Regulates oxygen intake to sustain the engines operational demands
Manufactured to withstand high engine temperatures
Guaranteed against poor workmanship and material defects
Part number is specific to the vehicle's year, make and model
Longer Sensor Life
Customers Who Purchased This Also Purchased
The oxygen sensor is a device which determines the oxygen content of the exhaust gas. Located in the exhaust system, the oxygen sensor produces a voltage proportional to the amount of oxygen in the exhaust versus the air (<150 mV lean & >750 mV rich). This data is used to control the air-fuel mixture through PORT or TFI injectors and carburetors. Sensors are monitored or checked anywhere from 4 to 100 times per second. The air-fuel mixture is thus always moving from rich to lean averaging very close to stoichiometric (ideal) ratios. The ceramic sensor body is contained in a housing which protects it against mechanical effects and facilitates mounting. The ceramic body is made of stabilized zirconium dioxide (zirconia). Its surfaces are coated with electrodes made of a gas-permeable platinum layer. In addition, a porous ceramic coating has been applied to the side exposed to the exhaust gas. This coating prevents contamination and erosion of the electrode surfaces by combustion residue and particulates in the exhaust gases.
Walker Products began supplying the fuel system needs of the automotive industry in 1946. Today Walker is one of the largest, privately owned manufacturers of fuel system components and engine sensors, and has served the needs of the worldwide automotive aftermarket. We are committed to supplying products manufactured to meet or exceed OEM standards and specifications. This effort is backed by our own manufacturing, product management and engineering staff to ensure it is maintained and accurate in the production of quality parts, vehicle applications, instruction sheets and technical support. Our products include Carburetor and Fuel Injection Repair Kits, Oxygen Sensors and other Engine Management products such as Throttle Position Sensors, Cam and Crankshaft Sensors, Fuel Injectors, Spark Plug Wires and Gaskets. As an ISO 9001:2008/TS16949 certified company, we are committed to supplying the highest quality products.
1 Year Parts from Installation Date
Most Helpful Customer Reviews
I was going to purchase a Denso product, but they were no in stock so I decided on this Walker.
My 4Runner was puttering in fuel economy. I used to get 18-21 and was now getting about 16. My muffler was dying, so I figured I'd replace both muffler (used a Walker 18901 Exhaust Muffler) AND the up-stream O2 sensor. I've been told the down-stream O2 sensor does not effect fuel economy, but only tells the computer if the CAT is working or not.
This Walker sensor (250-24154) was the proper model for PRE-cat (upstream) O2 sensor. I have a 2000 Toyota 4Runner, non-California, 3.4L, manual transmission 4x4.
Be sure to find the exact fit. There IS a difference between upstream, downstream AND air-fuel ratio sensors.
Toyota started adding air-fuel ratio sensors to the 4Runners in 1998 CALIFORNIA MODELS, but didn't put them in non-Cali. models until 2001.
SO sometimes online guides will say you have an air-fuel sensor when you really...
i like it it fit right on the car. thank you for the info. no need to say more ill get another one
Product was as stated and installed without difficulties
The authorised South African distributor of this product is under no obligation to honour the manufacture's guarantees/warranties or to provide after-sales service.
Please note that this item is imported from the USA, and is designed to be used in the USA. In addition, if the unit is powered it will come with a US plug and an adapter/transformer may be required. Please click here for more information on power requirements, or check with us if you are unsure or need any assistance!
Please also note that certain items cannot be imported, these include Alcohol, Animals, Batteries, Flammable Materials, Currency, Food, Furs, Chemicals, Explosives, Medications, Plants, Seeds, Supplements, Pressurized Cans, Tactical Equipment, Vitamins, Weaponry and Weaponry Accessories. In these cases, the item and information is displayed for reference purposes only. If you are not sure if we are permitted to bring an item, please send us an e-mail with a link to the item to confirm.
Please also ensure that you are ordering the correct item for your particular application as returns to the USA are costly. Product reviews are also provided for most of our items, which can give you a good idea for possible things to look out for and the quality of the item. By clicking Add to Cart, you are confirming that the item is correct and you accept the conditions listed here.