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Car Oxygen Sensor L34B18861A/L34B18861B For Mazda
Car Oxygen Sensor L34B18861A/L34B18861B For Mazda
Specifications
Model Number :
L34B18861A/L34B18861B
Tested :
100% Tested
Price :
To Be Negotiated
Packaging Details :
Foam Bag + Paper box
Cable Length :
Approx. 350 mm
Supply Ability :
20000pcs/Month
Model :
Mazda
Connector Type :
Direct-Fit
Light-Off Time :
≤ 15 seconds
Place of Origin :
China
Payment Terms :
T/T
Thread Diameter :
M18 × 1.5
Delivery Time :
1-4weeks
OE Number :
L34B18861A/L34B18861B
MOQ :
50
Brand Name :
RMOS
Quality :
OE Quality
Technical Information :
Sensor Type: O2
Description
Car Oxygen Sensor L34B18861A/L34B18861B For Mazda
Product Specifications
Specification Details
OE Part Number L34B18861A (also L34B-18-861A)
Brand MAZDA (Genuine Original Equipment)
Product Type Lambda Sensor (Oxygen / O₂ Sensor)
Sensor Type Heated Oxygen Sensor
Number of Wires 4
External Thread Size M18 x 1.5
Placement on Vehicle After Catalytic Converter (Rear / Lower Position)
Technical Notes
  • This is a 4-wire heated oxygen sensor manufactured to Mazda's original equipment (OE) standards. The four wires serve two independent circuits — two for the internal heater and two for the sensor signal and ground.
  • The built-in heating element quickly brings the ceramic sensing tip up to operating temperature after a cold start, enabling the ECU to enter closed-loop fuel control sooner and reduce cold-start emissions.
  • The sensor monitors oxygen content in the exhaust gases and sends data to the engine control unit to optimize the air-fuel mixture, ensuring proper emissions performance and fuel efficiency.
  • This sensor is typically installed in the rear (downstream / post-catalyst) position, located after the catalytic converter.
  • This part is a direct-fit component featuring a vehicle-specific electrical connector and pre-terminated wiring, eliminating the need for cutting or splicing during installation.
  • Genuine Mazda OE parts are designed to fit your specific Mazda model perfectly and are backed by a manufacturer's warranty.
Cross-Reference & Interchange Numbers
This Lambda Sensor is a genuine Mazda Original Equipment component. The following part numbers are directly interchangeable.
Always verify physical fitment (connector shape, cable length and thread size) with your original part before purchasing.
Type Part Number(s)
Primary OE Number L34B18861A, L34B-18-861A
Superseding OE Number L34B18861B, L34B-18-861B
Related Mazda OE Number LFBM18861
Aftermarket References ADM57036, 177507
Cross-Reference Notes
  • L34B18861B is the direct superseding part number for this sensor. The "B" suffix typically indicates a later revision or supersession of the original "A" version.
  • For Mazda vehicles, the equivalent OE numbers include L34B18861A, L34B18861B, and LFBM18861.
  • Blue Print ADM57036 is a high-quality aftermarket equivalent.
  • Febi Bilstein 177507 is another professional-grade replacement option.
  • Always physically compare your old sensor's connector shape, pin count (4), cable length, and thread size (M18 x 1.5) before purchasing.
Compatible Vehicles
This Lambda Sensor is an original equipment component primarily used in Mazda vehicles, specifically the Mazdaspeed3 and certain Mazda 3 models with 2.3L turbocharged engines.
Mazda Applications
Model Year Range Engine / Trim Position
Mazdaspeed3 2007 - 2013 2.3L L4 - Turbo (DISI Turbo) Rear / Lower
Mazda 3 2007 - 2013 2.3L L4 (Mazdaspeed trim) Rear
Mazda 3 2008 - 2013 2.0L L4 (Mazdaspeed, S, i trims) Rear
Detailed Vehicle Fitment
Year Make Model Body & Trim Engine
2013 Mazda 3 Mazdaspeed 2.3L L4 - Gas
2012 Mazda 3 Mazdaspeed 2.3L L4 - Gas
2011 Mazda 3 Mazdaspeed 2.3L L4 - Gas
2010 Mazda 3 Mazdaspeed 2.3L L4 - Gas
2009 Mazda 3 Mazdaspeed, S, i 2.0L L4 - Gas, 2.3L L4 - Gas
2008 Mazda 3 Mazdaspeed, S, i 2.0L L4 - Gas, 2.3L L4 - Gas
2007 Mazda 3 Mazdaspeed, S, i 2.0L L4 - Gas, 2.3L L4 - Gas
Fitment Notes
  • This is a rear (downstream / post-catalyst) oxygen sensor. It is installed after the catalytic converter.
  • Primary application is the Mazdaspeed3 with the 2.3L DISI Turbo engine.
  • Also compatible with select Mazda 3 models equipped with 2.0L and 2.3L engines.
  • The sensor is described as a "Lower Oxygen Sensor" or "Rear Oxygen Sensor" in Mazda parts catalogues.
  • Engine codes associated with this sensor include L3KG and L3N9.
  • How to verify: Locate your vehicle's catalytic converter. This sensor is installed in the pipe after the converter. If your faulty sensor is located before the converter, this part is not suitable for your application.
  • Not compatible with diesel engines — diesel applications use different sensors with different calibration parameters.
  • The vehicle fitment information above is a guide only. Always confirm compatibility using your vehicle's VIN or by physically inspecting your old sensor's position (rear / downstream), connector shape, and thread size before ordering.
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Car Oxygen Sensor L34B18861A/L34B18861B For Mazda

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Product Detail
Model Number :
L34B18861A/L34B18861B
Tested :
100% Tested
Price :
To Be Negotiated
Packaging Details :
Foam Bag + Paper box
Cable Length :
Approx. 350 mm
Supply Ability :
20000pcs/Month
Contact Supplier
Car Oxygen Sensor L34B18861A/L34B18861B For Mazda

Hefei Ruimin Electronic Technology Co., Ltd.

Verified Supplier
1 Years
anhui, hefei
Since 2021
Business Type :
Manufacturer
Main Products :
Auto Oxygen Sensor, Auto Nox Sensor, Throttle Position Sensor
Total Annual :
10000000-50000000
Employee Number :
50~99
Certification Level :
Verified Supplier
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