Question about 2003 Saturn VUE

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SATURN OF KNOXVILLE SAID THAT THEY ARE SWAYING TO THE COMPUTER OF THE CAR BUT WHEN I WENT TO AUTO ZONE THEY SAID THE DIAGNOSTIC SAID IT WAS THE O2 SENSOR. SATURN ALSO SAID WHEN THEY STARTED THEW CAR UP IT WOULD CRANK BUT IT WOULD DIE ON THEM WHEN THEY DROVE IT

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Hello! Since I do not know which engine is in the vehicle, I'll base my solution on the 4 cylinder...The O2 sensor is more than likely contaminated...This particular sensor can lie to the
computer...Generally it reacts to another fault...Cause and effect...The cause may very well be to rich of a fuel/air mixture...The effect is a contaminated O2...The engine will start but then stall when attempting to accelerate...I suspect a faulty Manifold Absolute Pressure (MAP) sensor...It is called the "fuel boss"...Request that the MAP be tested before the computer is changed...A wee bit of knowledge can save you a lot of money...There are three wires in the MAP connector...Orange/Black...Light Green...And Gray...With key on...The voltage across Light Green and Gray must read 5 volts...If it reads much less than 5 volts it is defective...It can be purchased for $93 at Auto zone or $75 (shipping included) at www.rockauto.com...If you want to test it yourself send a comment and I'll guide you.............Guru............Saailer



Posted on Jul 15, 2010

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I would trust the dealer over Autozone if they experienced these problems. However, if the car is running an the O2 sensor code was stored, go for that first.

An O2 sensor will not cause a driveability problem until the car is warmed up as the O2 sensor doesn't come into play until the exhaust is good and hot.

If the car cranks but dies on them when cold, then it's the crank sensor or computer in that order.

Good luck to you.

Posted on Jul 15, 2010

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