My wife's 2003 Vue has the Check Engine light and Service engine soon like coming on at random times, but at the last oil change no codes were found. Mechanic suggested it was an oil leak, but we have no evidence of that, as there is no puddle under the car and the oil level is unchanged. The car handles fine, but this is a concern.
For the engine light to come on there will be codes stored
It is that the mechanic is not using the correct scanner with the right protocol installed to read them
SOURCE: The problem with my 2002 saturn vue is service engine comes on
go to like an auto zone or advanced auto parts and have them pull the engine codes....this will give you ageneral direction to go
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: my 2001 Saturn 300 is displaying the service engine soon light.
Absolutely yes; First, even if the oil level is fine, it should be changed every 5.000 miles regardless. This could be why your light is on but it could also be something more serious. You'd be doing yourself a favor by having the oil changed and having the light reset. If the light comes back on, it needs to be diagnosed to prevent a possibly more harmful problem from doing damage to the car.
Hope this answers your question. Best of luck.
Greg
SOURCE: service engine soon light, service light, reduce power etc.
It is most likely the Throttle Position Sensor has gone bad. But if the check engine light is on, the only way to tell exact problem, is to have a scanner placed on the vehicle to have the codes read.
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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