2000 QX4 CEL

[paulfromcbad]

hi, i am new to the forum, and my name is paul. i drive a jeep, but i am trying to help out family. they drive a infiniti QX4. its a 2000. the code is P0171. it came back with a back with a bunchof different possibilites. how would i be able to narrow it down? thanks for the help, and if this is the wrong section let me know. i did some more research and found, P0171 Fuel System Lean, Bank 1. i origionally tried the Q45, but then was suggested to try here. I was also suggested that the fuel filter might need replacing. is there anything else that could be the culprit? thanks.

[fueler]

Whats up Paul. I'm from San Diego, CLAIREMONT to be exact. Wish I could help ya, do you know if the QX4 has the VG 3.3 engine or the VQ 3.5?? It's probably 3.5 , those are notorious for O2 sensor problems, I doubt its a dirty MAf sensor unless u got a K&N air filter

[nissandoms47]

If its a 2000 it has the 3.3 most likely the pre cat 02 sensor has gone bad. But I would replace both of the bank 1 sensors just to be safe. (passenger side sensors)

[AJRK]

When my 2001 QX4 had a P0171 code, the MAF needed to be replaced. Good luck.