Question about 2002 Ford Mustang

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Service engine I have a service engine light on i am running too lean and either both 02 sensors gone bad at same time or something else, any suggestions also where is the fuel filter located?

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If you want to change you fuel filter it take a special tool for a ford it should be in on the inside frame under the drive side. Also try taking your car to and auto part store and have them run the obd 2 code reader to find out why your engine light is on they usual don't charge for that

Posted on Jan 20, 2009

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Fouls plugs after 50-55mph


its rich, (which engine, there are more than 1) ?????
and is not in closed loop mode (ECU) fix that first.
so diagnose rich.
EFI engines. no country stated, as others have carbs way newer,.
1: too high fuel pressure, (gage it) alldata.com has spec. and steps.
2: injector(s) leak. same tool above finds this, ask.
3: ECT reads low temp all time time, (thermostat bad, or missing?)
4: IAT reads too low. (TBI engines, with MAP sensors)
5: 02 sensors bad. (if all else is good and o2 reads wrong its bad)
6: exhaust leaks near, 02, causing o2 to read lean, forcing max rich.
7: did you run the ECU scan codes? the Check engine flashing light using the diagnostic jumper , yet?

mostly those. there are tests for each. ASE ways and means.

if your swift has a heated 02 sensor, it can even hold closed loop
at idle..... sure can, and if so , i check that first.
then closed loop at 2500 rpm , in neutral. (how is complex)
on these old dogs. suz, the worst ,no scan tools. are sold over the counter. so I must use a scope.
i watch the 02 sensors output. and make sure engine goes to closed
loop, if not i fix that. first.
there are ways to do this, (by me forcing lean or rich using other tricks of the trade. ask. I do so , to see if i can wake up the o2 sensor.
this is all covered in ASE courses...... this magic./

id be all over, fuel pressures, REAL not guessing or squirting checks bs.
id be all over exhaust leaks near the O2.
and first a new 02. most cars, its like long ago ,dead and you
look and the tip is , GONE! 1992 oxy sensors are useless.




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1 Answer

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Ok this is either a shorted wire or bad connector or just plain a bad 02 sensor or a stuck injector or bad PCV needs cleaned. You stated it runs great i would go with Bad 02 sensor first or check for possible exhaust leak and last check for bad converter.

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1 Answer

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Generally if the vehicle is running lean on one side the O2 sensor is bad. The oxygen sensor is normally located at the back of the exhaust manifold, and there is one on each side. It is best to replace both at the same time to save money and problems later on.

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I have a 04 f150 with the 5.4 check engine light is on and it read o2 sensor changed twice still read same problem


you have to figure out what is causing the 02 to activate the light, lean or rich exhaust emissions? what its saying is the sensor is working and it has detected a bad emissions or fuel mix in the exhaust, it is not telling you the 02 is bad, thats what the sensors do they detect faults with temps,knocks,emissions, timing,crank position, fuel air mix,throttle position. so the 02 is detecting something and that something is what needs to be found.

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I have a 2000 Hyundai Sonata that runs rough when you start it up. I hooked a code reader to it and it said that system was lean on bank 1 and multi misfire and not reading 02 sensor on bank one. I have...


time to get the engine properly scanned, real time not code scanner, then you will have the readings from sensore and actuators, diagnose from there

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I have a 2002 chevrolet blazer with a 4.3, 4dr, 4wd. Service engine soon light came on, took it to the auto part store to code it they said knock sensor, 02 sensor, low evap voltage or something close to...


No I don't think so, knock sensor only work under engine load, when sensor picks up a ping or knocking, it will adjust timing, o2 sensor could be bad, and will save you fuel mileage, but a miss will also give you an o2 sensor code, running rich, have him check for cylinder miss first.

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HI THE CHECK ENGINE LIGHT IS ON IN MY LINCOLN TOWN CAR 95. THE CODE SCANNER READS "TOO LEAN" WHAT THAT MEANS? AUTOZONE PEOPLE IT SAYS THE 02 SENSOR IS BAD, IS THIS CORRECT??? THANKS.


what code did they give the code will tell u something like "o2 lean bank ? sensor?" and if auto zone is telling u that its giving an o2 sensor problem most likely thats the trouble code that showed up and which sensor

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1 Answer

Running lean


02 sensor is what causes lean and rich mixture. If it is not correct then 02 sensors beed ti ve reokaced,

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Could a bad o2 sensor on my 98 grand prix gtp cause the car to idle higher than normal at times. It started happening more since the temps have gottin hotter.


What your ssying does not make since so let me explain how it works, the 02 works like this when cold in the morning when the car first starts the car is in open loop meaning that it will run rich until the engine has reached operating temprature, once it has it goes into closed loop meaning the 02 sensor now determines the pulse width of the injector opening or how much fuel to give the car under all driving condtions, if one of the 02 sensors goes bad the computer goes into open loop giving the car the same amount of fuel as if it were a cold engine, (running Rich) if it was to lean out the car it is possible to make the engine run hotter because a lean engine causes the car to run hot, so at that pointthe EGR valve steps in and puts inert gas into the intake chamber (Exhaust Gas) since this won't burn it it makes the fuel mixture lean this can cause the temprature to rise slightly but not enought to over heat. A plugged catalitic converter can cause it to over heat and so can a fan not functioning right can cause itto over heat but not the 02 senor it has a limited range of fuel adjustment, and if it was bad it would actually run cooler because the fuel mix would be rich, causing the car to run cooler, this helP.

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