Accessory belts and pulleys, engine computer, engine mounts, engine knock or ping, oil leaks.
What Owners Say
“The car would slightly accelerate and decelerate back and forth during steady state driving. You could watch the mpg gauge rapidly changing when this occurred. Very annoying. I have had experience with 8 Subaru's and never before experienced this. After the 2nd time back to the dealer the mechanic said he felt it but that it was normal. We left the car for 2 weeks while they ran test and the sent the data to Subaru. Subaru finally sent an engineer out who didn't disagree that the car was doing t”Anonymous, CO (2017 Subaru Crosstrek Premium 2.0-L 4 Cyl)