Hi Guys,

I'm looking for some help regarding small issue on my 2007 VQ35HR (I don't know if my car's mount with the 234-9072 Denso O2 sensor or 234-9036 one's, but it's no the current issue).

Does someone can confirm me the following figures from the primary O2 sensors voltage with an ODB scan tool.

O2 sensor B1-S1 voltage,
O2 sensor B2-S1 voltage.
At iddle, and 2000 RPM.

The issue is that my O2 sensor B1-S1 voltage is different that O2 sensor B2-S1 voltage:

For exemple when I switch on the car: ~0.450mv for O2 sensor B1-S1 and ~0.800mV for O2 sensor B2-S1 voltage, the difference remain at each RPM level.

And I assume that those voltages should be closers as possible ?

Thank you very much for your help and for your information.

 

Any CEL? Does it go away after the car warms up? I remember mine being off, but I'm not sure it was by that much. I'll check it on my way to school tomorrow and let you know.

 

No cel, and the difference remain also after warm-up... Thanks for your help

 

They should be near exact. How many miles are on the car?

 

That what I thinked... 42000km, so 26000 miles.

 

No one can check this with his Scan data tool ?

 

If someone can check, to comapre it will be very helpfull

 

I know this is 4 years old... but you're active as of 5 hours ago.... did you ever resolve this issue. Mine is doing this same thing. With berk hfc and a new b2s1sensor since the resistor failed when installing hfc. Follow up is appreciated

 

Honestly, I think there is no issue on that... It's part of the VQ35HR and ECU operating.

I still have the same value, without any trouble and CEL, so no worries on that !

I guess the ECU work on two different ways to monitor the AFR, tha's all.

 

Same thing guys! 2008 55k km, thought it is bad

 

Hi,

I have exactly the same values with my HR.

0.45V on bank 1
0.85V on bank 2

Strange but we have all the same values, so it must be normal....

 

Indeed, keep in mind that the voltage is managed by the ECU, maybe the two work on a different range...

 

Hi Everyone, I am new to this community, so apologies if I post in the wrong place.
- I got P2A03 code and I replaced the A/F sensor (Bank2 sensor 1) with Germban (Part number: 234-9072)
- I cleared the code, but a week later, the engine light came again. It was P2A03 code again.
- I checked with bluedriver app, and it seems like the O2 sensor is giving voltage reading. What's odd is the sensor1 in both bank 2 and bank1 are not looking similar. My assumption is they should be similar? I'm wondering what's potentially wrong here, given I already replaced the sensor with the correct part number.




If this helps, I want to add that, I measured overall signals as well, Bank1:
- VBATT = 13.96V
- AF+1 = 2.244V
- AF-1= 1.846V
- AF+1 to AF-1 = 0.398V
- AFH to GND (PWM) = 6.75V

Bank2 (where A/F1 fails)
- VBATT = 13.96
- AF+2 = 2.23V
- AF-2 = 1.882V
- AF+2 to AF-2 = 0.357V
- AFH to GND (PWM) = 5.63V

Please help, I still get the engine code error, and I'm running out of ideas