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

Suitable for Downstream O2 Sensor

Name: Suitable for Downstream O2 Sensor for Cadillac Escalade Chevy Silverado GMC Sierra | 12657188 234-4974
SKU: 12657188 /A
Price: 24.95 USD
Availability: InStock

for Cadillac Escalade Chevy Silverado GMC Sierra

🏷️ Replaces OE: 12657188 234-4974

6 left

$24.95

Final: $23.70 -5% OFF

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📦 Free US Shipping (Local Warehouse)
↩️ 30-Day Return, Exchange, and Refund Guarantee
🛡️ 2-Year Warranty (100% Brand New)
🤝 Guaranteed Exact Fit
🔒 Secure Encrypted Payment

✅ Check Fitment Below: If your vehicle matches, place your order directly with confidence!

💼 Mechanic or Auto Repair Shop?

We offer exclusive wholesale pricing and bulk discounts for professional auto repair shops and dealers. We support both online and offline qualification verifications. Partner with us for reliable inventory!

💬 WhatsApp

+86 18316212443

Or apply directly via our Wholesale Purchasing page.

⚙️ Sensor Installation Blueprint

👨‍🔧 Mechanic's Installation Notes:

Location: Screws into the exhaust pipe, immediately AFTER (or directly ON) the Catalytic Converter under the vehicle.
Tools Needed: 7/8" (22mm) O2 Sensor Wrench/Socket & Penetrating Oil.
Error Codes: P0137, P0138, P0420, P0430

Automotive-Leader Sensors

Vehicle Compatible

Year	Make	Model
2015-2018	Cadillac	Escalade
2016-2017	Chevrolet	Express 2500 / 3500
2016	Chevrolet	Express 4500
2014-2018	Chevrolet	Silverado 1500
2016-2018	Chevrolet	Silverado 2500 / 3500
2015-2018	Chevrolet	Suburban
2018	Chevrolet	Suburban 3500 HD
2015-2018	Chevrolet	Tahoe
2016-2017	GMC	Savana 2500 / 3500
2016	GMC	Savana 4500
2014-2018	GMC	Sierra 1500
2016-2018	GMC	Sierra 2500 / 3500
2015-2018	GMC	Yukon
2015-2018	GMC	Yukon XL

Product Specifications

Warranty & Support: 2 Years + 24/7 Technical Support

Item	Specification
Core Part Number	12657188 Interchange: 12661898, 12655678, 12665163, 12643708, 18054, 21075, 234-4974
Position	Exhaust System, Downstream (Post-Catalytic Converter)
Key Parameters	- Type: Heated Oxygen Sensor - Wire Count: 4 Wires - Connector Gender: Male - Connector Shape: Oval - Thread Diameter: 18 mm - Total Length: 410 mm - Mounting Type: Position 2

Package Content : 1Pcs 12657188 Oxygen Sensor

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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

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 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

Suitable for Downstream O2 Sensor

Automotive-Leader Sensors

Vehicle Compatible

Product Specifications

Customer Reviews

Subscribe to our email list to receive a 8% 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

Suitable for Downstream O2 Sensor

🚕 Vehicle Model Verification

Automotive-Leader Sensors

Vehicle Compatible

Product Specifications

Customer Reviews

Subscribe to our email list to receive a 8% 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