Walker Products 350-34478 oxygen sensor for the 1990-1991 Toyota 4Runner 4-cylinder 2.4L or V6 3.0L and other vehicles measures the oxygen content of the exhaust gas. Built for its specific application and position, it gives the ECU the diagnostic feedback it requires.
- Monitors the air-fuel ratio through the oxygen content of the exhaust gas
- Measures oxygen levels so the air-fuel mixture can be fine-tuned for fuel economy
- Coating protects the electrode surfaces from contamination and erosion by combustion residue and particulates
- Electrodes made with a gas-permeable platinum layer
- Monitors exhaust gases to help reduce pollutants
Quick facts
- Part: Walker Products 350-34478 oxygen sensor
- Fits: 1990-1991 Toyota 4Runner 4-cylinder 2.4L or V6 3.0L and other vehicles
- Position: Upstream, upstream left, upstream right
- Condition: New
Rough running, higher fuel use, more exhaust emissions or a lit malfunction indicator light can mean the sensor is worn, though a damaged wiring harness or connector can produce the same signs, so look both over for physical damage too.
Fits
The 1990-1991 Toyota 4Runner 4-cylinder 2.4L or V6 3.0L, the 1989-1991 Toyota Pickup 4-cylinder 2.4L or V6 3.0L and the 1988-1989 Toyota Land Cruiser 6-cylinder 4.0L all take this direct-fit oxygen sensor, as do other vehicles.
Specifications
Fit and size
- Position: upstream, upstream left, upstream right
- Quantity per vehicle: 1
- Number of wires: 4
- Mounting: flange mount
Build and materials
- Type: narrow-band, direct fit
- Electrodes: gas-permeable platinum layer
- Coating: on the electrode surfaces
- Condition: New
In the box
This listing is one oxygen sensor, and a vehicle takes one.
Interchange: CTK-OSTO4013
