Question about Volkswagen Polo
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Posted on Jan 02, 2017
SOURCE: nissan almera 2003
This is on the air/fuel sensor that is mounted in the exhaust manifold right behind the radiator. You will need to remove a heat sheild to see it but you should see the wires coming out of it. Also a spiecial socket is needed to get it out without damaging the wiring.
Posted on Sep 03, 2009
yes and also may make it run rough or lack power. the o2 sensors tell the computer how to make the engine run
Posted on Feb 13, 2010
Testimonial: "u said it would make it hard to start and the other tech said he doesnt think so"
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
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.
Posted on Feb 04, 2011
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