Walker Products 250-23004 oxygen sensor for the 1985 Chevrolet Impala V6 4.3L and other vehicles reads the oxygen in the exhaust gas to track combustion efficiency. This upstream 3-wire narrow-band sensor sends the ECU the diagnostic feedback it requires.
- Electrodes made of a gas-permeable platinum layer
- Measures exhaust oxygen to help fine-tune the air-fuel mixture for fuel economy
- Reads the oxygen content of the exhaust gas to monitor the air-fuel ratio for combustion efficiency
- Monitors exhaust gases to help reduce pollutants
- Coating protects the electrode surfaces from contamination and erosion by combustion residue and particulates
Quick facts
- Part: Walker Products 250-23004 oxygen sensor
- Fits: 1985 Chevrolet Impala V6 4.3L and other vehicles
- Position: Upstream
- Condition: New
A failing oxygen sensor can show up as rough running, higher fuel consumption, more exhaust emissions or a lit malfunction indicator light, and each of those can come from other parts too. Before you replace it, look over the sensor, its wiring harness and its connector for physical damage, with the engine off and cool.
Fits
This listing is one sensor, and each vehicle takes one. It is a direct-fit replacement for the 1993-1995 Isuzu Pickup 4-cylinder 2.6L, the 1995 Pickup 4-cylinder 2.3L and the 1994-1995 Honda Passport 4-cylinder 2.6L. If your vehicle is not named here, look up its year, make and engine in the "Vehicles it fits" section before you order.
Specifications
Fit and size
- Position: Upstream
- Quantity per vehicle: 1
- Thread size: M18 - 1.5, threaded
Build and materials
- Type: Narrow-band, 3-wire, direct fit
- Electrodes: gas-permeable platinum layer
- Condition: New
Product information is for general reference and may contain errors. See our Disclaimer.
Frequently Asked Questions
Is this the Chevy Impala oxygen sensor for a 1985 model with the V6 4.3L?
Yes. Walker Products 250-23004 is listed for the 1985 Chevrolet Impala V6 4.3L, and that car takes one upstream sensor. For a different year or engine, look up your car in the "Vehicles it fits" section.
Is this the Honda Passport oxygen sensor for a 1994-1995 model with the 4-cylinder 2.6L?
Yes. Walker Products 250-23004 is listed for the 1994-1995 Honda Passport 4-cylinder 2.6L, and each of those vehicles takes one sensor.
Is this Walker Products oxygen sensor upstream or downstream?
Upstream. Walker Products 250-23004 is a 3-wire narrow-band sensor with a threaded M18 - 1.5 body, sold as one sensor per listing.
What does the coating on this oxygen sensor protect against?
The coating keeps combustion residue and particulates in the exhaust gases from contaminating or eroding the electrode surfaces. The electrodes are made of a gas-permeable platinum layer.
Will the ECU store a fault code if this sensor fails?
Newer vehicles can store fault codes in the ECU, and some relate to the affected sensor and its circuit. A shop can read them, and the malfunction indicator light may come on.
