if im not mistaken witch i could be your vehicle should have 3 sensors 1 on left side before cat. 1 on the right side before cat and one after cat there for the 1 on the left would be b2s1,the one the right before cat would be b1s1,and the one after cat would be b1s2.hope this helps.

Answered by jeftfields
1 question asked

ok i'm gonna take a stab at this, i've worked on these motors plenty of times, but it's been a while. i'm used to reading o2 sensor data on the scan tool to inform me of which is bank (1) or bank (2). with a 4.3 you should have (1) o2 sensor on the left side and (3) on the right. i believe the sensor you're looking for is the one before the cat convertor. the other (2) will be sensor (1) on the left and sensor (1) on the right. i hope i'm making sense to you, anyway let me know and good luck :D

Answered by bootdog
20 questions asked

Sensor 2 is behind the cat, strictly measures the efficiency of the converter.If you vehicle only has one behind the cat thaen that is it, sometimes they call for bk1 or bk2 behind the cat but there is only one sensor. Otherwise the drivers side of the engine is bk1

Answered by Jack42
21 questions asked