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BMW 525IModel year report

2004 BMW 525I Problems

Complaints
84filed with NHTSA
Median mileage
89,314miles, 72 complaints with mileage
Recalls
0campaigns on record
Trend
StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
NHTSA crash rating
—overall rating starts with 2011 models
EPA fuel economy
20 mpgcombined, 2.5L 6-cyl RWD · 17 city / 26 hwy

Sources: NHTSA records for the 2004 BMW 525I (complaints, recalls, investigations), EPA fuel economy. Report an error

What owners report

Owners of this model year most often report the passenger restraint warning light coming on and staying on, which dealers commonly trace to the front passenger seat occupancy sensor; many owners say they were told their car was not covered by the related 2008 air bag recall. A second cluster involves heated front seats overheating and, in some reports, burning through the leather, along with trunk-mounted electronics damaged by water. Transmission and brake complaints appear too, mostly at higher mileage.

  1. Air bags

    Passenger restraint/air bag warning light stays on

    • 33 complaints (39%)
    • median 95,500 mi at 9.2 yrs old (28 state mileage)
    • filed 2004–2017

    Owners describe a 'passenger restraint system fault' message or an air bag warning light that comes on at startup and stays lit, often meaning the front passenger air bag is shown as off. Several say a dealer or independent shop traced it to the passenger seat occupancy mat sensor and quoted a replacement, and many state the manufacturer told them their vehicle was not included in the 2008 frontal air bag recall (08V384000) or that it was past the eligibility period. A few report the light returning after a repair. Reported across a wide mileage range, from under 50,000 to over 200,000 miles, with many appearing between 60,000 and 120,000 miles.

    What to check: Turn the ignition on and confirm no restraint or air bag warning appears and that the passenger air bag status shows as active with an occupant. Ask whether the seat occupancy mat has been replaced and whether the vehicle was included in the 2008 air bag recall.

    2 excerpts from owner complaints in NHTSA records

    “I own a 2004 Bmw 525I and the passenger side airbag and seat belt sign came on few weeks back. The dealer says its not covered but NHTSA site indicates it is covered on Bmw 525I 2004 vehicles. This dealer is estimating a $650.00 diagnostic fee to see what need to be done. What can be done to get the passenger side air bag sensor fault issue? My last option is the junk yard, and never buy a Bmw.”

    NHTSA complaint #10721898, filed 2015-05, 106,100 miles

    “There is a faulty restraint malfunction on the front passenger side seat. Regardless of whether or not a passenger is in the seat at all the airbag sign indicates that it is off. I am aware that this is a common problem and a malfunction in other Bmw 5 series and the dealer ships that I've went to refuse to acknowledge this even though Bmw headquarters released a recall for some a couple of years ago.”

    NHTSA complaint #10563165, filed 2014-02, 40,000 miles
  2. Seats

    Heated front seats overheat and burn the upholstery

    • 16 complaints (19%)
    • median 73,500 mi at 9.8 yrs old (14 state mileage)
    • 11 mention a crash, fire or injury
    • filed 2007–2017

    Owners report the driver or passenger seat heater becoming abnormally hot, producing a burning smell and in several cases burning a hole through the leather and clothing, sometimes with skin burns. Some say the seat was hot even when the heater was not switched on. Dealers, where involved, typically recommended replacing the affected seat or heating element; a few owners report the manufacturer declining assistance. Mostly reported between roughly 45,000 and 115,000 miles, with some cases at higher mileage; several occurred in warm weather.

    What to check: Test both front seat heaters through a full heat cycle and check the seat bottoms and backs for discolored, hardened or charred leather and for a burning smell.

    2 excerpts from owner complaints in NHTSA records

    “Driving down the road and smelled a burning smell. Turned off the seat heater. The seat felt very hot on my lower back. When I got to work noticed that the leather was burned through on the drivers left side. You can see the exposed wiring. Very dangerous. Bmw would not replace. In searching on line, I saw that this is a common situation on the seat heater element.”

    NHTSA complaint #10731387, filed 2015-06, 160,000 miles

    “I was driving in traffic when smell and smoke came from the bottom of my car, I park the car and check, my seat was burn, I turn off the heating and I'm not be able to used again the dealer on park ave in south hackensack nj don't get back to me. Plus now last week may 31 the passenger safety light came on we are thinking the car is curs.every repair is very expensive.”

