Walker Products 250-21004 oxygen sensor for the 1984-1986 Ford F-150 6-cylinder 4.9L, the 1985-1986 F-150 V8 5.0L and other vehicles measures the oxygen content of the exhaust gas. It is a direct-fit, narrow-band upstream sensor made for its specific application and fitment position, and it gives the ECU the feedback it expects.
- Measures oxygen levels to help fine-tune the air-fuel mixture and support fuel economy
- Monitors exhaust gases to help reduce pollutants
- Coating protects the electrode surfaces from contamination and erosion by combustion residue and particulates
- Determines the oxygen content of the exhaust gas to monitor the air-fuel ratio for combustion efficiency
- Electrodes made of a gas-permeable platinum layer
Quick facts
- Part: Walker Products 250-21004 oxygen sensor
- Fits: the 1984-1986 Ford F-150 6-cylinder 4.9L, the 1985-1986 F-150 V8 5.0L and other vehicles
- Position: Upstream
- Condition: New
A failing sensor can make the engine run poorly, raise fuel consumption or exhaust emissions, or turn on the malfunction indicator light, though a damaged wiring harness or connector can be behind the same signs, so look both over for physical damage before you replace the sensor.
Fits
The 1984-1986 Ford F-250 6-cylinder 4.9L, the 1985-1986 F-250 V8 5.0L, the 1981-1983 Jeep Cherokee 6-cylinder 4.2L and the 1984-1986 Cherokee 4-cylinder 2.5L are among the vehicles this sensor fits, along with many more. These engines each take one upstream sensor, and this listing is that one sensor.
Specifications
Fit and size
- Position: Upstream
- Quantity per vehicle: 1
Build and materials
- Sensor type: Narrow-band, direct fit
- Electrodes: gas-permeable platinum layer
- Electrode coating: protects against contamination and erosion
- Condition: New
Frequently Asked Questions
Is this the Ford F-150 oxygen sensor for a 1984-1986 F-150 with the 6-cylinder 4.9L?
Yes. Walker Products 250-21004 fits the 1984-1986 Ford F-150 6-cylinder 4.9L and the 1985-1986 F-150 V8 5.0L. For any other vehicle, run your year and engine through the "Vehicles it fits" section.
Does this Jeep Cherokee oxygen sensor fit a 1984-1986 Jeep Cherokee 4-cylinder 2.5L?
Yes. The 1984-1986 Jeep Cherokee 4-cylinder 2.5L is listed for Walker Products 250-21004, and so is the 1981-1983 Cherokee 6-cylinder 4.2L.
Is this Walker Products oxygen sensor a narrow-band type?
Yes. Walker Products 250-21004 is a narrow-band sensor. It determines the oxygen content of the exhaust gas to monitor the air-fuel ratio for combustion efficiency.
Is this oxygen sensor for the upstream or downstream position?
It is an upstream sensor. Each Walker Products part number is made for its specific application and fitment position, so this one is not a downstream unit.
What does the coating on this oxygen sensor do?
The coating prevents contamination and erosion of the electrode surfaces by combustion residue and particulates in the exhaust gases. The electrodes are made of a gas-permeable platinum layer.
