long story short...well sorta

2 months ago my car fell into limp mode (it was bucking violently, thought the tranny was gonna drop out). Anyway, there was no CEL at the time which was surprising. Mechanic checked for fault codes and found the oxygen sensor needed replacing. Why no CEL? Any case, he changed the sensor and the car has been ok until today.

The car went into limp mode No CEL, again!! So, I got myself a bluetooth ODB scanner and found code P010B pop up. Google tells me its the INFINITI - Mass Air Flow Circuit Range/Performance Bank 2.

Can someone tell me what bank 2 means? Does this mean I need to replace the part?

Any help appreciated, I'm trying to do without a mechanic.

forgot to mention, its a 2009 G37X Sedan Auto

 

usually bank 2 means passanger side. at least it did for my old g35.

 

good to know. i just took the car out again to chart the MAF voltage and it was fine, no limp mode. very frustrating...

 

Clean your maf sensors, reset your ecu and cross your fingers.

 

Having the same issue with my '09 G37x.
Cleaned my MAF sensors and reset my ECU.
Problem still persists.

Only happens during the winter.

 

The code "P010B" means there is a large difference between bank 1 MAF output and bank 2 MAF output, where bank 2 MAF is suspected to be out of range.

Try this:
-Unplug and plug in the MAFs on both banks.
-Check the MAF wires for any unusual kinks, cuts or repairs.
-OBD Fusion (phone app & ELM 327 dongle) will give you bank 1 and 2 MAF voltage.


Do you have the factory air box?

 

it's been 3 weeks and so far hasn't happened again.

what i did was;
- cleaned the MAFs
- cleaned the throttle bodies
- made sure the wires and connectors were ok
- swapped the MAFs (left <-> right)

I also changed the battery since its been struggling to start.

The voltages were reading just fine on the ODB app



wondering if water got on the maf and threw it off...

edit: yes its a factory air box

 

I think that was the right move. It it happens again (on the other side), i'd replace the sensor. You can get the OEM Hitachi sensor for about $80

 

I was in limp mode, had service engine light . They told me it was the battery...

 

service light never came on for me. Did it read any codes?

 

Nah , didn't see any codes ? I went to the dealership since I'm still under warranty

 

My 2013 g37 is having same issues. It will lose power when driving. I will turn it off for about 30 seconds turn it back on and have full power. I had the p010 and p010b CEL. I replaced the mafs, throttle bodys, downstream 02 sensors, spark plugs. Took it to the dealership and had them reprogram the ecu based on the TSB bulletin.

Nothing has worked. Has anyone had a solution to this?

Thanks

Luke

 

The P010B is MAF2 voltages are incorrect this can happen over time and cleaning might not solve it.

I built a small test jig to test 5v sensors and found:

Top P010B sensors- These were .2v difference in the log and this outside of the car.
Bottom are an old pair I found that were "good".

The ones I put on the car both measured 1v at the same spot on the fan and fixed my problem of P010B

This was all done after cleaning them as well.

 

Thanks for the reply....just so I'm following cleaning them fixed your issue?

 

im having the same problem would you mind explaining how you tested the 5v on the mafs? I have two sets of mafs and both keep throwing the code so I’m thinking I might have to check what you did but I’m not really good with electrical diagnostics.