alright i have a 2005 g35 coupe rev up
the car has a issue going into limb mode wont go over 2500 rpms its throwing codes but im not a 100% sure on what to try first the codes its throwing are
P1274
P1283
P1271
P1274
P1781
P1283
just trying to get some others opinion before i start take things apart and trying to fix them

 

Here is the FSM for your vehicle

https://www.nicoclub.com/service-man...F2005%2Fec.pdf

DTC P1271, P1281 A/F SENSOR 1 PFP:22693
Component Description ABS00A4A
The air fuel ratio (A/F) sensor 1 is a planar dual-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is the combination of a
Nernst concentration cell (sensor cell) with an oxygen-pump cell,
which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range (0.7 <
< air).
The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Nernst concentration cell, where
they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at = 1. Therefore, the A/F sensor 1 is able to
indicate air/fuel ratio by this pumping of current. In addition, a heater
is integrated in the sensor to ensure the required operating tempera-
ture of 700 - 800°C (1,292 - 1,472°F).

DTC P1273, P1283 A/F SENSOR 1
EC-491
C
D
E
F
G
H
I
J
K
L
M
A
EC
Edition: 2004 September 2005 G35 Coupe
DTC P1273, P1283 A/F SENSOR 1 PFP:22693
Component Description ABS00A4O
The air fuel ratio (A/F) sensor 1 is a planar dual-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is the combination of a
Nernst concentration cell (sensor cell) with an oxygen-pump cell,
which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range (0.7 <
< air).
The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Nernst concentration cell, where
they are brought to thermodynamic balance.
An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at = 1. Therefore, the A/F sensor 1 is able to
indicate air/fuel ratio by this pumping of current. In addition, a heater
is integrated in the sensor to ensure the required operating tempera-
ture of 700 - 800°C (1,292 - 1,472°F

What were you doing to your vehicle prior to all of these codes?

 

Well since you're throwing O2 sensor codes for both banks and it's a LOT of codes you may have blown the O2 sensor power circuit (thanks Seymore learn new stuff every day).

Start by checking the IPDM fuses, not sure of the circuit numbers, check the FSM.

https://www.nicoclub.com/infiniti-service-manuals