It lets the computer know the position of the crankshaft and piston so that it can inject fuel at the proper time.
SOURCE: check eng light with code po431 replased ox/sensors
P0431 is Warm Up Catalyst Efficiency Below Threshold (Bank 2). What is happening is this....the O2 sensor downstream of the Catalytic Converter is detecting the Converter is not working as efficiently as it should be (according to your cars specifications). 3 main causes of this is 1.) Defective O2 Sensor (which in your case elminates this one) 2.) Catalytic Converter is no longer functioning properly. or 3.) There is an exhaust leak. You will not notice any driveablitiy problems, however, you may get a rough/hard idle when its cold out. I would take your car to an exhaust shop and have them do a free exhaust system inspection. Alot of places like Midas/Mieneke Car Center/Monroe Muffler to name a few do these checks for free. Thanks for Using FixYa!
Sincerely,
JC
SOURCE: service engine soon light on 2003 Saturn Vue
Here is the definition of the code in GM manual:
P0128 - Coolant Thermostat Below Thermostat Regulating Temperature, this indicates the engine is running cold, u need a thermostat
SOURCE: 2003 Saturn Vue WHERE IS THE TRANSMISSION FLUID REFILL
If it is a 2.2 Auto it has a VT25E Trans,A really bad experiment from G.M.There is no dipstick.The only way to check it per service is to remove the center part of the main drain plug while running in park,if fluid drains or trickles out they say it's full.You probally have other Issues inside the trans.Check your mileage they have a special coverage period for this Trans through Saturn Dealer!! They May cover it or do a partial coverage for you.Hope this helps
SOURCE: 2003 Saturn VUE Steering Column Noise and Resistance
i am a saturn tech and ive never heard of this concern,the columns do go bad but they just set a ses light and cut out power,the column could be bad,it could also be the intermediate shaft u joint binding,,,i rec take to dealer, could be serious
SOURCE: 2003 saturn vue trouble code p1599
P1599 IS A STALLING ISSUE COULD BE BAD GAS / BAD FUELPUMP DIRTY FUEL FILTER
DISCONNECT BATTERY AND SEE IF THE LIGHT COMES ON AGAIN
U2107 HAS SOMETHING TO DO WITH THE COMPUTER LOOSING POWER AT THE BODY MOUNTS CHECK CABLES AND GROUND STRAP
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