There are 2 stored owner reports matching the engine leading-label group for the 2003 Volvo S40 in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 2 of 2 matching reports.
Open the full vehicle complaint log (all categories)Engine light stays on. I have had 2 mechanics check it out. They don't know why the light is on. I am very concerned about the fuel line problem.
I WAS DRIVING WHEN THE CAR START TO ACCELERATED BY ITSELF, ACCEL PEDAL WENT TO THE FLOOR. I COULD NOT KEEP A CAR EVEN BY THE HAND BRAKE, SO AS IT WAS JUMPING AHEAD. THEN THE CAR BEGAN TO BLOW BLACK AND WHITE SMOKE OUT UNDER THE HOOD. SOME HOW I TURN OFF THE ENGINE, TOOK THE KEY AND RUN AWAY FROM THE CAR IN THE MIDDLE OF THE TRAFFIC ROAD. GREEN LIQUID UNDER THE CAR. IT DIED ON THE ROAD. POLICE CAME, THE CAR TOWED. AFTER SEVERAL DAYS OF CHECKOUT : T/3.8 CHECKOUT AND REPLACED T-STAT, TEMP SENSOR, T-STAT HOUSING GASKET; BG COOLANT FLUSH ; PCV; ENGINE VENT; ENGINE MECHANICAL; BG POWER STEERING; BG BRAKE AFTER A WEEK I GOT THE SAME--JUMPING, NOT STABLE, ACCEL PEDAL GOES TO THE FLOOR. INTERNAL SHORT IN CYL 3 AND 2 COIL AND FOULED SPARKPLUGS T/1.5 REPLACED COIL PACK FOR CYL 3 AND 2 AND REPLACED SPARKPLUGS. *TR
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.