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cecil

cecil 8/5/2011

2003 Lexus ES300 Base 6 Cyl 3.0L

Engine

Where is the B2S1 Oxygen Sensor located?

Where is the B2S1 Oxygen Sensor located?
What DENSO part OE is recommended?

1 Answer


Jimm

Jimm 8/5/2011

The Bank 2, Sensor 1 (B2S1) is located on the 4-5-6 cylinder head exhaust manifold downpipe - just ahead of the catalytic converter. The Bank 2, Sensor 2 would on the same pipe just downstream (aft) of the converter.
Try the many on-line auto parts sources, such as; www.RockAuto.com or www.autopartswarehouse.com for the specific O2 sensor. They (Rock Auto) list the O2 sensor from; Denso, Beck Arnley, Bosch, and Standard for around $34.00. They are not difficult to replace - try the 'How-To-Guides' feature on this website for details - including photos.

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Jimm

cecil 8/5/2011

thanks, but where is the 4-5-6 cylinder head exhaust manifold located? What is called the "upstream" or "downstream" ?

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