2004 Subaru Impreza Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2004 Subaru Impreza

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2004 Subaru Impreza Problems

Engine Misfire Due to Failed Spark Plug Wires

Sometimes the Check Engine Light illuminates because the computer detects misfires. Subaru released an improved spark plug wire set to solve the problem. The ignition coil should also be inspected for carbon tracks or short circuits between the contacts

Check Engine Light Due to Failed Knock Sensor

The Check Engine Light may illuminate because of a failed knock sensor. Although the sensor often tests okay, it can fail intermittently, while the vehicle is being driven.

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2004 Subaru Impreza Questions

What to replace when doing a head gasket repair job (1 answer)

We found a small external head gasket leak on the front left side on my impreza. I have jumped on it early, and have a fair amount of cash to invest into it.. What else should I replace? Any advice for the repair itself?

Timing belt, water pump and pulleys done about 4k ago...

5speed manu...

Car starts up and is very loud in the morning. Sounds like a very loud ticking. (1 answer)

It is cold outside and the sound goes away after the car has warmed up but it is concerning.

I have a ticking noise which increases with acceleration. (1 answer)

The ticking occurs with both a warm or cold engine.

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2004 Subaru Impreza Recalls

Front Passenger Air Bag Defect

In a crash that deploys the passenger front air bag, the inflator of the air bag can rupture, causing metal debris to strike vehicle occupants. Dealers will replace the front passenger air bag inflator free of charge to correct the concern.

Passenger Airbag Inflator

Moisture sensitive airbag system components may deteriorate in humid climate regions, causing an increase in inflator pressure which ruptures when passenger airbags are deployed. Injury can result from inflator parts striking an occupant. Dealers will replace affected airbag inflators to correct this concern. Subaru is the manufacturer of Saabs affected by this recall. This recall supersedes Subaru recall 14V-471.

Front Airbag Inflator Module

This limited regional recall is for vehicles currently registered or first sold in Florida, Puerto Rico, Hawaii and the U.S. Virgin Islands, and equipped with Takata-brand air bag inflators. Upon deployment the driver and/or passenger airbag inflator could rupture, increasing the risk of personal injury. Subaru dealers will replace the affected airbag inflator modules to correct this concern.

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