The computer can misinterpret a low battery voltage and can cause a false Check Engine (MIL) light to come on. Updating the PCM can correct this issue.
2004 Honda Accord Problem Reports
RepairPal Verified 2004 Honda Accord Problem Reports
The PCM can misinterpret data from the air fuel sensor and set a false Check Engine (MIL) light requiring a PCM update to repair.
The AC condenser failed due to contact with road debris and a lack of protection for the condenser.
A faulty Electric Load Detector (ELD) can cause the head lights to dim and/or illuminate the Check Engine Light. A failed ELD will require replacement.
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.
The moon roof may not close all the way because of a faulty limit switch. The headliner must be removed to replace the limit switch.
Automatic transmission failures are common, Automatic transmission failure on these vehicles will generally require overhaul or replacement of the transmission. In the event of a failure, it may be worthwhile to check with Honda to see if they may offer assistance for this repair. As these vehicles age, Honda has become less likely to help out with these transmission related repairs.
One or both of the rear sway bar end links may break resulting in a knocking noise from the rear of the vehicle.
The ABS modulator (hydraulic unit) can leak air into the brake system and cause a low brake pedal. A new ABS modulator will be needed if it is diagnosed to be the source of the leak.
If the brake pedal feels hard the first time it is pressed in the morning, it could be due to a problem with the vacuum supply hose for the brake booster. A revised brake booster hose is available to address this concern.