P0161 Chevrolet -1998 k1500 5.7

Question

is there 2 of these heated rear sensors on the 5.7 1998; and are they the same.
I guess the 2 front ones are the same!!??
Thankyou!

Answer 1

P0161 H02S heater perfromance Bank 2 Sensor 2

There is 2 rear H02S sensor the rear are the downstream 02 sensor, the front are the upstream 02 sensor.  The 2 rear are the same, as for the front they are also the same for the front.