Question about Subaru Cars & Trucks
Pluged in at emissions testing and not reading. Also pluged in at auto-zone and not reading.
When OBD 2 doesnt read it most due to a open fuse at the cigarette lighter, this fuse is loced at the eng fuse box listed as cigarette fuse when this fuse blows the OBD 2 pin 16 has no power and there fore no response to any code reader
Posted on Nov 08, 2012
Testimonial: "Found a fuse missing from fuse box. It was the the 30a Engine fuse. He is going to replace it and hopefully it works. Thanks"
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Posted on Jan 02, 2017
SOURCE: I failed the emission test
A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Posted on Apr 19, 2011
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