SOURCE: 2002 Saturn Service Engine Soon
The check engine light could come on for a variety of reasons. Your car is loaded with electronic solenoids with voltages running to them. If you are getting low voltage at a Throttle Positioning Sensor for instance you will get a code for that. For around $100.00 at WalMart you can pick up a Code Reader. It will give you a code that you can look up in a service manual and it will tell you what the computer is reading as the problem. It will only get you in the ballpark, not diagnose the problem. For that you can utilize this forum or you can take it to the dealer or a repair shop and they can diagnose it for you, but in any event the Check Engine light doesn't come on for no reason even if the car seems to be running fine.
SOURCE: 99 saturn sl2 has lost reverse
Last time this happened to me Saturn replaced valve body in tranny, this can be easily done at home if you are handy
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: 2002 Saturn Vue V6 Loss of Power
Yup. The throttle body connectors have a history of failing on these cars. Replace the throttle body and the wire connectors that go to it, and you're back in business. Not terribly difficult and you can get the parts from any dealer. Saturn actually has a bulletin out on this problem but they won't cover it unless you're under warranty - no recall for this.
SOURCE: 2004 Saturn VUE (M/T) STEADY service engine soon light
SOME TIME PCM GET A VOLTAGE SPIKE.OR ELECTRICAL INTERFERENCE WILL CAUSE SERVICE LIGHT TO COME ON WITH NO CODES.IF IT KEEP HAPPENING TAKE IT TO DEALERSHIP TO CHECK IT OUT.
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