SOURCE: vehicle speed sensor
You will have to get to it probably from under the car it will be located just to the right of the driver's side axle
SOURCE: o2 sensors on a 99 mercury cougar v6
I just got done replacing the O2 sensors in my 99 Cougar due to throwing a P0135 malfunction code. There's 3. Facing the engine there's one in the front coming off of the front header, which is easy to get to. Another more tricky one if between the engine and the fire wall on the rear header pipe. The third is under the vehicle behind the transmission pan on top of the exhaust. In order to replace the O2 sensor near the fire wall you will need to remove the 4 retaining bolts for the ECM module and move it out of the way. Additionally you will need to remove the 2 retaining nuts for a wiring harness that is seated below the ECM module. Pay close attention to the connectors because the front and under vehicle O2 sensors have round connectors the one near the firewall has a squared connector. I was able to replace all 3 by myself in approximately 35 minutes. If your throwing a O2 heater malfunction code it is most likely going to be the sensor near the firewall. make sure that you know someone with a code reader so the code can be cleared. If you're do for an emmissions inspection be sure to put at least 40 miles on the new O2 sensor with different types of driving (e.g. highway, coasting, decellerated turns and rapid acceleration). Gotta love project cars for your kids!!
SOURCE: CAR WANT START, BATTERY WANT HOLD CHARGE AFTER JUMP OFF
i had to do this to my wifes 99 cougar. if you're not a lil car savvy, then your best bet is take it to a mechanic. I found the instructions, on autozones website. 1st you gotta take off front passenger tire, remove the whole assembly including the half shaft. (this car is really a pain to work on) Thats not even all of it, thats just to see the alternator from underneath. I got everything except that damn last bolt holding the alternator in, so i had to put it back together, get it towed to a friends shop and let him finish it for me. So far I hate working on this car, if its not something above the motor, then its a pain cuz they decided to put that big *** 2.5 motor in the small *** car!! But if you really want to do it yourself, I recommend autozone, they have detailed info on how to do it, plus some tools, you need to rent if you don't have em already!! Good luck, you'll definately need it!!
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