2004 Honda Civic Si Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2004 Honda Civic Si

2004 Honda Civic Si Problems

PCM Software Update to Correct False Oxygen Sensor Code

On certain models the Powertrain Control Module (PCM) can misinterpret the secondary oxygen sensor data and set a false Check Engine Light. A software update from Honda is needed for this issue.

Warped Front Brake Rotors May Cause Vibration When Braking

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.

Check Engine Light and "no start" due to faulty transmission range switch
On certain models the automatic transmission range switch can fail and cause the Check Engine light (MIL) to illuminate, and the engine may not crank intermittently. Replacing the range switch is needed for this repair.

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2004 Honda Civic Si Questions

Engine revving higher,usual operations,gas pedal not engaged.? (3 answers)

2004 civic si, 77000 miles no prior mechanical issues, was at a stop in neutral and engine was revving up to 3500 rpm. when in gear car wants to speed up even though gas pedal not engaged. Total weird time was about 10 minutes, car seemed to correct itself(?)...

Engine light goes on often. would a new gas cap solve this problem? (1 answer)

Gas cap has been notched up.

It was park around 2years.For some reason my car can't started.HELP ASAP please! (2 answers)

The person that "supposed" take care of my car I think that never started my car. I change the battery and my car doesn't started.

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