I apologize in advance if my description is not completely correct, but the method is correct.

Generally speaking, a byte is made up of 8 bits. The decimal value of a byte is the sum of its bits (in decimal). A bit only has two possible values in binary, 0 and 1.
In order to set the individual bits of a byte you will need to determine the decimal value of the bit that you want to set.

BV = binary value (0 or 1)

Bit       7              6              5               4              
Byte = BV*2^7 + BV*2^6 + BV*2^5 + BV*2^4 +         
           BV*128 + BV*64    + BV*32   + BV*16   +

Bit       3              2              1               0
Byte = BV*2^3 + BV*2^2 + BV*2^1 + BV*2^0  
           BV*8     + BV*4     + BV*2     + BV*1


Example: CWKONLS

            bit 7 6 5 4 3 2 1 0
               +---------------+
CWKONLS |x x x x x x x x|
               +---------------+
               ^ ^ ^ ^ ^ ^ ^ ^
                |  |  |  |  |  |  | +-- B lsv
                |  |  |  |  |  | +---- B lsh
                |  |  |  |  | +------ B ls3
                |  |  |  | +-------- B ls4
                |  |  |  +---------- B lsv2
                |  |  +------------ B lsh2
                |  +-------------- B ls32
                +---------------- B ls42


For front O2 sensors you need to set bit 0 (B_lsv) and bit 4 (B_lsv2):

bit 0 = 1*2^0 = 1*1  = 1
bit 4 = 1*2^4 = 1*16 = 16

CWKONLS = 17

For rear O2 sensors you need to set bit 1 (B_lsh) and bit 5 (B_lsh2):

bit 1 = 1*2^1 = 1*2  = 2
bit 5 = 1*2^5 = 1*32 = 32

CWKONLS = 34

For all four sensors:

CWKONLS = 51

Can you explain further?

How can you calculate the on/off value of a bit of a byte in hex?

This is something that was unclear to me for a while so I thought it may help out others.

Ahh...I see.

Binary to hex to decimal is still a little abstract to me.