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Check Engine light

Tiny
JGARCI62
  • MEMBER
  • 2004 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 140,127 MILES
Codes po171 - p1148 - p1272 - p1031. What is the problem? Thank you
Wednesday, May 25th, 2016 AT 7:39 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
These codes indicate there is a lean fuel mixture. Check first for vacuum leaks. If none are present, most likely the air / fuel sensor is bad or there is a wiring issue to this component. Also, there was a technical service bulletin (TSB) on this vehicle which relates to this problem. I do not have access to Nissan's archives, but if you contact a dealer, they should be able to help.
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Wednesday, May 25th, 2016 AT 8:40 PM
Tiny
JGARCI62
  • MEMBER
  • 3 POSTS
Hi, I installed a new one, but without wire connector and I welded the old one oxygen sensor. The heat damaged the sensor or no?
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Thursday, May 26th, 2016 AT 7:37 AM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Possibly yes
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Thursday, May 26th, 2016 AT 4:26 PM
Tiny
JGARCI62
  • MEMBER
  • 3 POSTS
So the heat of welding wires damage the inside of sensor?
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Thursday, May 26th, 2016 AT 4:31 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Use a scanner with a live data feed and you can watch the O2 sensor change voltage, if this is evident it is working ok.
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Friday, May 27th, 2016 AT 5:25 PM

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