Hi,

Can someone help with this issue?


1. O2sensor heater circuit low on all four sensors (DTCs are P0031; 0051; 0037; 0057)

I guess there is fuse blown (which is responsible for all four O2 sensors)

Fuel consumption is toooooo high (22 lt/100km, or 10.7 mpg)

So where is located this O2 fuse? I couldn't find it written nowhere.



2. There is DTC stored (P0327) with Knock sensor 1 low circuit.

I guess it's probably dead sensor (but may be wire problem).

Is this common on VQ35 engine?

Thanks everybody in advance!

 

It looks like Fuse 85 (15A) powers the 2 A/F ratio sensors and the 2 o2 Sensors. The fuse is in the IPDM E/R against the firewall just behind the battery. I got this info from the 3405 page 2006 G Coupe shop manual.

As far as the Knock Sensor, it probably just went bad. I have never seen a thread about them being problematic for the VQ's. It's a bitch to get at though, requires pulling both the upper and lower halves of the intake off to get to. Anyway it is definitely not good to have the only knock sensor bad. I've heard of ECU's purposefully running the engine richer, not allowing the torque convertor to lock up and even locking an auto transmission out of overdrive in order to keep excessive engine load from causing pinging.

Good luck!

 

Thanks!
1. Finally, I have found O2 error's nest!!!

It was one 15a fuse at the left of driver's feet!

2. I think you're right, sensor is malfunctioning.