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ply48 12/4/2012

2000 Lexus RX300 Base 6 Cyl 3.0L


i have a code PO141 O2 sensor bad, with 3 sensors how can i determine which one is bad. a heated o2 sensor bank 1 senso

2 Answers


jeffrslocum 1/18/2013

Bank 1 is in the exhaust that comes from the side of the engine containing cylinder number 1, Bank 2 is the exhaust that comes from the side of the engine containing the even numbered cylinders. Sensor 1 is before the catalytic converter, sensor 2 is after the catalytic converter


ply48 2/3/2013

So with the Bank 1 sensor 2 it is after the catalytic converter?

Walker Pro

Walker Pro 5/7/2013


Your Vehicle is equipped with two Air Fuel Ratio Sensors upstream of the catalytic converter in each exhaust manifold on the engine.
It is also equipped with a switching sensor downstream of the catalytic converter.
The Bank one sensor will be located on the engine bank with the Number one cylinder or the Bank that is farthest forward on the engine.
As a word of caution here, it is wise to replace all of the sensors when this happens or it is likely you will have another check engine light soon after replacing the first sensor.
The upstream sensors are Walker Part Number 250-54054 & the downstream sensor is Walker Part Number 250-24277.

If you have any further questions or concerns please contact us and we will be happy to help.

Walker Pro (www.walkerproducts.com)


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