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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.

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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.

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

Mazda

Filters

2Pcs Air Fuel Ratio & O2 Sensor for Mazda 2 1.5L (2011-2013) | 234-9103 234-4329

Suitable for 5-Wire Upstream Air Fuel Ratio Sensor for Mazda CX-7 2.3L (07-12) | 234-5012 L33L188G1B

Suitable for 2Pcs O2 Sensor Upstream & Downstream for Mazda 6 2.5L (2009-2013) | 234-5033 234-4279

Suitable for 2Pcs Air Fuel Ratio Sensor for Mazda CX-7 2.3L Turbo (07-09) | 234-5012 234-4044

4Pcs O2 Sensor Set for Ford Edge & Mazda CX-9 3.5L 3.7L (2007-2009) | 234-4372 234-4610

Suitable for 2Pcs Oxygen Sensor for Mazda 3 Mazda 5 2.0L 2.3L (04-07) | 234-4390 234-4396

Downstream O2 Sensor for Mazda CX-5 CX-9 2.0L 2.5L (2013-2024) | 234-4583, 250-241074

2Pcs Air Fuel Ratio & O2 Sensor for Mazda CX-3 Toyota Yaris iA 1.5L 2.0L (2016-2018) | 234-5722 234-8000

Upstream Air Fuel Ratio Sensor for Mazda CX-3 Toyota Yaris iA Scion iA (2016-2018) | 234-5722, 89467WB001

2Pcs Air Fuel Ratio & O2 Sensor for Mazda 3 2.0L 2.3L Turbo 2.5L (2010) | 234-5041 234-4467

2Pcs Air Fuel Ratio & O2 Sensor for Mazda 6 2.5L & 2.5L Turbo (2018-2021) | 234-5733 234-4939

Upstream Air Fuel Ratio Sensor for Mazda 6 CX-5 CX-9 2.5L (2016-2024) | 234-5733

2Pcs Air Fuel Ratio & O2 Sensor for Mazda MX-5 Miata 2.0L (2006-2008) | 234-9088 234-4340

2Pcs Air Fuel Ratio & O2 Sensor for Mazda 3 2.0L (2010-2013) | 234-5015 234-4467

Upstream 5-Wire Wideband A/F Sensor for Mazda 6 2.0L MZR (2010-2012) | LFDC188G1

Suitable for Upstream Air Fuel Ratio Sensor for Mazda MX-5 Miata 2.0L (2016-2018) | 234-5720 P51B188GX

Suitable for 4Pcs Fuel Injector Set for Mazda Miata 1.8L (1999-2000) | 195500-3310 FJ584

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

Suitable for 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) | 234-5039

Suitable for 2Pcs O2 Sensor Up & Down for Mazda MX-5 Miata 2.0L (16-18)| 234-5720 234-8000

Suitable for 5-Wire Upstream Air Fuel Ratio Sensor for Mazda 6 2.3L (02-07) | LFH1188G1

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

Suitable for Upstream Air Fuel Ratio Sensor for Mazda 6 2.5L (2009-2013) | 234-5033 L518-18-8G1A

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

Mazda

Filters

2Pcs Air Fuel Ratio & O2 Sensor for Mazda 2 1.5L (2011-2013) | 234-9103 234-4329

Suitable for 5-Wire Upstream Air Fuel Ratio Sensor for Mazda CX-7 2.3L (07-12) | 234-5012 L33L188G1B

Suitable for 2Pcs O2 Sensor Upstream & Downstream for Mazda 6 2.5L (2009-2013) | 234-5033 234-4279

Suitable for 2Pcs Air Fuel Ratio Sensor for Mazda CX-7 2.3L Turbo (07-09) | 234-5012 234-4044

4Pcs O2 Sensor Set for Ford Edge & Mazda CX-9 3.5L 3.7L (2007-2009) | 234-4372 234-4610

Suitable for 2Pcs Oxygen Sensor for Mazda 3 Mazda 5 2.0L 2.3L (04-07) | 234-4390 234-4396

Downstream O2 Sensor for Mazda CX-5 CX-9 2.0L 2.5L (2013-2024) | 234-4583, 250-241074

2Pcs Air Fuel Ratio & O2 Sensor for Mazda CX-3 Toyota Yaris iA 1.5L 2.0L (2016-2018) | 234-5722 234-8000

Upstream Air Fuel Ratio Sensor for Mazda CX-3 Toyota Yaris iA Scion iA (2016-2018) | 234-5722, 89467WB001

2Pcs Air Fuel Ratio & O2 Sensor for Mazda 3 2.0L 2.3L Turbo 2.5L (2010) | 234-5041 234-4467

2Pcs Air Fuel Ratio & O2 Sensor for Mazda 6 2.5L & 2.5L Turbo (2018-2021) | 234-5733 234-4939

Upstream Air Fuel Ratio Sensor for Mazda 6 CX-5 CX-9 2.5L (2016-2024) | 234-5733

2Pcs Air Fuel Ratio & O2 Sensor for Mazda MX-5 Miata 2.0L (2006-2008) | 234-9088 234-4340

2Pcs Air Fuel Ratio & O2 Sensor for Mazda 3 2.0L (2010-2013) | 234-5015 234-4467

Upstream 5-Wire Wideband A/F Sensor for Mazda 6 2.0L MZR (2010-2012) | LFDC188G1

Suitable for Upstream Air Fuel Ratio Sensor for Mazda MX-5 Miata 2.0L (2016-2018) | 234-5720 P51B188GX

Suitable for 4Pcs Fuel Injector Set for Mazda Miata 1.8L (1999-2000) | 195500-3310 FJ584

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

Suitable for 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) | 234-5039

Suitable for 2Pcs O2 Sensor Up & Down for Mazda MX-5 Miata 2.0L (16-18)| 234-5720 234-8000

Suitable for 5-Wire Upstream Air Fuel Ratio Sensor for Mazda 6 2.3L (02-07) | LFH1188G1

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

Suitable for Upstream Air Fuel Ratio Sensor for Mazda 6 2.5L (2009-2013) | 234-5033 L518-18-8G1A

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