What does these Code P1170 and P1173 mean?

Answer 1

P1170 - Feedback A/F mixture control (ho2s11)

P1173 - Feedback A/F mixture control (ho2s21)

Break down the code as follows:

"Ho2s" for Oxygen Sensor. The numbers after the "s" refer to locations. In the case of 11, its bank 1 circuit 1. Where as the 21 would refer to bank 2, circuit 1.

example, "ho2s11" we could say: oxygen sensor, bank 1, circuit 1

must be an engineer's answer. all kinds of facts, but it dont make sense. the reason you have those codes is simple. you have air leaks in the vacuum line system, most common is broke plastic "tee's". depending on which engine-2.5 or 2.3, the job can be difficult, or pain in the butt(2.3). parts are really cheap, but labor will break your wallet