Check Engine Light Code P0031

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

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

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

JACOBANDNICKOLAS

MECHANIC
109,645 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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