Just got this fault.



Car is a 2005 G35x sedan with 70k I have HFC cats with anti-foulers that were install about 3 months back by PX. Never had a CEL for anything. I have Uprev on a custom map. New OEM plugs installed about a month ago.


I was running a custom map when i got the CEL, then i cleared it out and ran it on a STOCK map. Still came back. So pretty much eliminated my tune. Unless i should flash the "back to stock" file to really eliminate my tune out of this.


Common sense tells me to start by replacing my front o2 sensor.

http://engine-codes.com/p1283_nissan.html

But i googled around and found a lot of nissan/infniti people with this problem replaced their o2 sensor and it didn't solve it. So i dont really want to jump to that right off the bat. Anyone have this issue and solved it? I couldn't find a case where someone online posted they solved it.

 

Its because you have HFC i had the same code on my car when i put test pipes. Do you have the full osiris tuner version, or just standard? If you have the tuner just turn the code off im getting the correct AFRs now that i tuned it but i just turned the code off.

 

i have this code at times, well actually mines is the p1273 so the other bank. but tuned on osiris and every once in a while the CEL will pop on for a lil bit then turn itself back off. during the time CEL is on it doesn't idle right at start but once warm is fine. think my ignition timing is too far advanced for the heat and humidity of summer down where i live. not running anti-foulers on berk hfc's.

 

I have the tuner. I could block out that fault but i do need to pass emissions every other year.

If i got both bank faults then yes i would easily blame the HFC or tune. But since its one... i'm considering o2 sensor.

 

I have the same issue on my s/c boosted car. I'm running ART test pipes. I'm having my tuner eliminate this code so it doesn't pop up anymore. My car runs the same with it on or off.

Although my a/f gauge is acting funny by jumping around 1-2 pts. I can't even have a steady a/f at idle anymore it jumps around from 12.7 to 14.5 but once in open loop it is where it should be.

 

datalog and email it to me with your rom, I'll look over it and if the cars running alright then I'd recommend just turning it off

 

I emailed you a while back with this. I should have time to finally datalog this weekend.

car is running good and strong AFAIK.

 

Just got your email, lets tweak her some and see how it goes

 

I've been getting the same code on and off for about the past year. It seems to come and go about every 300 miles and usually turns on after about 10 miles of driving, until after my last track day. Now it comes on in 2 or 3 miles. Still idles like a rock and haven't seen any change in fuel economy either. I've also done two track days consisting of 6 20 minute sessions and the SES light never tripped. I'm running a Stillen intake, Stillen Z-tube, APS Tall Boy plenum, Stillen headers, Berk HFCs using the non-foulers, and Borla exhaust. My current theory is that I'm running a touch on the lean side at lower RPMs, but OK at the high end. I hoping a tune on Osiris can kill the light. I'll be interested in what you have to say Seymore.

 

If you've got headers I can guarantee that you're running lean, probably dangerously. The stock tune isn't even that good, and when you put those kinds of mods on the stock ecu is simply overwhelmed.. idling and at partial throttl it will be fine, but at full throttle the amount of air flowing through there is just too much to handle.. I wouldn't be surprised if you were hitting 14.5-15:1 AFR's at full throttle.

As for the tune fixing the code, maybe yes and maybe no. The codes don't always come on because its running rich/lean, they're more of an indicator that something is significantly different than what the ecu's expecting. That could be a lean condition, but it could also be just too much exhaust flow tripping the sensor out. The first step is to fix the AFR with the ECU reflash, if the code persists then deactivate it in the tune.

Any time the CEL is on the ecu will run in a semi limp mode, it thinks there's something wrong so it defaults to a safety map

 

Thanks for the info. I ran the headers and HFCs for about a year and a half with no SES problems. If the ECU was running in a safety mode when I was at the track, that could explain why I felt a bit slower and I drank a bit more fuel than the previous time.

 

Its also possible that the HFC's failed recently, I've seen them last 4,000 miles or 50,000 miles... kind of a crap shoot

 

Also a posibility. 90% of the time I only get the P1283, but sometimes I get the P1273 code at the same time.

 

I know i was around there with my AFRs the tune fixed it right up though!