2001 Nissan Sentra ENGINE LIGHT

150,000 MILES • 1.8L • 4 CYL • FWD • AUTOMATIC
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ROMURRAY
  • MEMBER
  • 3 POSTS
I REPLACE MY COMPUTER IN MY CAR TWO WEEKS AGO, REASON THE COMPUTER HAS NOT BEEN WORKING FOR TWO YEARS. ONCE I REPLACE COMPUTER, I RECIEVED CODES FOR MAF SENSOR AND OXGYEN SENSOR FOR BANK 1. I REPLACE MAF SENSOR AND TWO UPPER OXGYEN SENSOR.

NOW COMPUTER SHOWS MIXTURE IS TO RICH.
CAR RUNS ROUGH WHEN STOP, IF YOU PUT CAR IN NUETRAL IT CLEARS UP. WHEN YOU TAKE OFF CAR MOVES SLOW, THEN IT CLEARS UP AND CAR GET POWER BACK.

WANDERING IF PROBLEM COULD BE DOWNWARD OXGYEN SENSORS, OR EGR VALVE. IS THERE A TEST TO DO.

ALSO DO YOU KNOW HOW MANY MILES DOES IT TAKE TO RESET COMPUTER.
Oct 30, 2015 at 8:56 AM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
No, it can't be either of those things. You need to look for something that causes it to get too much fuel.

Look at the fuel pressure possibly too high, fuel pressure regulator leaking into vacuum or a fuel injector not closing.
Oct 30, 2015 at 9:38 PM
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