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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
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.
You state that car makes a loud noise when driving. Do you notice the sound more when you accelerate? If yes, then it could be either the exhaust manifold gasket or the donut gasket. The donut gasket is where the exhaust pipe connects to the exhaust manifold.
i think there is only one, it is connected to the exhaust manifold just before the cat, if you check all away allong you might find another just before the rear muffler?silencer/back box, the first one is called the heated oxygen sensor (ho2s) but i think there is only one...hope this helps
under the intake manifold(rear of the engine). To access, the manifold must be removed. You may also see it from under the vehicle, at the rear of the engine, above the exhaust. It may be possible to access with slim arms, I personally could not. Hopefully this helpd
I hope that you had the proper weight oil installed, at your oil change. If your oil is up to the proper level, and it's rattling ,this is VERY bad. White smoke usually means steam in the exhaust, and that means a blown head gasket. Check your coolant level. I wouldn't drive it anymore......until someone knowledgeable can diagnose it!!!!!
Is the check engine light on with oxygen sensor codes?
If there are no problems with it leave it alone. i have seen factory sensors working good with over 300k miles on them. I recommend using dealer tune parts. at least NGK plugs. I have found misfire problems with aftermarket tune parts on several occasions.
there could be 2 oxygen sensors and they will be in the exhaustmanifold or the catalytic converter or the "A" pipe between the manifold and catalytic converter. if you have the correct tools you can do it. sometimes requires special tools and rarely they are seized in the exhaust manifold and damage the manifold than it has to be replaced.