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O2 sensors on a 02 mercury cougar v6 - 2002 Mercury Cougar

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Posted on Jan 02, 2017

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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!!

Posted on Apr 04, 2009

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SOURCE: how much should it cost

about 170 dollars

Posted on Oct 19, 2010

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Dec 13, 2015 | 1999 Mercury Cougar

1 Answer

How to lower co readings on 1994 mercury cougar v6?


You again? :P

Put them back where they belong, up stream and down stream. If that doesn't fix it, then you have other problems with the running of the engine which need to be addressed.
There are a few other things you can do via fuel, etc. to lower it that little bit. Contact the shop in Denver to address those issues. Visit powerstrokedenver.com for the shop number.

Jun 20, 2014 | 1994 Mercury Cougar

1 Answer

Where is the oxygen sensor on 06 ford explorer v6


Explorer requires 4 O2 sensors in total. Two are upstream, i.e. above the catalytic converter and two are downstream i.e. below catalytic converter. Simply locate these sensors by following the exhaust line from the engine towards the catalytic converter and after it.

Apr 14, 2013 | 1997 Mercury Cougar XR7

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

97 cougar new cats 4 new 02 sensor but still getting bad o2 codes


What codes?

Have you not looked them up?

Most O2 Issues, are vacuum leaks, if the sensors
are okey

Jun 27, 2011 | 1997 Mercury Cougar XR7

1 Answer

I have a 2002 6 cyl Mercury Cougar. I need to replace the o2 sensor... How would I do that?


The o2 sensor is located one top of the air intake pipe. All that you have to do is take the bolts out and unplug the o2 sensor and replace it. I hope my advise helps you.

Aug 10, 2010 | 2002 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

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