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Oldsmobile Alero 1999–2004
Only generation · GM N-body (GMX130)
NHTSA data through 13 August 20262,936 complaints, 1,580 with mileageMethod
- Reports with mileage
- 1,580
- Median of reported failures
- 68,000 mi
- Most-reported system
- Electrical system (21.5%)
- Recalls
- 1
Before-you-buy checklist ↓Check this VIN — NHTSA ↗
On this generation, failures are spread across the mileage range, with the middle half between 42,925 and 105,000 miles.
Figure 1 · Oldsmobile Alero 1999–2004 · 1,580 reports with mileage
Mileage at failure
Complaints per 5,000-mile bin, 0 to 200,000 miles, equal bins on a linear scale. Tallest bar = 107 complaints.
- Rest of the range
- Median
- 200,000+ — 38 complaints (2.4%), plotted separately
- 10%
- 22,000
- 25%
- 42,925
- Median
- 68,250
- 75%
- 105,000
- 90%
- 145,000
Show the numbers
| Mileage | Complaints | Share |
|---|---|---|
| 0–5,000 | 45 | 2.8% |
| 5,000–10,000 | 22 | 1.4% |
| 10,000–15,000 | 32 | 2.0% |
| 15,000–20,000 | 25 | 1.6% |
| 20,000–25,000 | 56 | 3.5% |
| 25,000–30,000 | 35 | 2.2% |
| 30,000–35,000 | 55 | 3.5% |
| 35,000–40,000 | 60 | 3.8% |
| 40,000–45,000 | 84 | 5.3% |
| 45,000–50,000 | 68 | 4.3% |
| 50,000–55,000 | 73 | 4.6% |
| 55,000–60,000 | 60 | 3.8% |
| 60,000–65,000 | 107 | 6.8% |
| 65,000–70,000 | 79 | 5.0% |
| 70,000–75,000 | 71 | 4.5% |
| 75,000–80,000 | 61 | 3.9% |
| 80,000–85,000 | 78 | 4.9% |
| 85,000–90,000 | 44 | 2.8% |
| 90,000–95,000 | 38 | 2.4% |
| 95,000–100,000 | 49 | 3.1% |
| 100,000–105,000 | 40 | 2.5% |
| 105,000–110,000 | 27 | 1.7% |
| 110,000–115,000 | 37 | 2.3% |
| 115,000–120,000 | 28 | 1.8% |
| 120,000–125,000 | 27 | 1.7% |
| 125,000–130,000 | 40 | 2.5% |
| 130,000–135,000 | 30 | 1.9% |
| 135,000–140,000 | 28 | 1.8% |
| 140,000–145,000 | 21 | 1.3% |
| 145,000–150,000 | 8 | 0.5% |
| 150,000–155,000 | 23 | 1.5% |
| 155,000–160,000 | 20 | 1.3% |
| 160,000–165,000 | 15 | 0.9% |
| 165,000–170,000 | 6 | 0.4% |
| 170,000–175,000 | 11 | 0.7% |
| 175,000–180,000 | 6 | 0.4% |
| 180,000–185,000 | 12 | 0.8% |
| 185,000–190,000 | 12 | 0.8% |
| 190,000–195,000 | 3 | 0.2% |
| 195,000–200,000 | 6 | 0.4% |
| 200,000+ | 38 | 2.4% |
Source: NHTSA Office of Defects Investigation, public domain. Complaint counts reflect what owners reported and are not a measure of failure rate per vehicle sold.
What this can and cannot tell you: these are complaints owners chose to file, not a failure rate. Popular models accumulate more of them simply by being common. How this is built.
Owners filed 2,936 complaints with NHTSA about the 1999–2004 Oldsmobile Alero, and 1,580 of them record the mileage at which the failure happened. That is enough to show not just what fails, but when.
Failures are spread across the mileage range, with the middle half between 42,925 and 105,000 miles. The median is 68,250 miles.
The most-reported areas are the electrical system (21.5% of complaints, typically around 85,000 miles), the exterior lighting (14.3% of complaints, typically around 65,000 miles), the hydraulic brake circuit (12.4% of complaints, typically around 35,000 miles).
1 recall campaign cover this generation.
If you arrived asking “is it reliable?” — this page answers the version of that question the data can support: which problems owners reported, and at what mileage.
How many miles does a 1999–2004 Oldsmobile Alero last?
Half of the failure reports on the 1999–2004 Oldsmobile Alero were filed by 68,000 miles and 90% by 145,000 miles — figures drawn from 1,580 NHTSA complaints that record an odometer reading, so they time reported failures, not the cars whose owners never filed one.
