2001 Volvo S40 Problems

What owners report

Owners of this 2001 S40 most often write about brakes: pedal feel that is very hard until the car warms up, and rear or front pads wearing out unusually early. A second recurring theme is intermittent engine trouble — stalling, rough idle, hesitation and a check-engine light sometimes tied to oxygen sensors. Many reports come in between roughly 10,000 and 100,000 miles, with a handful of complaints describing abrupt power loss or unintended acceleration at highway speed.

1. 1
   Brakes

   Hard brake pedal and weak assist after sitting

   Mentioned in 12 of 60 sampled complaints

   Owners describe a brake pedal that is very hard and needs heavy pressure, especially at the first stops of the day or after the car has been parked for hours. Some say they must pump the pedal several times or let the engine run for a few minutes before the brakes work normally, and a few mention longer stopping distances. According to the complaints, dealers have replaced vacuum hoses, the vacuum pump or related parts, sometimes with the repair repeated. Reported from about 10,000 to 145,000 miles, most often in the 55,000-90,000 mile range and described as a cold-start or after-parking condition.

   What to check: Start the car from cold and press the brake pedal before driving; it should feel firm but not stiff and should not need pumping. Ask whether the vacuum pump or hoses have been replaced and keep records of any brake work.

   2 excerpts from owner complaints in NHTSA records

   “I have a 2001 Volvo S40 with brake problems. In the mornings when I get in my car and back up I have to almost stand up on the brakes to stop my car. I have almost went out in front of others cars because my brakes will not hardly stop. This occurs daily. If my car sits for a few hours it does it all over again. This to me is a safty issue because one day they are not going to stop and I'll have a wreck. I have two small children in my car. …”

   NHTSA complaint #10281474, filed 2009-08, 88,000 miles

   “I bought a 2001 Volvo S40 in june 2009. I noticed right away that the brakes didn't seem to work properly, as the stopping distance was far too long. They assured me the brakes were brand new. After driving it a few weeks, I became very nervous about the brakes because I had come close to rear ending several people. I brought it back to the dealer where I purchased it and asked them to double check the brakes. They did so and stated that they were fine. So, I drove extra cautiously from then on. …”

   NHTSA complaint #10298521, filed 2010-01, 73,000 miles
2. 2
   Engine cooling

   Stalling, rough idle and check-engine light

   Mentioned in 8 of 60 sampled complaints

   Owners describe the engine stalling at stop lights or while driving, needing heavy throttle to restart, along with rough idling and hesitation on acceleration. The check-engine light comes on repeatedly, and complaints mention oxygen sensors replaced more than once without fully resolving the symptom. Some reports link cooling-system work, such as coolant flushes and radiator leaks, to later engine trouble. Spread from roughly 25,000 to 110,000 miles, with several reports in the 25,000-60,000 mile range.

   3 related service bulletins

   What to check: Ask for service records on oxygen sensors, ignition and cooling-system work, and check for coolant loss or a sweet smell after a test drive. A pre-purchase scan for stored fault codes is worth the cost.

   2 excerpts from owner complaints in NHTSA records

   “I have a 2001 Volvo, model S40. During the last six months, I've experienced a stalled car engine -- especially when the car is idling at a stop light. When the stall happens, I must floor the accelerator to restart the engine again. This problem is the same as those already reported to the NHTSA for other Volvo models for the years 1999 to 2001.”

   NHTSA complaint #10131175, filed 2005-08, 37,498 miles

   “I own a 2001 Volvo S40. In early april 2005, my vehicle was diagnosed as being in need of oxygen sensors, which was the reason for my check engine to be activated. The problem is that my car had approximately 25,000 miles on it. As of mid october 2005, the check engine light has been reactivated and the vehicle was recently diagnosed at the Volvo dealership as needing new oxygen sensors-again. Currently, my car has 32,000 miles and is going on its third set of oxygen sensors. …”

   NHTSA complaint #10141844, filed 2005-11, 31,000 miles
3. 3
   Vehicle speed control

   Sudden acceleration or loss of power while driving

   Mentioned in 7 of 60 sampled complaints

   A number of complaints describe the car accelerating on its own at low or highway speed, even with feet off both pedals, and stopping only with very hard braking or by shutting off the engine. Other owners report the opposite: the engine losing power or dropping into limp-home mode during acceleration. Complaints note that dealers and independent shops often could not reproduce or identify the cause. Generally reported above 60,000 miles, with several cases past 100,000 miles.

