Question about 2003 Toyota Highlander
The engine is the V6 model.
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Posted on Jan 02, 2017
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
SOURCE: how to replace the bank
A bank two sensor means it is on the side of the engine that does not contain the number 1 cylinder. Was there a sensor number to go along with that? Usually that code pops up as "Bank X, Sensor X" to tell you which side and sensor it is. From what I have read, Avalons have 3 O2 sensors. 2 Pre-Cat and 1 Post.
Once you figure that out, replacing one is as simple as getting an open end wrench, unscrewing and disconnecting the old O2 sensor, and reverse the procedure to install the new one.
Posted on Jul 27, 2008
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
B1S1 means first (upstream) , closest sensor to cyl. head , usualy at exhaust manifold.Bank 1 is cyl. head with cyl.#1 if you have V6 engine.
Best choice for brand - Denso.
Posted on Apr 28, 2010
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