Air/fuel sensor ( P0031 code ) problem


Asked by Tarani51 Jan 28, 2015 at 02:40 PM about the 2008 Mazda MAZDA2

Question type: Maintenance & Repair

~Mazda 2 2008 1.5 sport.. Code P0031

After removing the air/fuel sensor then having to cut wires to re-install it ( long story), I
keep getting P0031 error code .

There are two black wires, a blue and a white... after cutting wires to screw the sensor
back in and re-joining wires I keep getting P0031 code. I`m convinced I`ve joined the
two black wires the wrong way round but there is no obvious difference between them.
Is it possible I`ve blown a fuse/relay ? I`ve tried reversing black wires around but still
get P0031 code.Long story as to why I removed the sensor but it was working before I
removed it. My user manual is useless and doesnt locate the actual fuse/relay.. not
even sure if it even has one... anyone with an idea ???

5 Answers


I am assuming you mean the heated 02 sensor? did you put in a new one? anyway, once you are sure the wiring is correct use a code scanner and turn off the check engine light. if it doesn't come back then you have fixed the problem. if it does, check for bad wiring spots.

1 people found this helpful.

The oxygen AKA the fuel/air sensor.. not the lambda sensor. It was the original sensor put back in. But there are 2 black wires that are identical in colour so I may have wired both up the wrong way. First thing Im asking is that if there is a fuse/relay that could be shorted by wiring up wrong way, then where is the fuse/relay located.


This is the sensor

1 people found this helpful.

As far as I know, there are no fuses or relays associated with the 02 sensors.

1 people found this helpful.
Best Answer Mark helpful

Well that would narrow it down to just maybe a bad connection... Cheers Mike

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