# P0100 and P0325 nissan altima **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [March 31, 2012, 9:14pm UTC](https://community.cartalk.com/t/p0100-and-p0325-nissan-altima/71693 "2012-03-31T21:14:12Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![nat042](https://avatars.discourse-cdn.com/v4/letter/n/85f322/32.png) [@nat042](https://community.cartalk.com/u/nat042)\ **Post date:** [March 31, 2012, 9:14pm UTC](https://community.cartalk.com/t/p0100-and-p0325-nissan-altima/71693/1 "2012-03-31T21:14:12Z")
I replaced the MAF a week ago but the code P0100 is still there. Car runs fine in the highway but I do notice acceleration issues. I got the knock sensor but I cannot find it in my nissan altima (2000). The car shakes while stalling, at a red light, and pretty much as soon as I stop. Putting the car in N will help a bit but won’t stop the shaking. Should I focus on the MAF again or should I keep trying to replace the KS? Any idea of where it is? ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [March 31, 2012, 9:26pm UTC](https://community.cartalk.com/t/p0100-and-p0325-nissan-altima/71693/2 "2012-03-31T21:26:38Z")
If you go to this website [http://www.ehow.com/how\_6599078\_replace-sensor-\_97-nissan-altima.html](http://www.ehow.com/how_6599078_replace-sensor-_97-nissan-altima.html) it has instructions on how to replace the knock sensor on a '97 Altima. Most likely, the procedure and the placement of the sensor are similar on your '00 model. However, I doubt if the knock sensor is the source of your engine stalling problem. Another possibility is that you have a problem with the Idle Air Control (IAC). Are you sure that there are no codes relating to the IAC? Both the MAF code and the Knock Sensor code indicate a potential problem in the circuitry (wiring) for these devices. Have you traced the wires in order to verify that all connections are tight, and the wiring is not damaged? ---
**Author:** ![nat042](https://avatars.discourse-cdn.com/v4/letter/n/85f322/32.png) [@nat042](https://community.cartalk.com/u/nat042)\ **Post date:** [March 31, 2012, 9:33pm UTC](https://community.cartalk.com/t/p0100-and-p0325-nissan-altima/71693/3 "2012-03-31T21:33:02Z")
I have checked the MAF but I’ll look more carefully at the wires. Thanks for the instructions. I’ll take a look and will try to find the KS and its wires this afternoon! ---
**Author:** ![nat042](https://avatars.discourse-cdn.com/v4/letter/n/85f322/32.png) [@nat042](https://community.cartalk.com/u/nat042)\ **Post date:** [April 1, 2012, 5:12am UTC](https://community.cartalk.com/t/p0100-and-p0325-nissan-altima/71693/4 "2012-04-01T05:12:20Z")
the mechanic found the ks, it was broken but it didn’t make a diff with the new one. It turns out the hose connecting the valve w the intake was broken, he changed for $30 and now the cars runs like new!