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look under truck and follow exhaust system from front towards rear the o2 sensor 2 is the sensor after he cat converter it looks like a tube with a wire connection mounted on top of exhaust pipe disconnect connection and unscrew sensor replace and reconnect
You have an incorrect O2 sensor. It will not work. A correct sensor will plug in without any problem. If you bought the sensor at a parts store, you need to return it, and exchange it for the right part.
Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.
You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness. Causes
A code P0100 may mean one or more of the following:
* The MAF may be disconnected, or a wiring connection may be bad. * The MAF sensor may be faulty.
Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires. * Unplug and reconnect the MAF wiring harness a few times to clear the contacts. * Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information). * Replace the MAF sensor.
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Follow the exhaust pipe to beyond the catalytic converter. The "rear" or down stream O2 sensor is usually on top of pipe behind the converter. Follow the wire from it to its disconnect plug andf unplug it. Use the correct size open end wrench to remove the sensor. Reverse to istall replacement. You really don't need a diagram - just your mark 1 eyeballs.
your o2 sensor hooks into your exhaust system. where it goes into the exhaust their will be a wire connector somewhere close by unless it melted away or is gone you wont see where it goes into the computer