First the answer to your second question. "Generally" the stated life of the O2 sensor is 100K. When one goes bad, the 'check engine light' should come on and the diagnostics from that should tell you which one is bad. If your vehicle has at least 100K, then you get into the "might as well as" area-if one is bad, could the others be far behind?
Replacement on your vehicle does not normally require the special socket for O2 sendors.
The number one upstream sensor is located between the motor and firewall, the number two upstream sensor is located between the motor and radiator, and the downsteam is located under the car. Replacing number one upstream and the downsteam sensor both require jacking up the vehicle to work from underneath. Replacement of the number 2 upstream sendor can be done with just the hood up.
First, unplug the sensor from the wiring harness.
Second, remove with a 22mm boxed or open end wrench.
Third, compare your purchase with the sensor that has been removed.
Replacement is the opposite of removal, install with 22 mm wrench and plug in.
You may have to disconnect the battery to clear the check engine dash lite and code.
According to the Haynes shop manual, the two upstream sensors are located on the exaust manifolds. The downstream sensor is located behind the rear flange for the downstream catalyst, just ahead of the front muffler.
There are two (2) O2 sensors, one (1)upstream behind the engine and one (1) downstream behind the catalytic converter. This applies to the 1.8 liter 2003 to 2012 for certian and probably most Corollas
There is no sensor by this name in a toytota. The Toyota air/fuel sensor is also known as the upstream air/fuel sensor. The Toyota downstream sensor is also known as the downstream O2 sensor.
It has 2. An upstream or bank 1 sensor 1, and a downstream or bank 1 sensor 2. One on either side of the catalitic converter starting just below the manifold. The one nearest the manifold is bank 1 sensor 1.
If it is a 4 cyl. it has 2, one in front of the catalytic converter (Upstream), and one after the catalytic converter (Down stream).
on you exg. there is 2 02 sensors. upstream and downstream up is before the cat, downstrem is after. most 02 sensors are a bolt desing and hold themselfs in, so under the truck find the bolt with a black wire looking thing after the cat bolted into the exg., disconect it from the plug an play point (sohuld be somewhere under the truck, not to hard to find) and unbolt it. then reverse steps to install.
Toyota RAV4's have two (2) O2 sensors.
The one closest to the exhaust manifold is the upstream O2 sensor.
There are two sensors in that exhaust system. Only one is called an O2 sensor and it is located in the exhaust system after the catalytic converter, also known as downstream.. The other sensor is called an Air/Fuel Sensor and is located before the catalytic converter, also known as upstream.
The 2003 Toyota airbag sensors can be found behind the front bumper and inside of each door. There is a total of seven airbag sensors.
Right after the catalytic converter, only about a foot away from the upstream O2 sensor. If you must replace either O2 sensor, I strongly recommend using only genuine Denso sensors, you can get a compatible (solder in) on for as little as $35 (see Amazon for example). Other brands do not meet Toyota's extra sensitive requirements. For the downsteam O2 sensor, you can also install a spark non-fouler ahead of the O2 sensor to avoid "catalytic convert efficiency below threshold" error code that is quite common on this car when it has high miles.
What type of sensors are you talking about? There are many sensors, and many different types.
You have two oxygen sensors in Toyota Rav4, One before the catalytic converter and another after.
Some brands of cars that have car reversing sensors include Toyota and Dodge. For example, the Toyota Sienna has sensors that alert the driver when there is an object directly behind the rear bumper.
The 1987 Toyota Pickup came equipped in two 2.4L variants between turbocharged and naturally aspirated. This application has upstream sensors (Position 1), that is they are located on the exhaust manifold before the catalytic converter. The OE replacement O2 sensor is AC Delco #213119.
In the manifolds - sometimes difficult to get at.
2, both are in the exhaust system .I am told the rear one usually is the one that need to be replaced . local Toyota dealer tells me they hardly ever replace the front one.
Oxygen sensors on a 1989 Toyota SR5 and located near the catalytic converter. The sensors read the emissions from the vehicle so the ECU knows ho much fuel to run in the engine.
There are 2 bank of o2 sensors on Toyota Avalons. Bank1 sensors are on the exhaust piping. Sensor 1 is BEFORE the catalytic converter and is the one you need to look at. Although it is possible it just needs a good cleaning, it is easy to replace. A 22mm metric wrench and some anti-seize will do it.
video on removing O2 sensor: http://www.youtube.com/watch?v=ttUHqVz-sL0 technical info on O2 sensors: http://www.babcox.com/editorial/us/us10226.htm
take it to the Toyota dealership and ask them to replace it
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