On certain models the upper windshield molding vibrates at a higher speed causing a noise. Back filling the molding with silicone sealer will eliminate the noise.
Problems for specific Honda Civic Si years:
Car problem reports
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Most reported Honda Civic Si problems
The air cleaner case is prone to cracking. This can make it difficult to remove the screws securing the cover, making it difficult to replace the air filter. Replacing the case is often necessary to address this issue.
On certain models the engine RPM does not drop immediately and can cause a surge when driving in first gear. A software update is required for this repair.
On certain models the windshield wipers will not park in the proper place or won't shut off. The wiper motor must be replaced to repair this issue.
On some models with automatic transmissions, during a cold start at high altitude the brake pedal feels hard. Replacing the power brake booster and updating Powertrain Control Module (PCM) the with a Honda software update is needed for this issue.
In some cases drive belt noise can be heard from the passenger compartment. Installing a new updated belt from Honda and rerouting the belt is needed will commonly correct this noise issue.
On some models the bump stop in the strut can cause a noise on turns. Replacement of the bump stop will fix this problem.
Leaking tail light gaskets can allow water into the tail light assembly and inside the vehicle. Replacing the tail light gaskets will commonly correct this issue.
Certain models can have a crowned rear brake drum that can cause a vibration when braking. The rear drums will have to be replaced to correct this issue.
The idler pulley for the AC compressor belt can fail causing a growling type noise. The idler pulley will have to be replaced to stop the noise.
The shift control solenoid externally mounted on the automatic transmission can fail and causes a harsh 1-2 shift. Replacing the shift solenoid and flushing the transmission with genuine Honda automatic transmission fluid may eliminate harsh shifting characteristics. A broken internal spring can cause the same issue. If the shift control solenoid does not repair the problem, the transmission will have to be replaced.