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No picture is needed. If you pop your hood and look a the side of the motor (passenger side, with headers) You should see two sets of 3 runners. B1S1 will be the highest sensor on the right hand side (closest to radiator). B2S1 will be directly accross from it, highest sensor closest to firewall. B1S2 will be the only other sensor on the exhaust manifold lower sensor under B1S1. And finally B2S2 is the last sensor that is underneath the car on the y-pipe.
 

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Digger08
 
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Thanks digger08, I added that to the FAQ, with credit given.
 

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Lucky dog...you can do your own work. I had one replaced last week...and it cost me plenty.
 
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