Velometer operation explain the actual sensor head

you kinda answered your own question, lol. being that the head lamp wont turn on means that the sensor is simply out and can be fixed by simply getting a new sensor. the actual light should be fine.

should be on side of actual throttle body attached to throttle shaft with two retaining screws either torx head,or possibly phillips head screw.unplug sensor and remove screws.install in reverse order.

The O2 sensor is primarily to help with emissions. It measures the amount of oxygen in the exhaust enabling adjusting the fuel air ratio to make sure the amount of oxygen is just right to burn up all of the fuel. This perfect scenario is what is needed to enable the catalytic converter to operate efficiently. 3-Way catalytic converters actually work amazingly when provided exhaust with no unburned hydrocarbons and no excess oxygen. This is what is called a closed loop solution. The vehicle will also be equipped with an open loop solution - a solution that does not use the O2 sensors. This may have a minor effect on fuel mileage but the vehicle should run without much trouble.

You need to remove the ADF, the lower scanner, the output tray, both side covers, the ink loader assembly. The rest gets fairly intricate, if you can provide your e-mail I will be happy to e-mail you the instructions with diagrams.

What about "throttle position sensor"? I broke my crystal ball and I'm not real good at "guessing", so you will have to actually explain what it is you want help with.

The first step is to determine whether the engine is actually running cold or if the engine computer just "thinks" it is. Your temperature gauge is controlled by the engine computer. I use an infrared thermometer directed at the base of the Engine Coolant Temp (ECT) sensor while watching the ECT sensor data on the computer to see if they match. This should be done before replacing ANY parts. You need to make sure that the ECT is not "lying" to your engine computer. Your vehicle is also equipped with a Cylinder Head Temperature (CHT) sensor to measure the the temperature at the cylinder head. (The ECT is located in the intake manifold.) These should read within 5 or 6 degrees from each other at all times. If it is determined that the sensors are all functioning properly, and the engine actually is running cold, then I would recommend getting a thermostat from the dealer. (I have had a few problems with aftermarket thermostats.)

Battery issue?

Well that statement is giving you the solution.

If you need further assistance you need to explain the actual issue that is giving you this message so we can discuss how to solve it.

Check out you tube, type in knock sensor replacement, will offer a video, lot easier than me trying to explain it to you.
Hope this helps.

Might not be anything wrong with the sensor. Look for an intake air leak, blown head gasket, ignition problems, compression, etc. Many times electrical or mechanical problems cause the sensors to read erratically. Also, try putting the front sensor in the rear pipe and the rear sensor in the front. This will tell if it really is the sensor or something else.