How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Jay Your Own Question
Jay
Jay, Certified Infiniti Technician
Category: Infiniti
Satisfied Customers: 18724
Experience:  20+years, Nissan and Infiniti experience and currently now working for a Infiniti Dealer
10181755
Type Your Infiniti Question Here...
Jay is online now
A new question is answered every 9 seconds

Currently getting p1273 and p1283 codes. Can't figure out

Customer Question

Currently getting p1273 and p1283 codes. Can't figure out what is causing them.
Submitted: 1 year ago.
Category: Infiniti
Expert:  Jay replied 1 year ago.

Hi, My name is*****'m happy to help you. During our conversation, I may be presenting you with different things to try, and ask you some Questions to get a better understand of the issue so I can answer your question properly. So stick with me to the end, and I am sure we should be able to get this issue resolved for you!

Is this a Sedan or a Coupe?

Customer: replied 1 year ago.
Sedan
Expert:  Jay replied 1 year ago.

Thank you.

These codes are for the Bank 1 & Bank 2 A/F sensors. These are like upper 02 sensors. Did you replace any parts? Did you check fuses?

Customer: replied 1 year ago.
From what I can tell the code is for a lean condition. I decided not to just replace both sensors since it seemed quite odd both banks would set off a code at the same time.
Expert:  Jay replied 1 year ago.

I would agree. That is why I asked if you checked fuses also. Both A/F sensors share the same fuse in the IPDM.

The IPDM is kinda behind the battery. Here is a image of it's location and the fuse location so you can check it.

https://dl.dropboxusercontent.com/u/105565483/g35%20IPDM%20loc%202.jpg

https://dl.dropboxusercontent.com/u/105565483/1d.jpg

Please check that fuse and let me know what you find..

Customer: replied 1 year ago.
Fuse 85 is intact.
Expert:  Jay replied 1 year ago.

Do you have a test light to see if it's getting power?

Expert:  Jay replied 1 year ago.

Also, do you have a cold air intake or anything on the car? Mods?

Customer: replied 1 year ago.
Not with me no...
Customer: replied 1 year ago.
No modifications. Stock car.
Expert:  Jay replied 1 year ago.

I was just reading a bulletin. Try clearing the self learning. To do this, you disconnect the negative battery cable for 15 mins.

Before you do this, have you tried clearing these codes before and they return?

Customer: replied 1 year ago.
I have disconnected the battery, but not for 15 minutes.
Expert:  Jay replied 1 year ago.

Before you try again. Have you cleared the codes and did they return? Did you replace the MAF sensor or anything? K&N air filter?

Customer: replied 1 year ago.
I cleared codes and they return. All stock. No k n.
Expert:  Jay replied 1 year ago.

ok then. Lets try disconnecting the negative battery for 15 mins. See if the codes return after that. That is a hard reset and should clear the self learning. If the self learning is not cleared it can cause the codes to continue to return.

Expert:  Jay replied 1 year ago.

How soon would you say the codes returned after you cleared them?

Customer: replied 1 year ago.
Generally the codes do not return until up to an hour driving. Sometime two or three trips. How can we know if this solves the problem until then?
Expert:  Jay replied 1 year ago.

I can keep this question open if you like so you can drive it and see if it returns after the hard reset

Expert:  Jay replied 1 year ago.

or it doesn't..

Just return back and keep me posted

Customer: replied 1 year ago.
Please keep the question open. I commute 100 miles a day so it will likely return tomorrow if at all. Thanks.
Expert:  Jay replied 1 year ago.

That is fine. I am normally online in the evenings so please return back and let me know how you make out tomorrow.

ok?

Customer: replied 1 year ago.
I definitely will. Thanks Jay.
Expert:  Jay replied 1 year ago.

Your welcome. Talk to you tomorrow.

Customer: replied 1 year ago.
Light is back...
Expert:  Jay replied 1 year ago.

Same two codes?

Do you use Regular Gas?

Customer: replied 1 year ago.
I used either premium or mid grade gas.
Customer: replied 1 year ago.
Same two codes. Usually two of each. This time two p1273 and one p1283.
Expert:  Jay replied 1 year ago.

Well we need a scanner to monitor the A/F sensors voltage, and monitor rear 02 sensor operation. At the same time monitor fuel trim readings.

Do you have a full blown scanner?

Customer: replied 1 year ago.
I do not have a full blown scanner. Just code reader...
Expert:  Jay replied 1 year ago.

There is no way to really see what is going on with a code reader. We need to monitor voltage readings and maybe graph 02 sensor operations to get a idea to see if indeed you have a A/F sensor issue.

You could possibly have 1 that is bad which is making the other compensate for it which is causing the other code as well.

I thought clearing the self learning would help. But at this point a scanner will be required to determine if parts need to be replaced and which ones would need to be replaced.

Customer: replied 1 year ago.
I guess I am out of options here.
Expert:  Jay replied 1 year ago.

There is only so much that can be done with a code reader. Sometimes things require a little more.

If you have any more questions on this, please feel free to ask.

If not, and you're satisfied with my help, please Rate me. That is how I get credit for my work.

I hope I have provided you with Excellent Service.

Thanks Jay!