It could depend on what exhaust system is fitted. The general rule is that there should be an O2 sensor fitted before (upstream) of the catalytic converter AND one fitted after (downstream) of the catalytic converter. This applies to ALL the catalytic converters fitted to the vehicle. V8's often run two exhausts, one each side.
Get 'safely' under the vehicle and find the exhaust where it turns down and under the vehicle. Look up into the engine bay and find the fat bulge in the pipe, the catalytic converter. The upstream sensor is up high, often in the exhaust manifold. Your downstream sensor will be nearest to you, after the bulge. If you have a twin exhaust system you'll also need to know which side it is on, it will listed as either Bank One or Bank Two.
Please comment if you need more help.
Just a note. Some of the the Tundra models mount the downstream sensor nearer the middle of the exhaust. Roughly level with the transmission box that splits the front and rear wheel drive shafts.
Try this link.https://youtu.be/vEL_xCBELmA
×
SOURCE: Oxygen Sensor Location 2001 Ford Expedition Eddie Bauer
There are four o2 sensors on this truck. one on each side just below the exhaust manifold, and one on each side behind the second catalytic converters. (just about even with the back of the front doors.
SOURCE: 2005 Subaru Legacy: Where are the O2 sensors located (both)
the o2 sensors are locted in the exhaust system. upstream is before cat converter, downstream is after cat converter.
SOURCE: P0420 and P0430
The AF sensors are uupstream and the O2 down stream. The car' s computer tests them and it is saying your cats are bad. If you have a scan tool you could look at the data and see what the sensors are seeing. The Af sensors are the ones that control the fuel ratio in the car while the O2's just watch. AF's would be the one to change but there is no garuatee that the codes won't come back.
SOURCE: p0051 code, where is the sensor located, where is
Bank 2 is passenger side, sensor 1 is the one up closest to the exhaust manifold. Plug in type (just remove old and plug back into the wiring harness connector) is about $90 at Autozone. You can get a cheaper one that you splice but it's confusing to understand which wires to splice together. Don't forget to buy the special socket, $10, to remove and install the sensor. It's split up the side for the wires. Forget trying to use an open end wrench, socket is best.
SOURCE: cant find bank 1 sensor 1 oxygen sensor on a 2001 toyota tundra
Drivers side is bank 1, sensor 1 is found by looking up from under the truck on the exhaust pipe just below the manifold.
Fig. Fig. 3: Oxygen sensor-4.3L engines
Fig. Fig. 4: Oxygen sensor-5.0L and 5.7L engines
Fig. Fig. 5: Oxygen sensor-7.4L engines
Oxygen sensors are always numbered like this:
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2
Some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2
Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.
Sensor 1 is always the upstream sensor (the one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.
Hope helps (remember to rate this).
176 views
Usually answered in minutes!
×