2004 nissan sentra stalling at idle or at a stop.

God bless you my brothers and sisters.
I got this 04 sentra with a stalling problem the first time it got here it had the same codes. All i did was pull code for him and I was asked that code should he worry about i said we need too look at p1271 and p0507. Customer went too a junk yard and got a A/F sensor and i installed it, it did not fix his problem. At this time i did find a vac. leak I fixed it and the stalling was more frequent . Question here is can a bad A/F sensor cause the car to stall ? How do i check the A/F sensor ? Where should I start?
Thank you for your help

Hi Gilbert,
I am no way the caliber of guys like Noah, Ben, Tyler and several others...so take my advice with a grain of salt. To address the stalling problem first, I would check to see if the throttle body and the MAF sensor needs cleaning. Then I would focus on that P0340 (CMP circuit) first, checking the power and ground and also scope it. Also check the battery engine grounds ( and possibly even check the battery itself). Which engine is in this? the 1.8 or the 2.5?

God bless you my brothers and sisters.

Rockp2 thank you for your respond, this is a 1.8L the t/b is clean and so is the maf sensor. I did fined a bad wire on the T/B and also one at the A/F sensor fixed them both but no change. I'm still looking at wire harness for bad wires.

God bless you my brothers and sisters.
Monde thank you for your respond i put a throttle form the juck yard in fact I put two. The car is still doing the same thing the relearn with the scanner dose not take the car turns off. The car ran out of gas I will keep checking tomorrow. Thank you for your help.

Check the idle air control valve id say and clear the codes??

God bless you my brother's and sister's.
Ninjaxchicken thank you for your response this is a drive by wire system the iac has been replaced with the T/B. After the car warms up
the idle drops and iac kicks in. In other words it surges till it shuts off when cold the car idles high at about 1000 RPM. Question how long dose this system have to hold fuel pressure after it shuts down?

God bless you my brothers and sisters.
Today I chased the MAF sensor wires after i did repairs. From the PCM to the plug i had continuity and when I start the car I get thees readings on the blu/red 1.115 v, red/wht 5.16 v, bk/wht 94.9mv,red/grn 14.25 and on the yel/grn 3.165v can anyone tell me if thees are good and I need to replace the sensor?

God bless you my brothers and sisters.
Mr. Monde thank you brother for your respond. Brother how can I tell if it's a ground that wire go's to the pcm and it don't say. Is it grounded in the pcm?

God bless you my brothers and sister's
Thank you Monde, so the yellow and green is the 5v for the temp sensor. So do you think I should replace the maf sensor, will a bad cause the A/F sensor to read rich?

God bless you my brothers and sister.
Hey Monde I checked the blu/red wire and it didn't rise when i rev.the engine. I called a bad maf and replaced it and it fixed the problem.
Thank you all for your help.

gilbert wrote: God bless you my brothers and sisters.
I got this 04 sentra with a stalling problem the first time it got here it had the same codes. All i did was pull code for him and I was asked that code should he worry about i said we need too look at p1271 and p0507. Customer went too a junk yard and got a A/F sensor and i installed it, it did not fix his problem. At this time i did find a vac. leak I fixed it and the stalling was more frequent . Question here is can a bad A/F sensor cause the car to stall ? How do i check the A/F sensor ? Where should I start?

Thank you for your help