38 reports (2.4%) came in past 200,000 miles — each one proof a Alero reached that mileage, not that it died there.
Before you buy a 1999–2004 Alero: the 3-minute check
Generated from 1,580 mileage-tagged complaints, 1 recall campaign, 3 documented problem areas. Print this page — the checklist survives print.
- Run the VIN at nhtsa.gov/recalls. 1 campaign cover this generation; an open recall is a free repair you can make the seller's problem.
- Check engine - intake manifold on 1999–2004 (3.4L V6) cars. 3.4L LA1 lower intake manifold gasket failure allowing coolant into the oil or external coolant leaks; tied to the Dex-Cool-era nylon/silicone gasket design shared across GM 3.1L/3.4L 60-degree V6s. Often precedes…
- Check electrical - anti-theft on 1999–2004 cars. Passlock II ignition-cylinder sensor degradation causing intermittent crank-no-start with security lamp.
- Check hvac on 1999–2004 cars. Blower motor resistor / control failure leaving the fan stuck on one speed or dead.
- Complaint reports are not spread evenly across model years here — see the by-model-year table below before you settle on a year.
- End with a pre-purchase inspection of this car. Aggregate data describes the population; the example in front of you has its own history.
For a buyer, failures on this generation are spread rather than concentrated: the middle half falls between 43,000 and 105,000 miles, with a median of 68,000. There is no single mileage threshold to watch, which means condition and maintenance records are more informative than the odometer.
On inspection, the electrical system and the exterior lighting are where this generation's reports concentrate, so those are the areas worth a specific look. The exterior lighting in particular shows a median failure mileage of 65,000, which gives a concrete number to compare against the odometer of any car you are considering.
None of this is a substitute for a pre-purchase inspection on the individual car. Aggregate patterns describe a population; the example in front of you has its own history.
What fails, and when
Figure 2 · Oldsmobile Alero 1999–2004
When each system fails
Bar spans the middle half of reports; the notch inside each bar is the median. Miles at failure on a proportional scale — equal distances are equal ratios, not equal miles.
- Hydraulic brake circuit364 reports35,00020,000–65,000Hydraulic brake circuit: 364 reports, median 35,000 miles, middle half 20,000 to 65,000 miles.
- Engine and its cooling system269 reports60,00040,000–79,000Engine and its cooling system: 269 reports, median 60,000 miles, middle half 40,000 to 79,000 miles.
- Visibility equipment178 reports63,00041,000–84,000Visibility equipment: 178 reports, median 63,000 miles, middle half 41,000 to 84,000 miles.
- Suspension112 reports64,00044,000–80,000Suspension: 112 reports, median 64,000 miles, middle half 44,000 to 80,000 miles.
- Exterior lighting420 reports65,00047,000–97,000Exterior lighting: 420 reports, median 65,000 miles, middle half 47,000 to 97,000 miles.
- Airbag system103 reports75,00044,000–125,000Airbag system: 103 reports, median 75,000 miles, middle half 44,000 to 125,000 miles.
- Electrical system630 reports85,00056,000–128,000Electrical system: 630 reports, median 85,000 miles, middle half 56,000 to 128,000 miles.
- Your odometer — appears after you enter it in “Where your car sits”
Ordered by median mileage, earliest first. The first 12,000 miles are shaded: that is the boundary this site uses between a manufacturing defect and ordinary wear, not a property of the world.
Source: NHTSA Office of Defects Investigation, public domain.
| System | Complaints | Share | Median | 25–75% |
|---|---|---|---|---|
| Electrical system | 630 | 21.5% | 85,000 | 56,000–128,000 |
| Exterior lighting | 420 | 14.3% | 65,000 | 47,000–97,000 |
| Hydraulic brake circuit | 364 | 12.4% | 35,000 | 20,000–65,000 |
| Engine and its cooling system | 269 | 9.2% | 60,000 | 40,000–79,000 |
| Visibility equipment | 178 | 6.1% | 63,000 | 41,000–84,000 |
| Suspension | 112 | 3.8% | 64,000 | 44,000–80,000 |
| Airbag system | 103 | 3.5% | 75,000 | 44,000–125,000 |
| Fuel system | 101 | 3.4% | 70,000 | 49,000–96,000 |
| Steering | 100 | 3.4% | 90,000 | 48,000–130,000 |
| Body structure | 95 | 3.2% | 50,000 | 29,000–80,000 |
Where your car sits
Failure reports by the odometer reading they were filed at. Pick the anchor nearest your car — or type the exact mileage: your marker lands on this curve and on the timing chart above.
