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Retired Contributor
2010 Tundra/2015 4 Runner/2007 Prius
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5,942 Posts
Sensor 1 is before the cat, sensor 2 is after.. and I would definitely stay away from the Bosch sensor. Get a Denso or Delco if possible, Denso is most likely the company who makes the OE sensor.
excellent advise
Why not try a dealership that gives discounts to TS memebers.
PM me for details
 

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Retired Contributor
2010 Tundra/2015 4 Runner/2007 Prius
Joined
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5,942 Posts
On a V-8 Bank 1 is the drivers side (LEFT)
On a V-6 Bank 1 is the passenger side (RIGHT)

02 sensors = The oxygen sensor is a measuring probe for determining the amount of oxygen in the exhaust; actually they are mounted inside of your exhaust pipe. Oxygen sensors does their job by continually monitoring exhaust gases and signals the engine computer to adjust the air/fuel ratio to make sure that gasoline combustion is as complete as possible, thus reducing harmful emissions while also improving engine performance and fuel efficiency.
If the mixture is too rich or too lean, the oxygen sensor adjusts the amount of fuel that enters your engine accordingly. The wrong mix of gasoline and oxygen can increase pollutants that exit your vehicle – thereby harming the environment. And not only that, it is also one of the causes of faulty catalytic converter and engine damage. Therefore, a properly working oxygen sensor is a must for every car. But like any other car parts, oxygen sensors don’t last forever. The normal aging process will eventually cause the oxygen sensor to stop working.

I get all my parts from a Toyota deaership, they cost as much or LESS than the aftermarket stuff. Pm me for details
 
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