Check Engine Light Code P0031

Tiny
BMAC168
  • MEMBER
  • 2003 TOYOTA CAMRY
  • 2.4L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 42,000 MILES
The check engine light came on and came back with the code p0031. I replaced the O2 sensor, bank 1 sensor 1, but the code still came back and the check engine light will not go away.
Wednesday, June 29th, 2016 AT 3:40 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening.

What kind of sensor did you use? It is a special sensor called an air fuel ratio sensor. If a standard sensor is used, it will not work.

Roy
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Wednesday, June 29th, 2016 AT 6:17 PM
Tiny
BMAC168
  • MEMBER
  • 2 POSTS
Yes, I replaced it with the air fuel ratio sensor. I bought it from a Toyota parts store with part number 89467-06030. It is the oem sensor, so I do not understand why the code will not go away. I cleared it many times, but the check engine light and the same code will pop back up within a minute.
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Thursday, June 30th, 2016 AT 1:28 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Are there any wiring issues to the sensor? There are many things that could cause the problem. For example, a bad connection, poor ground, bank 1 sensor 1 circuit fuse, or even a bad ECM. What you need to do is get your hands on a real time scanner which will allow you to watch how the sensor is reacting. That way you will know if there is even a signal from it. Please keep in mind, this is a heated sensor. The code indicates the heater component is experiencing low voltage. To me, that sounds like a connection problem or damaged wiring. Take a look at the pic I found.
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Thursday, June 30th, 2016 AT 8:05 PM

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