replaced b2s1 on infiniti i35 2003 due to p0051 code. after replacing now getting p0051 and p1168

Question

infiniti i35 2003 v6 - was getting p0051 code with engine light on. replaced B2S1 o2 sensor but now getting p0051 and p1168
disconnected the battery + terminal for more than an hour and after connecting it back still getting the codes.

Answer 1

P0051 H02S heater  Bank 2

P1168 Closed loop control  Bank 2

Both code are set when the ECM does not see the 02 sensor on Bank 2 , and both code are set for Sensor 1, which is the engine management sensor. P1168 occurs when the 02 sensor is a open circuit or a short circuit. You basically have a P0153.. The first step that should be performed is to check the fuse see if the fuse is open replace if it is, also check to see if there is power on it  Use you engine fuse / relay cover for the location , this may be listed as Fuse # 8

Read more : https://www.autocodes.com/p0051.html

Read more : https://www.engine-codes.com/p1168_nissan.html