Nissan Repair: check engine light, emission control system, nissan maxima

Question
Hi I have nissan maxima 02 se,I went to auto zone to check the computer. computer showed codes ,po139,po455,p1147.Please tell what is it, and how to fix it. thank you chris.

Answer
Chris,

They are as follows:

P0139 is O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
Replace the oxygen sensor as it is lazy or contaminated.  Should be replaced every fifty thousand miles but no one does this.  Every now and then you get a code when one gets too coated with exhaust product.

P0455   Evaporative Emission Control System Leak Detected (gross leak)  Probably a bad gas cap or it was left loose.  The system checks for pressure and if there is none in the tank it will throw a code.  Also, if a hose is cracked or leaking like a loose clamp.

P1147 ETS Sub Accel Position Sensor 1 Malfunction.  You have drive by wire and this code is telling you that the throttle pedal potentiometer or the throttle motor is throwing a code.  Need a serviec manual for the electrical values to check which one it is.