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2009 Subaru Forester X 4dr Man

2009 Subaru Forester
Trim Info:
All Wheel Drive, 4 Door, 4WD Sport Utility
20 mpg city / 26 mpg hwy
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December 5, 2010, 4:24 pm

Ron W
 

Question: Code reading PO301 and PO303 Misfire

I have a 2003 Subaru Forester and the computer is reading PO301 misfire and PO303 misfire. I replaced the ignition coil a $180.00 part and the fuel filter and it did not solve the problem. I sprayed the wires with water and got no arching. Any help please. The car ran great and the next day after we got a lot of rain as soon as I started it I had this problem


December 8, 2010, 3:33 pm

Ron W
Expert Mechanic

Start with basic tuneup stuff. If that's done, you check compression on those cylinders. I may be mistaken, but I believe your vehicle should have a coil over plug ignition system. Meaning each plug has it's own coil. If that is the case, swap the coils from the two bad cylinder with two good cylinders and see if the codes stay the same or change with the coils. If it changes, the coils are having issues, if not, you still need to look at the misfiring cylinders.


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