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These Lambda Sensors are Original Equipment (OE) components manufactured for Mazda vehicles, specifically designed for the Mazda 3 (BK) / Axela platform. The OE numbers Z601-18-861A and Z601-18-861B are directly interchangeable and refer to sensors used in the same vehicle family, with the primary difference being their specific position in the exhaust system.
These sensors monitor oxygen content in the exhaust gases and relay this information to the Engine Control Unit (ECU) to ensure the optimal air-fuel mixture is maintained throughout operation for efficient combustion. The sensors feature a 4-wire heated design with a planar probe, allowing them to reach operating temperature quickly for precise air-fuel ratio measurement.
Technical Specifications
Specification
Z601-18-861A
Z601-18-861B
OE Part Numbers
Z601-18-861A, Z60118861A
Z601-18-861B, Z60118861B
Sensor Type
Heated Oxygen Sensor (Lambda Sensor)
Heated Oxygen Sensor (Lambda Sensor)
Sensor Technology
ZrO₂ (Zirconium Oxide)
ZrO₂ (Zirconium Oxide)
Number of Conductors / Pins
4
4
Cable Length
500 mm (approx. 19.7 inches)
480 – 600 mm (approx. 18.9 – 23.6 inches)
Thread Size
M18 * 1.5
M18 * 1.5
Fitting Position
Upstream (Front / Pre-Catalyst)
Upstream (Front / Pre-Catalyst)
Function
Regulating Probe
Regulating Probe
Fitment Type
Vehicle Specific / Direct-Fit
Vehicle Specific / Direct-Fit
Housing Colour
Black
Black
Weight
0.15 kg (approx.)
0.15 kg (approx.)
Technical Notes:
These are 4-wire heated planar-type oxygen sensors manufactured to Mazda's original equipment standards
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 sensors are constructed with a high-quality stainless-steel shell and high-temperature resistant ABS housing, with the internal chip treated for corrosion and vibration resistance
As direct-fit components, they feature vehicle-specific electrical connectors and pre-terminated wiring, eliminating the need for cutting or splicing during installation
The threads are factory pre-greased with anti-seize compound for quick and easy installation
All sensors are manufactured to meet or exceed original equipment quality standards
Cross-Reference & Interchange Numbers
The following OE numbers are directly interchangeable with Z601-18-861A and Z601-18-861B. Always verify physical fitment (connector shape, cable length and thread size) with your original part before purchasing.
These Lambda Sensors are original equipment components primarily used in Mazda vehicles, specifically the Mazda 3 (BK) and Mazda Axela platforms.
⚠️ Important Position Note: These are upstream (pre-catalyst / front) oxygen sensors — installed before the catalytic converter. The Z601-18-861A and Z601-18-861B are functionally interchangeable for the upstream position. The downstream (post-catalyst) sensor for these vehicles typically uses a different part number (e.g., Z602-18-861A).
Mazda Applications
Model
Chassis / Generation
Year Range
Engine / Notes
Mazda 3 / Axela
BK (First Generation)
2003 – 2009
1.4L, 1.6L, 2.0L, 2.3L petrol
Mazda 3 / Axela
BK (First Generation)
2004 – 2009
2.0L, 2.3L L4
Mazda 3 / Axela
BK (First Generation)
2003 – 2009
1.4L, 1.6L
Mazda 3 Saloon
BK (First Generation)
2003 – 2009
1.3L, 1.6L
Mazda Axela
BK5P
Apr 2004+
ZY-VE engine, Right-hand drive
Mazdaspeed Axela
BK3P
Sep 2003+
L3-VDT engine, Right-hand drive
Additional Compatibility
Mazda 2 – Selected models
Mazda 6 – Selected models
Mazda MX-5 – Selected models
Detailed Engine Fitment
Engine Displacement
Engine Code
Power Output
Applications
1.3L
—
62 kW (84 hp)
Mazda 3 Saloon (BK)
1.4L
—
—
Mazda 3 (BK)
1.6L
ZY-VE
77 kW (105 hp)
Mazda 3 (BK), Mazda Axela BK5P
2.0L
—
—
Mazda 3 (BK)
2.3L
L3-VDT
—
Mazdaspeed Axela BK3P
Fitment Notes:
This is an upstream (pre-catalyst / front) oxygen sensor. It is installed before the catalytic converter and serves as the primary regulating probe for air-fuel mixture control
Both Z601-18-861A and Z601-18-861B are used in the upstream position and are functionally interchangeable for this application
The Z602-18-861A is the corresponding downstream (post-catalyst) sensor for these vehicles
How to verify: Locate your vehicle's catalytic converter. The upstream sensor is typically installed in the exhaust manifold or in the pipe immediately before the catalytic converter. The downstream sensor is installed after the converter. If your faulty sensor is located before the converter, these part numbers are suitable. If located after the converter, you need part number Z602-18-861A
Production period: These sensors are designed for vehicles manufactured between 2003 and 2009
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, connector shape, cable length, 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 ...
