Hi I've had my 99 Altima for 5 years now and it as 120K miles, I went to autozone yesterday to get the free check engine light diagnostic (which has been turning on and off for the past several months) and the following codes came up.
p1448 (i have to go to the dealer to find out what this is)
p0141-O2 (bank 1 sensor 2)
p0440 (emission leak)
p0325 (knock sensor)
Do anyone have any suggestions what causes this or what I could do to fix it? My mechanic says that the knock sensor popping up is common in altimas, but in reading other threads it appears that cleaning/replacing the MAFS might eliminate the knock sensor from appearing in another diagnostic reading. Can someone helpt w/ the other issues? I don't want to appear like a complete bone head when my mechanic is talking to me.
You need to use the search function around here. All those stuff has been cover quite extensively,
P1448 - is the EVAP control valve. Possibly water or rust damage.
P0141 - Rear O2 heater control. Maybe sensor or harness problem.
P0440 - EVAP leak, possibly gas cap.
P0325 - Infamous knock sensor is likely bad.
Knock sensor. Buy the new sensor. most likely it is faulty.
Evap canister is probably your canister is rusted and broken. You will have to buy a new canister. Search on this forum there is lot of info already. There are exact details of the work needed to be performed
I get the exact same codes as Jubilee99Altima's. The mechanics said the purge valve should be replaced with $189 for parts and $35 for labor. I'm not sure if this could solve the knock sensor and O2 sensor problems.
The symptom, other than the SEL, of my Altima 98 GXE is every time when I open the gas cap, I can hear a sound like some air is entering or leaving the tank, like the air pressure inside is very different than outside, especially after the full tank of gas is used up. Then after I open the gas cap, the car is hard to be started, it takes 5-10 seconds. But it has no problem to start if I don't open the cap.
From the symptom above, can anybody help me to see if the purge valve is the reason?
Also, does anybody know where to buy the purge valve with a lower price?
Be leery whenever you get a whole bunch of codes pulled all at once. Many times it is just a common fuse or power problem that trips a boatload of them. And sometimes we accidentally trip them. So if after reset you keep getting the same codes, and you have ascertain they don't share common power, then troubleshooting them one at a time. Start with the easiest in case it leads you down a common failure point.
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