This is a little more technical then what I’m used to in a while. My 2005 Infiniti G35x with 71k has been having a on and off CEL for the past month. P1283- Air fuel ratio sensor 1 lean shift- bank2.
It comes and goes, like I can drive 100 miles and it would never light up and I can go 15 miles and its always on. Car runs great. MPG seems to drop about .5 MPG but then again its winter blend fuel time. I didn’t see the CEL for almost 2 tanks of gas (300 miles per tank), then I filled up with a tank of Sam’s club gas. Within 10 miles, it was on with the same fault. And it would repeat say every 15-25 miles. I ran down that tank instantly and got to Mobil. Full tanked it on 93 octane, it was good for the first 100 miles and now it’s back again. Here is a kicker, it will set the readiness code almost everytime! So I can still pass emissions in my state pending on time I take it in.
I have an android phone with the torque app, so I set it to graph the both front 02 sensors. First thing I see is bank 1 being at 0.3volts and bank2 being at 0.5v. I take it for a drive to watch the voltage to see if I have one of those LAZY sensors. Aside from the difference in voltage I noticed bank 2 would spike up more than bank 1 and in most cases it would hit .9-1.2v and the most bank 1 would hit is .7v, this is me gunning it and letting off.
I assume me letting off triggers the lean condition and the higher voltage is leaner and lower voltage is richer.
Would it be safe to say I have a soon to be dead bank2 sensor? Is there any testing I can or should do? I always thought .5v was a good idle voltage and not .3v
It comes and goes, like I can drive 100 miles and it would never light up and I can go 15 miles and its always on. Car runs great. MPG seems to drop about .5 MPG but then again its winter blend fuel time. I didn’t see the CEL for almost 2 tanks of gas (300 miles per tank), then I filled up with a tank of Sam’s club gas. Within 10 miles, it was on with the same fault. And it would repeat say every 15-25 miles. I ran down that tank instantly and got to Mobil. Full tanked it on 93 octane, it was good for the first 100 miles and now it’s back again. Here is a kicker, it will set the readiness code almost everytime! So I can still pass emissions in my state pending on time I take it in.
I have an android phone with the torque app, so I set it to graph the both front 02 sensors. First thing I see is bank 1 being at 0.3volts and bank2 being at 0.5v. I take it for a drive to watch the voltage to see if I have one of those LAZY sensors. Aside from the difference in voltage I noticed bank 2 would spike up more than bank 1 and in most cases it would hit .9-1.2v and the most bank 1 would hit is .7v, this is me gunning it and letting off.
I assume me letting off triggers the lean condition and the higher voltage is leaner and lower voltage is richer.
Would it be safe to say I have a soon to be dead bank2 sensor? Is there any testing I can or should do? I always thought .5v was a good idle voltage and not .3v