcs O2 Sensor Upstream & Downstream for Chevy Equinox GMC Terrain 2.4L 234-4242 234-4530

Upstream O2 Sensor for Cadillac DTS Buick Lucerne 4.6L V8 (2006-2011) - 12597990 234-4339

Downstream O2 Sensor for Cadillac Escalade Chevy Silverado GMC Sierra - 12657188 234-4974

Downstream Oxygen Sensor for Chevy Equinox Captiva Sport GMC Terrain (2011-2017) | 234-4530

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