Question about 1999 Saab 9-5
The code does exist. It is for a short on injector number six. You either have some bad wiring somewhere between the injector and the computer or a bad injector or possibly a faulty computer, I would carefully visually inspect the wiring from the injector to the computer and if that checked out ok then I would replace the injector. After repair clear the code with a scan tool and see if the code comes back. If it comes back after all that then consider replacing the computer. Tracing short are never fun but a little patience and it can be found. Good Luck!
Posted on Mar 20, 2011
My check light had been on since i left colorado and when i got home i found that it was a vacuum hose not connected to the throttle valve,put it back on went and had it checked out with tech2 no known code went trough inspection after getting the check engine light out.every thing was fine until i pulled the ac fuse from the car and again the check engine light came on.well i'm thinking that the smallest change in anything with the saab will trigger the engine check light to come on.again i have to check all my vacuum lines and get back to you on this.but the car is worth the effort.the tech2 didn't come up with the code but i'm sure it was the vacuum that did it.
Posted on Oct 11, 2011
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Posted on Jan 02, 2017
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A P0300 diagnostic code indicates a "random" or "multiple" misfire.
Unfortunately, P0300 doesn't tell you specifically which cylinders are mis-firing, nor why (code P0301 would indicate cylinder #1; P0302 would indicate cylinder # 2 etc). This means there could be an issue with any number of components/circuits relating to the ignition/combustion circuits.
I would recommend you check for the following:
Sometimes the underlying cause of a random misfire is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold, unmetered air getting past the airflow sensor, or even an EGR valve which is stuck open.
Hope this helps...
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