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Mazda

Zoom-zoom with confidence. Our premium aftermarket engine parts for Mazda are built to optimize your fuel efficiency and engine throttle response. Whether you need to clear a check engine light or upgrade your ignition system, our Mazda replacement components offer the perfect balance of quality and value for your DIY repair.

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.

China Address

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

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

Mazda

Find Parts by Vehicle

High Pressure Fuel Pump (HPFP) for Mazda 3 6 CX-5 2.0L 2.5L - PE19203F0 PE01203F0B

Fuel Injector for Mazda 3 CX-3 CX-5 MX-5 Miata 2.0L Skyactiv - PE0113250C PE0113250B

Upstream Air Fuel Ratio Sensor for Mazda 6 2.3L (2005) - 234-9086 L362188G1

Downstream O2 Sensor for Mazda 3 2.3L (2007-2013) - L34B18861A, L34B18861B

Upstream O2 Sensor for Ford Escape Fusion Mazda Tribute 2.5L (2010-2013) - 9E5Z9F472E BL3Z9F472D

2Pcs O2 Sensor Upstream & Downstream for Mazda MX-5 Miata 2.0L (16-18) P51B188GX, P51S1886ZA

5-Wire Upstream Air Fuel Ratio Sensor for Mazda 6 2.3L (2002-2007) - LFH1-18-8G1

5-Wire Upstream Air Fuel Ratio Sensor for Mazda CX-7 2.3L (2007-2012) - 234-5012 L33L-18-8G1B

Downstream O2 Sensor for Mazda CX-3 MX-5 & Toyota Yaris iA - 234-8000, 89465WB001

Upstream Air Fuel Ratio Sensor for Mazda 3 2.3L Turbo (Mazdaspeed) - 234-5042 L3CE188G1

2Pcs Air Fuel Ratio & O2 Sensor for Mazda RX-8 1.3L R2 Rotary (2009-2011) | 234-9102 234-4349

Ignition Coil for Ford Edge Fusion Mustang & Mazda CX-9 3.5L 3.7L - UF553 7T4Z-12029-E

Downstream O2 Sensor Bank 1 for Mazda MPV 3.0L V6 (1996-1998) - 234-4142 15257

Upstream Air Fuel Ratio Sensor for Mazda 3 Mazda 5 2.0L 2.3L - 234-5015

2Pcs O2 Sensor Upstream & Downstream for Mazda 6 2.5L (2009-2013) | 250-25090 250-24859

2Pcs Air Fuel Ratio & O2 Sensor for Mazda 3 2.0L 2.3L (2006-2009)| 234-5015 234-4392

Downstream O2 Sensor for Mazda RX-8 1.3L Rotary (2004-2011) - 234-4349

Upstream Air Fuel Ratio Sensor for Mazda CX-7 2.5L Non-Turbo (2010-2012) - 234-5043 L555188G1

Upstream Air Fuel Ratio Sensor for Mazda MX-5 Miata 2.0L (2006-2008) - 234-9088 LFG1188G1A

4Pcs Oxygen Sensor Set for Land Rover Discovery 4.0L 4.6L V8 (1999-2004) | 234-4694 234-4696

2Pcs O2 Sensor Upstream & Downstream for Mazda 3 2.3L (2010-2013) | 234-5042 234-4391

2Pcs Air Fuel Ratio & O2 Sensor for Mazda CX-7 2.3L Turbo (2007-2009) - L33L188G1B FS1H18861A

4Pcs O2 Sensor Set for Mazda CX-9 Ford Edge Lincoln MKX 3.5L (2007-2009) 234-4372 234-4610

Downstream O2 Sensor for Mazda 2 3 6 (2004-2013) - 234-4329 L32F18861A

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

Mazda

Find Parts by Vehicle

High Pressure Fuel Pump (HPFP) for Mazda 3 6 CX-5 2.0L 2.5L - PE19203F0 PE01203F0B

Fuel Injector for Mazda 3 CX-3 CX-5 MX-5 Miata 2.0L Skyactiv - PE0113250C PE0113250B

Upstream Air Fuel Ratio Sensor for Mazda 6 2.3L (2005) - 234-9086 L362188G1

Downstream O2 Sensor for Mazda 3 2.3L (2007-2013) - L34B18861A, L34B18861B

Upstream O2 Sensor for Ford Escape Fusion Mazda Tribute 2.5L (2010-2013) - 9E5Z9F472E BL3Z9F472D

2Pcs O2 Sensor Upstream & Downstream for Mazda MX-5 Miata 2.0L (16-18) P51B188GX, P51S1886ZA

5-Wire Upstream Air Fuel Ratio Sensor for Mazda 6 2.3L (2002-2007) - LFH1-18-8G1

5-Wire Upstream Air Fuel Ratio Sensor for Mazda CX-7 2.3L (2007-2012) - 234-5012 L33L-18-8G1B

Downstream O2 Sensor for Mazda CX-3 MX-5 & Toyota Yaris iA - 234-8000, 89465WB001

Upstream Air Fuel Ratio Sensor for Mazda 3 2.3L Turbo (Mazdaspeed) - 234-5042 L3CE188G1

2Pcs Air Fuel Ratio & O2 Sensor for Mazda RX-8 1.3L R2 Rotary (2009-2011) | 234-9102 234-4349

Ignition Coil for Ford Edge Fusion Mustang & Mazda CX-9 3.5L 3.7L - UF553 7T4Z-12029-E

Downstream O2 Sensor Bank 1 for Mazda MPV 3.0L V6 (1996-1998) - 234-4142 15257

Upstream Air Fuel Ratio Sensor for Mazda 3 Mazda 5 2.0L 2.3L - 234-5015

2Pcs O2 Sensor Upstream & Downstream for Mazda 6 2.5L (2009-2013) | 250-25090 250-24859

2Pcs Air Fuel Ratio & O2 Sensor for Mazda 3 2.0L 2.3L (2006-2009)| 234-5015 234-4392

Downstream O2 Sensor for Mazda RX-8 1.3L Rotary (2004-2011) - 234-4349

Upstream Air Fuel Ratio Sensor for Mazda CX-7 2.5L Non-Turbo (2010-2012) - 234-5043 L555188G1

Upstream Air Fuel Ratio Sensor for Mazda MX-5 Miata 2.0L (2006-2008) - 234-9088 LFG1188G1A

4Pcs Oxygen Sensor Set for Land Rover Discovery 4.0L 4.6L V8 (1999-2004) | 234-4694 234-4696

2Pcs O2 Sensor Upstream & Downstream for Mazda 3 2.3L (2010-2013) | 234-5042 234-4391

2Pcs Air Fuel Ratio & O2 Sensor for Mazda CX-7 2.3L Turbo (2007-2009) - L33L188G1B FS1H18861A

4Pcs O2 Sensor Set for Mazda CX-9 Ford Edge Lincoln MKX 3.5L (2007-2009) 234-4372 234-4610

Downstream O2 Sensor for Mazda 2 3 6 (2004-2013) - 234-4329 L32F18861A

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