Two problems related to engine knocking noise have been reported for the 2009 Subaru Forester. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Subaru Forester based on all problems reported for the 2009 Forester.
Loud knocking sound noted coming form engine while driving on highway. Pulled off of highway then all the warning lights on dashboard flickered on and engine died. Had to tow to dealer. Informed that a rod had knocked loose related to faulty bearings had to have engine replaced.
2009 Forester bought in July '08. Less than a year and 20,000 miles, the engine failed. I was driving long distance, and had stopped at a sign when I noticed a load banging noise from hood. As I placed pressure on the accelerator, the car didn't react appropriately - it was slow. The car was towed, and a replacement engine is being installed. I have called Subaru of America for possible buy-back, but no return call. I've read of other similiar cases occurring with the 2009 turbo models.