Walker Products 350-31003 oxygen sensor for the 1990-1995 Mazda 323 4-cylinder 1.6L, the 1995 323 4-cylinder 1.8L and other vehicles reads the oxygen content of the exhaust gas. This Walker Products oxygen sensor is made for the upstream position and its specific application, and it gives the ECU the diagnostic feedback it needs.
- Narrow-band sensing design
- Coating prevents contamination and erosion of the electrode surfaces by combustion residue and exhaust particulates
- Electrodes made of a gas-permeable platinum layer
- Monitors the air-fuel ratio for combustion efficiency
- Monitors exhaust gases to help reduce pollutants
Quick facts
- Part: Walker Products 350-31003 oxygen sensor
- Fits: the 1990-1995 Mazda 323 4-cylinder 1.6L, the 1995 323 4-cylinder 1.8L and other vehicles
- Position: Upstream
- Condition: New
A rough-running engine, higher fuel use, more exhaust emissions or a lit malfunction indicator light can mean the sensor is failing, though a damaged wiring harness or connector can be behind them too, so inspect both for physical damage first.
Fits
The 1994-1995 Kia Sephia 4-cylinder 1.6L and the 1991-1994 Ford Escort 4-cylinder 1.8L take this sensor as well, along with many other vehicles, and each takes one. If your car is not named here, look it up in the "Vehicles it fits" section by year and engine.
Specifications
Fit and size
- Position: Upstream
- Quantity per vehicle: 1
Build and materials
- Type: Narrow-band, direct fit
- Electrodes: gas-permeable platinum layer
- Condition: New
Frequently Asked Questions
Is this the Mazda 323 oxygen sensor for a 1990-1995 model with the 4-cylinder 1.6L?
Yes. Walker Products 350-31003 is listed for the 1990-1995 Mazda 323 4-cylinder 1.6L and the 1995 323 4-cylinder 1.8L. The "Vehicles it fits" section covers other vehicles.
Is this the Ford Escort oxygen sensor for the 1991-1994 model with the 4-cylinder 1.8L?
Yes. Walker Products 350-31003 is listed for the 1991-1994 Ford Escort 4-cylinder 1.8L, and that car takes one sensor.
Is this oxygen sensor an upstream or a downstream unit?
This oxygen sensor is made for the upstream position and is a narrow-band type.
What are the electrodes on this oxygen sensor made of?
The electrodes are made of a gas-permeable platinum layer. A coating protects them from contamination and erosion by combustion residue and particulates in the exhaust gases.
Can a failing upstream oxygen sensor turn on the check engine light?
Yes. A failed sensor may cause rough running, higher fuel use, more emissions or a lit malfunction indicator light, and newer vehicles store related fault codes in the ECU.
