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Re: Toyota Highlander 2004 needs O2 sensor bank 2 sensor...
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
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They are usually in the exhaust system. Look at the engine with the belts and pulleys nearest to you. Bank One is the left side and Bank Two is the right side.
There is a bulge in the exhaust nearest the engine which is the Catalytic Converter. Sensor One is before it and Sensor Two is after it. This is for both banks of the engine.
The one you want will be the left side after the Catalytic Converter. SAFELY get under the front of the vehicle and it should be mounted in the exhaust pipe just as it bends to run under the vehicle. Please use the comment button below if you need more help.
The code 1055 is brand specific, and for Toyota it means there is a problem with the heater circuit for the O2 sensor bank 2 sensor 1. That is the sensor in front of the catalytic converter or split and on the side with cylinder number 2 which may be the passenger side. The sensor could have failed, or it could be a problem with the power source for the heater inside the sensor.
That's a code for the heater circuit for the bank 1 sensor 1 O2 sensor.
Bank one is always the same side of the engine as the number 1 cylinder (V-6 engines). Sensor 1 is always before the catalytic converter.
you have 4 O2 sensors, bank one is the front cylinders ( close to the readiator ) there is 2 bank 1 O2 sensors one infront of the catalitic convertor ( bank 1 sensor 1 ) and one after the convertor ( bank 1 sensor 2 ) the same on the back cylinders they are bank two sensors 1 & 2 i will try to post the location of the wiring plugins if you find the plugs then you can folow the wiring to the sensor....good luck
A p0420 sets after Engine and catalyst are warmed up, vehicle driven within set vehicle engine speed range and waveforms of heated O2 sensors bank 1 sensor 1 and bank 1 sensor 2 have the same amplitude. Catalytic convertor and O2 sensors need to be tested
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.
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