Important: Verify connector shape and pins match your original part.

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Downstream O2 Sensor

Name: Suitable for Downstream O2 Sensor for Chevy Silverado Express C1500 K1500 GMC Sierra | 234-4018
SKU: 234-4018 /A
Price: 26.95 USD
Availability: InStock

Fits Chevy Silverado Express C1500 K1500 GMC Sierra

Replaces OE: 234-4018

Resolves Symptoms

Check Engine Light (P0420/P0171)
Rough Idle & Hesitation
Poor Fuel Economy (MPG)
Failed Emissions Inspection

Estimated Delivery Free

Ordered

Oct 29

Prepared

Oct 29-Oct 30

Delivered

Nov 12-Nov 20

Requires overseas shipment. Upgrade to expedited shipping at checkout if urgent.

2-Year Warranty

🛡️ Quality Coverage: Protects against any manufacturing defects for 2 full years.

🔄 Free Replacement: Brand-new replacement for free if quality issues occur.

30-Day Return & Refund

📦 Free Returns: Zero costs to you if the product has quality issues.

💰 Full Refunds: 100% money-back guarantee within 30 days for defective items.

5-Step Fitment Guide

Check OE: Find original part no. & plug.
Compare Photos: Match plug with our images.
Verify YMM: Confirm via fitment tool.
Review Specs: Check pins & dimensions.
Purchase: Buy confidently once matched!

Review Rewards

Share an install photo & review to unlock:

Under $50 Orders: 3% Off Next Order
$50+ Orders: 5% Direct Cashback

*Email screenshot of your review to support to claim.

Check if your car is compatible This helps guarantee fitment of parts.

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$26.95

No hidden fees: What you see is what you pay.
Restore performance: Fix issues and drive with confidence.

Check Engine Light? Find Your Symptoms

🌬️ O2 & A/F Sensors

P0134No Activity Detected
P0135Heater Circuit Malfunction
P0137/38Circuit Low/High Voltage
P2195Signal Stuck Lean
P0030/31Heater Control Circuit

⛽ Fuel & Air Mixture

P0171/74System Too Lean
P0172System Too Rich
P2096Post-Catalyst Trim Too Lean
P0087Fuel Rail Pressure Low
P0201-04Injector Circuit Open

♻️ Catalytic Converters

P0420Efficiency Below Threshold (B1)
P0430Efficiency Below Threshold (B2)

⚡ Ignition / Misfires

P0300Random Misfire
P0301-06Cylinder-Specific Misfire

Automotive-Leader Sensors

Vehicle Compatible

Year	Make	Model
1997-2000	Buick	CENTURY
1997-2003	Buick	LESABRE
1997-2003	Buick	PARK AVENUE
1997-2003	Buick	REGAL
1997-1999	Buick	RIVIERA
1997-1998	Buick	SKYLARK
1996-1999	Cadillac	DEVILLE
1996-2000	Cadillac	ELDORADO
1999-2002	Cadillac	ESCALADE
1996-2000	Cadillac	SEVILLE
1996	GMC	G3500
1996-1999	GMC	C1500 PICKUP
1996-1999	GMC	C1500 / C2500 SUBURBAN
1996-2000	GMC	C2500 / C3500 / K2500 PICKUP
1996-1999	GMC	K1500 PICKUP / SUBURBAN
1996-1999	GMC	K2500 SUBURBAN
1996-2000	GMC	K3500
1996-1999	GMC	P3500
1996-1997	GMC	SAFARI
1996-2002	GMC	SAVANA 1500 / 2500 / 3500
1999-2002	GMC	SIERRA 1500
1999-2001	GMC	SIERRA 2500
2001	GMC	SIERRA 3500
1996-2002	GMC	YUKON
2000-2002	GMC	YUKON XL 1500
2000-2001	GMC	YUKON XL 2500
1996-1997	Chevrolet	ASTRO
2002	Chevrolet	AVALANCHE 1500
1996-1999	Chevrolet	C1500 / C2500 PICKUP
1996-1999	Chevrolet	C1500 / K2500 SUBURBAN
1996-2000	Chevrolet	C2500 / C3500 PICKUP
1997-2002	Chevrolet	CAMARO
1996-2002	Chevrolet	EXPRESS 1500 / 2500 / 3500
1996	Chevrolet	G30
2000-2003	Chevrolet	IMPALA
1996-1999	Chevrolet	K1500 PICKUP / SUBURBAN
1996-2000	Chevrolet	K2500 / K3500 PICKUP
1997-2001	Chevrolet	LUMINA
1997-2000	Chevrolet	MALIBU
1997-2003	Chevrolet	MONTE CARLO
1996-1999	Chevrolet	P30
1999-2002	Chevrolet	SILVERADO 1500
1999-2001	Chevrolet	SILVERADO 2500
2001	Chevrolet	SILVERADO 3500
2000-2002	Chevrolet	SUBURBAN 1500
2000-2001	Chevrolet	SUBURBAN 2500
1996-2002	Chevrolet	TAHOE
1997-2000	Chevrolet	VENTURE

Product Specifications

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

Item	Specification
Core Part Number	234-4018 Interchange: 2344018, 234 4018, 19178116, 19178935, 19178945, 19178958, 25161128, 25163080, 25164488, 25178022, 25312194, 25312201, 25312203, 25312211, 25315373
Position	Exhaust System, Downstream (Rear, Post-Catalytic Converter)
Key Parameters	- Type: Heated Oxygen Sensor - Wire Configuration: 4-Wire - Connector Gender: Female - Wire Harness Length: 15.35 IN - Thread Diameter: 0.708 IN - Mounting Type: Threaded

Package Content :

1Pcs 234-4018 Oxygen Sensor

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

Downstream O2 Sensor

🛠️ 1. Tools & Prep

📍 2. Locate & Remove

⚙️ 3. Install New

💻 4. Clear Codes

⚠️ 1. Relieve Pressure

⚙️ 2. Remove & Install

🔍 3. Check Leaks

📍 1. Locate & Remove

⚙️ 2. Install New

💻 3. Clear Codes

Automotive-Leader Sensors

Vehicle Compatible

Product Specifications

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

Downstream O2 Sensor

🛠️ 1. Tools & Prep

📍 2. Locate & Remove

⚙️ 3. Install New

💻 4. Clear Codes

⚠️ 1. Relieve Pressure

⚙️ 2. Remove & Install

🔍 3. Check Leaks

📍 1. Locate & Remove

⚙️ 2. Install New

💻 3. Clear Codes

Automotive-Leader Sensors

Vehicle Compatible

Product Specifications

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