Need Help?

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
Other Trims
Do you own this car?
Estimated Mileage
Enter current mileage for most
accurate info about this vehicle

Track Your Service Records
Get Recall Alerts
Get Updated Value Estimates on Your Car.
back to question list

Ask the Community

Ask Our Auto Mechanics

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.

0/0 users found this helpful.

Ask our panel of certified auto mechanics a question. We pay for their advice so you don't have to

My Auto Score

See the free AutoCheck score

Meet The Experts
Kim Perrin
Kim Perrin is our resident mechanic here at DriverSide. Kim worked as…
Tyler Orr
Tyler Orr is an expert in German and Japanese cars and has been a mechanic …
Elizabeth Kriesten
Elizabeth Kriesten worked as an automotive technician for several years at Dodge…
Tips on Servicing

Car Brakes: How Do You Know When to Change Them?

By Zach Bowman For those who suffer a daily commute through heavy traffic, your vehicle's braking system can bring thousands of pounds of metal, plastic and empty Starbucks cups to a stop hundreds of times before you get to work. It goes without saying that these pieces wear out, but they do so slowly, meaning you may not notice they need attention until ...

Read more…