On certain models the drivers seat bushings can wear out and the seat can rock back and forth. Replacing the bushings are needed to repair this issue.
Problems for specific Honda Civic Si years:
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Repairpal verified 2006 Honda Civic Si problems
The front brake rotors can warp and cause a vibration when braking. The rotors will need to be machined or in cases where they are worn to thin, replaced to correct this issue.
On vehicles that have a sunroof, squeaking can occur. Special anti squeak tape should be applied to stop the noise.
A fluid leak may develop from one or both front suspension struts. Replacing the struts (usually in pairs) will be necessary to take care of the problem.
Plugged moon roof drains can cause a water leak inside the car, usually over the head of the driver or passengers head when turning a corner. Cleaning the drains will fix this problem.
A faulty power window switch can cause the power windows to stop working, or to work intermittently.
Damaged engine mounts can lead to vibration and roughness felt in the steering wheel. A rattle in the dash and engine area may also be heard. Replacement of damaged mounts will commonly correct these issues.
Front compliance bushings may crack and break. Damaged bushing should be replaced before damaged is done to suspension components.