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Re: Service engine soon light 2004 Alero
If it truly set code for "loose fuel cap" or po455 large leak, then tightening the cap and driving a couple days should reset on its own. if not then get it checked for free at autozone and report back with code # and can help from there. they'll ck for free but are not allowed to reset.
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Gm vehicles generally do not like to be run out of gas. The fuel in the tank helps keep the fuel pump cool. If it was running before you filled it than it is very likely that the pump has gone bad.
A couple of things you can do. Look for the fuel test port on the fuel rail. Remove the plastic cap and press in the schrader valve. there should be a spurt of fuel when it is depressed (use caution as not to get fuel in your eyes). If nothing comes out crank the engine over a couple of times and try again. If nothing still comes out we have confirmed it is a fuel issue.
You will need a helper for this next trick. Get a rubber mallet and smack the center of the fuel tank with the mallet while your helper tries to start the engine. If the engine starts replace the fuel pump.
You may have a faulty Computer- if the car is running you may be ok Make sure it's not the oil-service light thta's on- you reset that by having the odometer displaying the total miles, then turn off the igntionfor a moment. Then turn igntion on - don't start the motor- then with-in 5 seconeds press the gas pedal to the floor. this resets the oil service light.
The fuel level sensor is at fault and is setting the service engine soon light on. Your local Nissan dealer can repair this under warranty depending on your mileage. The fuel tank will need to be removed to access the sending unit.
I have the exact same problem it took awhile before I figured it out.This car requires the medium octane gasoline .The 87 octane gas causes the engine to run on the lean side and triggers the "service engine soon light".By putting in a higher octane gas (middle range 92 octane) the light won't come on.Or you can get your service mechanic to set a richer gas mix for your car,however you'll lose about 2-3 mpg .