The AC idler pulley can fail causing a growling noise from the engine. A new idler pulley will be needed.
Problems for specific Honda Civic years:
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Most reported Honda Civic 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.
Worn door locks (tumblers) can cause the lock not to work. Removing the lock and replacing the worn parts (tumblers) is needed to get the lock working again.
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.
A worn (front) bushing on the rear lower control arm can cause a noise when going over bumps. Replacing the worn bushing should stop the noise.
An oil leak at the spark plug area (spark plug tubes) can be caused by a failing valve cover sealing rubber and/or camshaft holder o-ring. The sealing rubber and o-ring will need to be replaced to address this issue.
A faulty regulator on some models will cause the head lights to change intensity. The alternator needs to be replaced for 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.
On vehicles that have a sunroof, squeaking can occur. Special anti squeak tape should be applied to stop the noise.
Certain manual transmissions can cause a clicking noise when turning right due to a reverse gear contacting other gears in the transmission. The transmission needs to be disassembled and new updated gears installed to stop the noise.