Question about 1999 Mercury Cougar

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How much should it cost to install 2 o2 sensors in a 99 mercury cougar v6

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About 170 dollars

Posted on Oct 19, 2010

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Posted on Jan 02, 2017

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My # 30 fuse keeps blowing... 99 Mercury Cougar


If it is a 7.5 amp fuse, it powers the charge warning light in the cluster and applies voltage to the alternator to make it charge.
You will need someone to trace that circuit and look for a short to ground. It may be in the cluster or in the harness.
Something else besides the fuse is making the car not start.

Jul 31, 2012 | 1999 Mercury Cougar

1 Answer

I have a 2001 Mercury Cougar with the 2.0 that needs a new catalytic converter. The current conerter has 2 O2 sensors, but I can only seem to find new converters with 1 O2 port. Does anyone know where I...


A direct fit converter for your car is is available from Eastern Catalytic. However a reputable muffler shop should be able to install a threaded port for the 02 sensor if you want to go that route. Call around, get prices, and from that you can make a decision.
Hope this helps.

Jul 01, 2011 | 2001 Mercury Cougar

1 Answer

Labor cost on o2 sensor mercury Milan 2007 v6 premier


You shouldn't pay more than $40 for the installation of an o2 sensor. It is only a 15 minute job at max. Good Luck!

May 11, 2011 | 2007 Mercury Milan V6 AWD Sedan

1 Answer

99 cougar 2.5 v6..starting problems


take your car to autozone. It might be your alternator. It is better if you take off the alternator to have it tested, just incase it is a parasitic leak. This happened to my navigator 2 days ago. It was wierd because it ran fine when it was warm outside. But kept killing by battery when it was cold!

Mar 05, 2010 | 1999 Mercury Cougar

1 Answer

Why is 99 mercury cougar getting bad gas milage"It seems to be getting worse.Less milage than my 99 ranger4x4.new plugs,oil change about 2 months ago.would a new O2 sensor help?


Try new plugs, wires, fuel filter, air filter, pcv valve, and if its still not too
good,, do the 02 sensors..

Have a good day !

Oct 24, 2009 | 1999 Mercury Cougar

3 Answers

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!!

Mar 30, 2009 | 1999 Mercury Cougar

1 Answer

More 99 cougar problems


there is a fuse for the o2 heaters if one of the sensors blew the fuse they will all be out

Feb 14, 2009 | 1999 Mercury Cougar

1 Answer

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

Feb 01, 2009 | 2000 Mercury Cougar

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