Question about 2004 Ford Freestar

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Engine light on

Where are the O2 sensors? Are they hard to change?

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No / what code does it say or you dont know/ there are sometimes 4 o2 sencers

Posted on Oct 22, 2008

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O2 sensor is comming up on service engine light warning, auto parts store says that there are 2 sensors on the car. Up stream and down stream. What are the locations for these and how hard are they to...


Hi Steve ..it refers to the location of the oxygen (o2) sensors relative to the engine. The upstream sensor is the one closest to the engine. The downstream sensor is furthest from the engine. Think of it as the way a stream of water, or in this case, a stream of exhaust flows.... From the engine To the tailpipe.
Changing them is no problem, getting to them sometimes can be a bear,, if you can reach them,, its simply remove the old one with a couple of bolts, and unplug it,, and replace

Aug 25, 2011 | 2000 Saturn SL

1 Answer

O2 light stays on


You're lucky you have an O2 sensor light, which most cars do not have.
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Did you change both O2 sensors?

Jul 11, 2010 | 1992 Isuzu Trooper

1 Answer

2000 windstar service light on


Your van has four o2 sensor's, the code should tell you which one is bad for exsample code should be like,
o2 sensor bank 1 sensor 1 or 2
o2 sensor bank 2 sensor 1 or 2

Also make sure you don't have a vacum leak.

Jun 11, 2010 | 2000 Ford Windstar

3 Answers

03 toyota highlander 57400 miles, oil & filter just changed. The check engine light is on. What could it be?


MANY THINGS CAN CAUSE THE LIGHT TO COME ON THAT LIGHT INDECATES A MALFUNCTION IN THE SYSTEM ITS HARD TO SAY WHAT CAUSED IT WITH OUT HAVEING IT CHECKED GO TO AUTOZONE THEY PROVIDE A FREE SERVICE CHECK ( OBD 2 96 & LATTER) GET IT CHECKED OUT THEN I'LL TELL YOU HOW TO FIX IT

Mar 02, 2010 | 2003 Toyota Highlander

2 Answers

Service Engine soon light on - diagnostic code says o2 sensor. What is an O2 sensor and is it hard to replace


You'll need to give us the specific code, in the format P0xxx. Just saying "O2 sensor" doesn't mean anything. It could be the heater circuit, fuse, o2 sensor itself, etc. Changing an O2 sensor isn't too hard but you may not need to replace it/them.

Please report back with the code or look it up at http://www.check-engine-light.com

Nov 13, 2009 | 2002 Pontiac Montana

4 Answers

Code PO131


Code PO131 is O2 sensor circuit low voltage , bank 1, sensor 1. That sensor I would say is the one in the exhaust manifold. I would check voltage to the sensor from the computer. If the voltage is not 5 volts, then it could be a computer problem or a wiring problem. I have seen factory wiring and connectors give a voltage problem. Check for a damaged or burnt, pinched wire. You need to know for sure that the voltage is correct to the sensor. Intermittent problems are hard to trace , but patience and knowledge helps.

Mar 11, 2009 | 1999 Honda Civic

2 Answers

Check engine light on


There are only 2 banks in the engine. That means that if it has 2 O2 sensors they may both need replaced. .....More than likeley it has 2 or more O2 sensors. They shouldn't be hard to locate.

Jan 20, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

Check engine on


o2 sensor is usually located on the manifold of most 4 cylinder engines they are normally a one wire connection. you will need the following:

New oxygen sensor....these can be really expensive.
a open end wrench that fits the O2 sensor, or an O2 sensor socket and a ratchet to loosen and tighten the O2 sensor

Start by driving the car to get the car warm o2 sensors can be very hard to get out if they are cold.

if you think you might burn yourself on something hot put thick gloves on, you will have to disconnect the on wire on the o2 sensor, unfortunately you cant wear gloves while doing this, so be extremely careful as the exhaust will be very hot.

After wire disconnected loosen o2 sensor by going counter clock wise using either a o2 sensor socket or a appropriate wrench

while wearing gloves, after the sensor is loose enough unscrew by hand, remember it is still very hot.

you can let engine cool down now if you want.

put new o2 sensor in tightening it firmly and replug the electrical connector back up.

if your check engine light does not go out take to autozone and have them reset your computer, or you can disconnect your battery cables for 20+ minutes and this resets the computer also.

Aug 09, 2008 | 1996 Mercury Mystique

2 Answers

Autozone diag: Check eng light o2 sensor - is this a do it yourself job?


its not hard to change the o2 sensors but if they are baked in which means really hard to break loose u could have problems try spraying them down with p.b blaster and getting them out

Jun 15, 2008 | 1998 Toyota Avalon

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