What does it mean I need to do ?
Change your UPSTREAM O2 Sensor
SOURCE: Fault code P0133 can't pass inspection.
This code does not always mean the O2 sensor is low, but if u want to replace it here is the info to do that and the part number.
The sensor you want is the one in the exhaust pipe of the engine cylinder bank that has #1 cylinder in it, as you face the engine with the hood open the cylinder bank u want is the rear bank, u will need to jack the car up and get under it to remove the sensor, u may also need a special socket to remove it, the sensor is the one that is before the catalytic converter. part number is:DENSO Part # 2344068
REAR; Before Catalyst
SOURCE: Where is Bank 1 Sensor 2 located on a 2004 Mazda
bank 1 is the bank of cylinders closest to the firewall. the sensor will be located along the exhuast from that side after the catylitic converter
SOURCE: I have a 2000 Mazda
Most likely a bad O2 sensor. Search the internet for O2 sensor info for how
they work and more detail on heated O2 sensors. Sensor 1 means upstream
or in the manifold. In front of the catylytic converter. There is what
appears to be a small catylytic converter at the very end of the exhaust
manifolds in addition to the one that looks like a normal size
converter. Sensor one is at the back of the exhaust manifold between the
engine and the manifold. Reference source: http://www.aa1car.com/library/o2sensor.htm
Or...
The
heater circuit can be checked with a test light connected to ground. ( a
test light is an ice pick looking tool with a clear handle with a 12
volt bulb inside and a ware with a clip to connect to ground, the light
will light as the tip is touched to anything powered up with 12 volts
and sometimes a little more and a whole lot less) Find the oxygen
sensors ( their screwed into the exhaust pipes) Disconnect the
electrical connectors and connect the test light to ground, with the key
on test the wires in the plug connected to the vehicle. one of them should
light the light, if it does reconnect it and test the rest of the
sensors, recalling which wire was live. ( most are white or gray but
they vary some). If all the sensors have power it's not the power but
the sensor failed. with an ohm meter test the sensor for the wire that
was hot to the other wire that is the same color if the snensor is open (
no circuit ) you have found the bad sensor. If you can't find power
going to any of the sensors. Check the fuse boxes for blown fuses (
check them all with a test light) If you find a blown fuse replace it
but go back to the wiring that connects to the sensors and you'll find
someplace where the wire melted to the exhaust pipes and shorted out,
blowing the fuse. The sensors short out too but not very often.
P0134....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135....O2 Sensor Heater Circuit (Bank 1 Sensor 1) heater in the O2 sensor has packed up first sensor before the cat
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