    NHTSA complaint #10577829, filed 2014-04, 55,000 miles
  3. Transmission and drivetrain

    Transmission failsafe message and loss of drive

    • 6 complaints (7%)
    • median 65,000 mi at 6.0 yrs old (6 state mileage, few)
    • filed 2008–2012

    Owners describe the car refusing to shift, lunging when it does, or losing acceleration with a 'transmission fault' or 'drive moderately' message on the display. Some report the message clearing after a restart and returning later. Shops diagnosed a leaking mechatronic sleeve or, in other cases, called for a transmission rebuild or replacement; owners describe the repairs as costly. Reported from around 20,000 up to about 184,000 miles, with several cases near 40,000 to 90,000 miles.

    What to check: Drive at steady and varying speeds and watch for hesitation, harsh or delayed shifts and any transmission warning message; ask for service records on fluid changes and any mechatronic or sleeve work.

    2 excerpts from owner complaints in NHTSA records

    “2004 525I Bmw with 70,000 mi had transmission go out suddenly. I am the original owner and have had all scheduled maintenance at the dealer where the car was purchased. I was told the transmission is a total loss and it is nothing that I did or could have prevented, but the repair bill is ~7,000.00.”

    NHTSA complaint #10283339, filed 2009-09, 70,000 miles

    “I own a 2004 Bmw 525I with 119,000 miles on the engine. I experienced my car making a thump sound and then the I would lose acceleration. I called the mechanic and they could not find the problem because it did not show the dash errors. This had been going on for 3 weeks and then the mechanic told me my transmission needed replacing. I am disappointed that this is a common problem and nothing is being done about this. I will never buy a Bmw again.”

    NHTSA complaint #10436149, filed 2011-11, 119,000 miles
  4. Electrical system

    Trunk-mounted electronics damaged by water

    • 6 complaints (7%)
    • median 126,500 mi at 11.4 yrs old (6 state mileage, few)
    • 4 mention a crash, fire or injury
    • filed 2007–2018

    Owners describe electrical faults traced to the micro power module and related electronics mounted low in the trunk or spare tire well, where water collects. Symptoms include smoke and a burning electronics smell from the trunk area, loss of radio and iDrive functions, multiple warning lights and stalling or no-start conditions. Complaints attribute the water to rain entering through the trunk, a leaking sunroof drain or the trunk being opened in wet conditions; some owners note the module was relocated higher in the trunk as a remedy. Typically reported between about 100,000 and 190,000 miles, often after the car has been parked outside in rain.

    1 related service bulletin

    What to check: Open the trunk and lift the spare tire cover to look for water, corrosion or scorching around the module and wiring; check the sunroof drains and trunk seals, and ask whether the module has been relocated or replaced.

    2 excerpts from owner complaints in NHTSA records

    “I was driving on my way to work and started smelling something burning. All electrical warning lights started lighting up the dash and then displays go blank. Passenger compartment was filling up with smoke coming from under glove box. I pulled over and called fire department. We disconnected battery and took to Bmw. They said micro-processor located in spare tire storage area had shorted out due to water. I don't carry coolers and don't leave my trunk open when it rains. How did water get there. …”

    NHTSA complaint #10924120, filed 2016-11, 156,000 miles

    “There is a component called mpm(micro power module) beneath the spare tire and is completely burnt due to some water in the trunk. The plastic case which covers the component is burnt and there is clear indication of fire. Spoke to Bmw customer relations and they advised me to file a complaint here . Please look in to this issue as this may be hazardous.”

    NHTSA complaint #10534099, filed 2013-08, 97,000 miles

Buying note. Have any car you consider scanned for stored restraint and electrical fault codes before purchase, and confirm the passenger seat sensor, seat heaters and trunk electronics all behave correctly. Service history matters most here, especially transmission fluid work and any brake hydraulic repairs.

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. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the 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.

NHTSA recorded 84 consumer complaints for the 2004 BMW 525I. 72 of the complaints include a mileage, and 21% of those were filed for vehicles with under 50,000 miles; the median is 89,314 miles. Of all complaints, 17 a fire, 2 an injury, according to the filers. NHTSA lists 0 recall campaigns and 49 technical service bulletins for this model year.

Not compared (before 2008). Model years 2008–2023 of the same vehicle that have at least 25 complaints are compared, and a model needs at least 3 of them.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Also reported: Equipment (2), Exterior lighting (2), Steering (2), Visibility (wipers, defrost, mirrors) (2), Electronic stability control (1), Engine cooling (1), Latches, locks and linkages (1), Tires (1), Wheels (1).

