Question about 2003 Mercury Mountaineer

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Where are the oxygen sensor located on a 2003 mercury mountaineer v8?

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ALL O2 Sensors are in the Exhaust Converters

Older vehicles in the pipe before it & on some foreign
veh in the exhaust manifold

I guess you haven't been under there to even look

Change the front 2 at 100,000 miles

Posted on May 20, 2011

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Posted on Jan 02, 2017

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2003 mercury mountaineer keep blow fuse 41 and will not trune over


F1.41 15 PCM power diode, PCM power relay, Vapor management valve,
Heated oxygen sensors (HO2S), Electr. Vacuum Regulator (EVR)
solenoid valve, Evaporative emission (EVAP) canister vent valve
(9F945) one of these above mentioned components is shorted to ground causing that fuse to blow , Check the O2 sensor wiring to see if it is melted on exhaust pipe or manifold . Go youtube an check out how to find a short in an automotive electrical circuit !
These
Finding active short

Apr 28, 2016 | 2003 Mercury Mountaineer

2 Answers

2003 mountaineer V8 Temp gauge jumps to hot not over heating. Replaced thermostat, no change


The Engine Temp. sensor is bad. it is under the intake manifold. if there is a miss also check under the coils over the spark plugs. If there is Coolant in the spark plug holes .then the intake gasket is leaking. The intake manifold needs to come off to change the coolant sensor. When off look for corrosion on the cylinder head at the coolant port. If there is corrsion then the cylinder head must be replaced.

Jan 06, 2013 | 2003 Mercury Mountaineer

1 Answer

How to replace o2 sensor for 2002 mercury mountaineer


Unplug the oxygen sensor & remove by loosening
with a 22mm wrench or 7/8"

Bank #1 right side
Bank #2 left side

Do both front upsteam sensors together,not the
rear monitors

Rock Auto.Com --for sensors NTK or Bosch

Jun 02, 2012 | 2002 Mercury Mountaineer

1 Answer

How much would it cost to have the timing chain replaced on a 2003 Mercury Mountaineer?


For a 4.0L 6 cylinder $475.00 Parts and labor
For a 5.0L V8 the price is approx. the same.

Nov 29, 2010 | 2003 Mercury Mountaineer

3 Answers

Have a code on my Mercury Mountaineer 2003. 02 Oxygen sensor Bank 1 Sensor 1.Is that not the drivers side upstream sensor


Yes, that one is between exhaust maniflod and before the catilice converter, some where in between there, not after converter.

Jul 08, 2010 | 2003 Mercury Mountaineer

1 Answer

Where is the horn located in a 2000 mercury mountaineer V8?


I don't have my manual at the moment, but I think it's under the battery tray.

May 15, 2010 | 2000 Mercury Mountaineer

3 Answers

Engine light on mercury mountaineer code PO 174 PO 171 how do i fix it......


mass air flow sensor & the PVC assembly needs to be replaced

Jan 16, 2010 | 1998 Mercury Mountaineer

1 Answer

Cabin filter location mercury mountaineer


There is one for the 2003 Mercury Mountaineer. If you are smellign a "vinegar" odor, mix a solution of 1 part bleach to 3 parts water and pour it down the grid at the base of the windshield. It will take care of the smell.

Jul 08, 2009 | 2003 Mercury Mountaineer

1 Answer

Car constantly overheating


if it has a viscous fan hub --replace it
if it has electric fans , check/ replace the coolant temperature sensor , fan relays or fan motors
have a compression test done to check for gasket or cracked head/s
over heating once a week is not constant so have the fault codes read to check for heated oxygen sensor problems altering the air / fuel mixture

Oct 04, 2017 | 2003 Mercury Mountaineer

1 Answer

What side is cylider #2 on a 2002 mercury mountaineer


cylinder #2 is located on the passenger side of the engine, the O2 is in the exhaust pipe in front of the cat converter.

Dec 14, 2008 | 2002 Mercury Mountaineer

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