   What to check: During a test drive, check that the throttle returns cleanly and the car idles steadily with no rise in rpm. Ask whether the throttle body or electronic throttle unit has been serviced or replaced.

   2 excerpts from owner complaints in NHTSA records

   “My 2001 Volvo S40 has accelerating on it's own, whether it is in park, drive or neutral mode. This has been happening on and off but most recently for the past two weeks. My mechanic has not been able to resolve the issue. Very dangerous situation.”

   NHTSA complaint #10355937, filed 2010-09, 125,000 miles

   “I'd like to report unintended acceleration in my Volvo S40. It started last summer and occurred sporadically until winter and has not occurred since then. No repairs were made during this time and I have not taken it to the dealer. Several times last summer I experienced sudden acceleration that required extra hard breaking to make the car come to a complete stop. The car seemed to be giving itself gas even while I was braking to come to a stop, requiring that I press the brake extra hard. …”

   NHTSA complaint #10308527, filed 2010-02, 90,000 miles
4. 4
   Brakes

   Early rear and front brake pad wear

   Mentioned in 6 of 60 sampled complaints

   Several owners report rear or front brake pads needing replacement at low mileage, some within the first 15,000-25,000 miles, with grinding or squeaking as the warning sign. Complaints describe dealers saying this wear rate is normal for the model and, in some cases, covering only the first replacement. A few owners also note brake lines rusting through and leaking fluid at higher mileage. Mostly reported below 25,000 miles for pad wear; brake line corrosion reported past 100,000 miles.

   What to check: Have the pads and rotors measured rather than just inspected by eye, and check the rear brake lines and fluid level for corrosion or leaks on a car of this age.

   2 excerpts from owner complaints in NHTSA records

   “I had the brakes serviced on my 2001 Volvo S40 at the Volvo dealer. At only 21,500 miles the rear brakes were grinding loudly. I complained to Volvo consumer services from their web page. They were not only not surprised at the rear brake failure at 21,500 miles, but said that they usually go out between 10k and 20k miles. The rear brakes on that vehicle are poorly designed, creating a potential accident hazard because of consumers' ignorance of their under-engineering. …”

   NHTSA complaint #10023312, filed 2003-06, 21,500 miles

   “At 19,600 miles the rear brake pads wore out on my wife's 2001 S40 Volvo sedan. We were told by the dealer this is normal and that they have seen some s40s wear the rear brakes out as early as 12,000 miles. Based on a reasonable persons experience this is much too early for brake pads, especially the rear ones to be wearing. This must be a design defect and should be covered under warranty or better quality pads should be installed on the car. Searching the web I have this is a common complaint about s40s. …”

   NHTSA complaint #10037199, filed 2003-09, 19,600 miles
5. 5
   Air bags

   Airbags not deploying in a crash

   Mentioned in 5 of 60 sampled complaints

   Complaints describe frontal impacts where the airbags did not deploy, in some cases with injuries reported by the occupants; one owner notes the seat belt also failed to hold the driver. Other reports involve the airbag warning light coming on soon after purchase and returning after dealer repair. No cause was identified in most of the accounts. Reported across a wide mileage range, from near-new vehicles to those past 60,000 miles.

   What to check: Confirm the airbag warning light comes on at startup and then goes out; a steady light means the system should be diagnosed before purchase.

   2 excerpts from owner complaints in NHTSA records

   “I am reporting this incident because the front driver and passenger airbags fully deployed when the undercarriage of the car and right front tire struck pavement at approx. 45 miles per hour. The car did not stop, and the driver had to manually beat the airbags back with his hands to see and bring the car to a stop. This incident was reported to Volvo USA, they removed the sensors for investigation, then reported back to me in writing that they operated normally, and that there was sufficient impact to the undercarriage to cause deployment. …”

   NHTSA complaint #762237, filed 2002-05

   “Battery was drained, and this caused car not to start at 150 miles. Srs light kept coming on at 1100 miles. This indicated that there was something wrong with airbags. At 1400 miles, srs light appeared again after dealer had corrected problem. The vehicle failed to start. The forward and backward seat adjustment was not working. There was noise coming from the sunroof. The engine was noisy. The engine light came on.”

   NHTSA complaint #875312, filed 2000-11

Buying note. These cars are old enough that condition and service history matter more than model-year reputation. Check the brakes carefully from cold, scan for stored engine codes, and confirm the airbag warning light behaves normally on a test drive before deciding.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Counts refer to that sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.