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.
Resources for the Repair and Maintenance of your 2004 Subaru Impreza
2004 Subaru Impreza
2004 Subaru Impreza Problems
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
There is a technical service bulletin on the ABS control module. It is replaceable without having to replace the entire anti-lock brake hydraulic unit. Previously, the ABS control module was only available as a complete assembly that included the hydraulic unit.
2004 Subaru Impreza Recalls (Recent)
Summary: ON CERTAIN PASSENGER SEDANS, WAGONS, AND SPORT UTILITY VEHICLES, THE CRUISE CONTROL CABLE COULD COME OUT OF ITS TRACK ON THE CRUISE CONTROL LEVER AND LODGE ON THE CONTROL LEVER TAB WHEN THE ACCELERATOR PEDAL IS RELEASED. IF THIS CONDITION OCCURS, THE THROTTLE WILL NOT RETURN TO THE IDLE POSITION AND WILL REMAIN IN AN OPEN POSITION.Learn more »
RepairPal Expert Overview:
On 26 vehicles, the engine oil control valve cover may not have been tightened properly, which could allow oil to leak. If leaking oil contacts hot engine components, a fire could result in the engine compartment. Dealers will inspect and retighten the oil-flow control valve cover bolts. The recall began October 8, 2004. The Subaru recall number is WWU-05.
RepairPal Expert Overview:
The front lower control arms may break at the hanger brackets due to corrosion. This corrosion is commonly a result of the hanger bracket being exposed to salty conditions, such as roads where salt is used as a snow melting agent. A broken control arm can result in loss of vehicle control, increasing the risk of a crash. Dealers will inspect the affected control arms and rustproof or replace them as necessary. The Subaru recall number is WVX-34.
2004 Subaru Impreza Questions and Answers
appreciate any special instructions how to replace this bulb? thanks
Car makes a clicking noise in front end when making slow turns. I was told it might be the axle boot but not sure why a torn boot would cause a clicking noise. Car has 150000 miles on it
The ticking occurs with both a warm or cold engine.
It is cold outside and the sound goes away after the car has warmed up but it is concerning.
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...