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S1 bank 1 sensor...Oh please...Where is it?

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11K views 3 replies 3 participants last post by  ferret  
A
#1 ·
Getting a code for the S1 bank 1 O2 Sensor.

It's an '03 XS.

I looked around and the only O2 sensors I seem to find are at the Cat, one facing forward in front and one in the back, directly on top.

Are these the only two?

And would the S1 be the first (forward one)?

I searched around, but can't find a definitive answer.

Thanks!
 
#4 ·
The flat 4 only uses what the scanners call Bank 1. So you have S1 ( front ) and S2 ( rear ).

My Wife's V6 Highlander has Bank 1 S1 , S2 AND Bank 2 S1 , S2 ...... That recently was one expensive repair.
 
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