http://www.iequus.com/obd_def.asp

I have Maxima 2000. The car lost his power extremely.
Everyone thought it was oxygen sensor(but which one?)
It was Mass Air Flow Sensor. Easy to replace. 15 minutes.
Easy to get. Dealer has for $100.00.
So remember check that out. The trouble code I had was P171.
System too lean bank 1.
Also I had P0141 - O2 Heater Circuit (Bank 1, Sensor 2).
BUT IT WAS MAF SENSOR NOT OXYGEN SENSOR.

I saved myself 500 bucks.

Woohoo.

 

15 minutes? Can you post how you did it? Thanks.

 

Yup had the P0171 code too. Bought the MAF from Dave B for $90, included shipping, and had my mechanic install for 15 bucks. Took him 10 minutes, coulda done it myself. Got my power back