Figure 3 · Oldsmobile Alero 1999–2004 · 1,580 reports with mileage
Share of reports below each mileage
Share of mileage-tagged reports filed at or below each odometer reading. Steps rise only at bin edges, by exact counted shares.
- 60,000 mi — 39% of reports below
- 90,000 mi — 67% of reports below
- 120,000 mi — 81% of reports below
- Median — the staircase crosses the 50% line here
- Your odometer — appears after you enter it below
The staircase tops out at 98%: the remaining 2.4% of reports (38) came above 200,000 miles.
Nothing is smoothed or interpolated. Linear axis, same as Figure 1.
Source: NHTSA Office of Defects Investigation, public domain.
At 60,000 miles
39% of the failure reports on this generation came below this mileage. That describes reports, not your odds.
In the reporting window
- Electrical system — middle half 56,000–128,000 mi
- Exterior lighting — middle half 47,000–97,000 mi
- Hydraulic brake circuit — middle half 20,000–65,000 mi
- Engine and its cooling system — middle half 40,000–79,000 mi
- Visibility equipment — middle half 41,000–84,000 mi
- Suspension — middle half 44,000–80,000 mi
- Airbag system — middle half 44,000–125,000 mi
At 90,000 miles
67% of the failure reports on this generation came below this mileage. That describes reports, not your odds.
Reported earlier than this mileage — ask for repair records
- Hydraulic brake circuit — median 35,000 mi
- Engine and its cooling system — median 60,000 mi
- Visibility equipment — median 63,000 mi
- Suspension — median 64,000 mi
In the reporting window
- Electrical system — middle half 56,000–128,000 mi
- Exterior lighting — middle half 47,000–97,000 mi
- Airbag system — middle half 44,000–125,000 mi
At 120,000 miles
81% of the failure reports on this generation came below this mileage. That describes reports, not your odds.
Reported earlier than this mileage — ask for repair records
- Exterior lighting — median 65,000 mi
- Hydraulic brake circuit — median 35,000 mi
- Engine and its cooling system — median 60,000 mi
- Visibility equipment — median 63,000 mi
- Suspension — median 64,000 mi
In the reporting window
- Electrical system — middle half 56,000–128,000 mi
- Airbag system — middle half 44,000–125,000 mi
Which systems, and when
Complaints about this generation are not spread evenly across the vehicle, and the systems that generate the most of them do not all fail at the same point in a car's life. The median failure across all systems here is 68,250 miles; the figures below show which parts of the car run ahead of that and which run behind.
The electrical system accounts for 21.5% of complaints (630 reports, 386 of them with a mileage figure), with a median of 85,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 56,000 and 128,000 miles.
The exterior lighting accounts for 14.3% of complaints (420 reports, 289 of them with a mileage figure), with a median of 65,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 47,000 and 97,000 miles.
The hydraulic brake circuit accounts for 12.4% of complaints (364 reports, 101 of them with a mileage figure), and it fails early — a median of 35,000 miles, well before the vehicle's overall median. Failures clustered this far below the rest of the car usually point to a design or manufacturing problem rather than wear, because wear does not selectively target one system on low-mileage examples. The middle half of these reports falls between 20,000 and 65,000 miles.
The engine and its cooling system accounts for 9.2% of complaints (269 reports, 159 of them with a mileage figure), with a median of 60,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 40,000 and 79,000 miles.
Visibility equipment accounts for 6.1% of complaints (178 reports, 85 of them with a mileage figure), with a median of 63,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 41,000 and 84,000 miles.
The suspension accounts for 3.8% of complaints (112 reports, 60 of them with a mileage figure), with a median of 64,000 miles, close to the vehicle's overall pattern. The middle half of these reports falls between 44,000 and 80,000 miles.
Differences between model years
Within this generation, complaint volume is not constant across model years. The 2000 model year drew the most — 810 complaints — while 2004 drew the fewest at 175. The median year sits at 477.
Recalls and what they cover
NHTSA records 1 recall campaign covering vehicles in this generation. A recall means the manufacturer or the regulator concluded there was a safety defect or a standard was not met, and that a free remedy is owed to owners — including second and later owners.
Recall status is specific to the individual vehicle, not the model. Checking a VIN against NHTSA's lookup is free and takes under a minute, and it is the only way to know whether a particular car has had the work done.
Reported severity
What owners reported alongside the failure itself, out of 2,936 complaints against this generation:
- Crashes
- 126 (4.3%)
- Fires
- 43
- Injury reports
- 90
- