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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.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2021
Total Annual:
10000000-50000000
Employee Number:
50~99
Ecer Certification:
Verified Supplier
Company Overview
Hefei Ruimin Auto Sensor Co., Ltd. (hereinafter referred to as “Hefei Ruimin”) is a leading manufacturer and global trader specializing in the R&D, production, and sales of high-quality automotive sensors. Headquartered in Hefei, a renowned technology and industrial ... Company Overview
Hefei Ruimin Auto Sensor Co., Ltd. (hereinafter referred to as “Hefei Ruimin”) is a leading manufacturer and global trader specializing in the R&D, production, and sales of high-quality automotive sensors. Headquartered in Hefei, a renowned technology and industrial ...