Example complaints

Air bags: “Passenger restraint system warning appears each time we get into the vehicle and start the ignition. Airbag deployment red icon constantly illuminated on the dashboard. The air conditioning system is not working properly. The car does not cool or get cold until the car is in motion. We had a mechanic who we purchased the car from 3 years ago to diagnose the problem but it still continues to not cool properly.”

NHTSA complaint #11005486, filed 2017-07, 158,000 miles

Electrical system: “My navigation and radio system just stopped working and I had taken it to the dealership and they said that it was common for the car communications computer to go bad and that they would replace it for 1300.00 and the fact that it was common that the part went bad that often was confusing and I think should be a recall for that part.”

NHTSA complaint #10483811, filed 2012-11, 140,000 miles

Seats: “Driver's seat burned, leaving a charred hole in the leather approx 1 x 5 near drivers left hip area on seat back, most likely by seat heating element malfunction. The biggest concern is that this happened in june in maryland - - where it is hot. I did not have the seat heater on. This must have happened while the car was parked in my garage. This is very strange and deserves investigation.”

NHTSA complaint #10598747, filed 2014-06, 44,400 miles

Seat belts: “The seat belt and airbag warning light are on in car, based on my research, I've found that this is manufacture fault, when I called Bmw dealer they told me that my car is not covered under the recall campaign for the same manufacture fault. I think Bmw manufacturer is at libel at present, let's just hope nothing happened to myself and family while operating this vehicle. I want Bmw to add my car to the recall campaign because this is a safety issue.”

NHTSA complaint #10562431, filed 2014-01, 70,000 miles

Mileage when problems were reported

21% of the 72 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 51,653 and 119,000 miles.

4%0–104%10–2513%25–5019%50–7522%75–10022%100–15015%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (72 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 89,314 miles.

Complaints by year filed

Trend: stable. Complaints filed in the last 3 full calendar years are within 25% of the 3 years before.

’04’06’08’10’1211’1411’16’18
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Fuel economy and running cost

EPA ratings for each 2004 BMW 525I version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).

VersionEngineTransmissionCityHwyComb.Fuel / yr
525i RWD2.5L 6-cyl6-speed automatic192822$3,750
525i RWD2.5L 6-cyl6-speed manual172620$4,100
525i RWD2.5L 6-cyl6-speed automatic172620$4,100

Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.

Recalls and investigations

NHTSA lists no recall campaigns for the 2004 BMW 525I in the data used here. A recall can apply to some vehicles of a model year and not others, so check a specific vehicle by VIN at nhtsa.gov/recalls.

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 49 on record; the latest 10 are shown.

See all 49 bulletins →

Other model years of the BMW 525I

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
20077275,0002—22Not compared (before 2008)Falling
20067799,5003—21Not compared (before 2008)Falling
20053597,6250—20Not compared (before 2008)Rising
20048489,3140—20Not compared (before 2008)Stable
20033242,1882—21Not compared (before 2008)Falling
20022977,5004—20Not compared (before 2008)Falling
20012294,4954—20—Falling
199524112,0003—19—Falling
19947—4—19—Not enough data
19935230,0003—19—Not enough data
199218101,0004—18—Stable
199113137,7234—18—Not enough data
199011132,6003—18—Not enough data

All BMW 525I model years · Best and worst years by complaints

Frequently asked questions

What are the most common problems with the 2004 BMW 525I?

Owners of this model year most often report the passenger restraint warning light coming on and staying on, which dealers commonly trace to the front passenger seat occupancy sensor; many owners say they were told their car was not covered by the related 2008 air bag recall. The issues reported most often: Passenger restraint/air bag warning light stays on; Heated front seats overheat and burn the upholstery; Transmission failsafe message and loss of drive.

How many NHTSA complaints does the 2004 BMW 525I have?

NHTSA recorded 84 consumer complaints for the 2004 BMW 525I as of Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2004 BMW 525I is reported most often?

Air bags is named most often, in 33 complaints (39% of the total), followed by electrical system with 21.

Has the 2004 BMW 525I been recalled?

NHTSA lists no recall campaigns for this model year in the data used here. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

What gas mileage does the 2004 BMW 525I get?

The EPA rates the 2004 BMW 525I (525i, 2.5L 6-cyl) at 20 mpg combined, 17 city and 26 highway, with an estimated annual fuel cost of $4,100 at 15,000 miles a year. Other engine and drive versions are rated differently.

At what mileage are problems with the 2004 BMW 525I reported?

Among the 72 complaints that include a mileage, the median is 89,314 miles and the middle half falls between 51,653 and 119,000 miles; 21% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Fuel economy is from the EPA and DOE (fueleconomy.gov).

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.