The engine light is on sometimes and we put a diagnostic tester in the car and it says the code is PO131, 02 sensor low, voltage bank 1, and sensor 1. What does it mean.
1.3 is m13a? actual.
non USA car? NO year on car?
ok P013x codes are like nails, common as .....
it means just this.
The actual sensor part is stuck at 0volts. (not heater fail)
the sensor is bad.
the wires are cut, melted or wrecked there.
there is and exhaust leak near it, sucking air,
or the engine fueling is so lean the sensor is stuck low.
you never said engine runs perfectly ? does it?
if yes, then the 02 is bad, or wires to it are bad.
the mech finds this by LOOKING at it, and then scanning it live
and forces engine rich (ask) and sees if its alive.
if dead, he then looks for exhaust leaks THERE.
if all that checks out, he then replaces IT.
B1S1 replaced.
S1 is front
I will try to compress the over view of modern car motor with its monitors and controls.
There are sensors all over the car that tell the "adding Machine " (CPU) what sums to add to the bottom line. Which is the engine state.
what they check is the amount of unburnt gases and the amount of oxygen and carbon dioxide present in the intake and exhaust.
there are screwed into the intake tube or manifold and on the exhaust pipe in front of the catalytic converter and behind the
converter So there are two CO2 sensors which represent a varying
conductivity to the cpu. . 5 volts sent down the wire to the sensor comes back as 3.5 volt if the amount of pollutant is within limits but 5 volts if it is not. (example)
your oxygen sensor needs to be replaced and can be gotten for between 30 and 60 dollars . you should be able to remove and replace it quickly . the only hassle being it is under the car . so either drive it over a pit or use jackstands . Poor mans method is to drive car up one side on the curb other on the street will normally give you enough room .
remove the wire and guard then unscrew it use wd40 as it is. dry from heat . replace and reconnect and now you will get better mileage as the mixture of the gas air for your car will be more accurate .
the voltage and amperage from the present one is out of limits .
Also expect to change the other one soon .
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