The IMA light coming on is usually caused by a battery pack that is no longer charging correctly. Replacing the battery pack will turn off the IMA light.
Car problem reports
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Most reported 2004 Honda Civic Hybrid problems
On Certain models a faulty power window switch can cause the power windows to work or not work intermittently.
Front compliance bushings may crack and break. Damaged bushing should be replaced before damaged is done to suspension components.
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.
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 harsh engagement of the automatic transmission may be noted after the engine auto stops. A software update for the powertrain control module (PCM) / constantly variable transmission (CVT) is available which may correct this issue.
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.
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.
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.