Question about 2001 Toyota Highlander
If the front of the engine is facing you, Bank 1, Sensor 1 is located on the top right....the sensor closes to the water temp sensor.
Posted on Jan 20, 2013
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Posted on Jan 02, 2017
SOURCE: bank 1 sensor 1 error
look at the exhaust pipe and manifold you will see 1 sensor at the header and the other before or after the cat, depending on if you have to exhaust pipes.
Posted on Jun 13, 2009
behind the cat, you need to know on that car which is bank 2 left or right, the 2nd 2 is last sensor. beware this might work which means the cat has failed
Posted on Aug 15, 2009
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.
Posted on Nov 18, 2009
Bank 2, sensor 2 is a heated O2 sensor located below (after) the catalytic converter on the passenger-side. When this sensor gets clogged and/or goes bad from rust and heat fatigue, the voltage drops low enough to cause the electronic control module to register error code P0161, which then causes the check engine light to come on.
To replace Bank 2, sensor 2, remove the debri shield from just behind the front bumper, underneath the vehicle. There will be 10 bolts holding it on (10mm, I believe). After removing it, look toward the center of the newly exposed area and you will see 2 finger-like objects projecting out from the engine with wires coming out of each. The one on the left (passenger-side) is bank 2, sensor 2. The one on the right (driver-side) is bank 1, sensor 2.
I got my direct-fit sensor online for $55 from Remart Auto Parts. I know it is tempting to get the universal-fit type and save the cash. But after doing that once, I wouldn't care to do it again.
I found a YouTube video showing pictures of where the two lower (after catalytic converter) sensors are located. While the video only points out the driver-side sensor (bank 1, sensor 2), it's easy to spot the other one being only inches away.
If anyone has found this helpful at all, please vote for me.
Posted on Jan 08, 2010
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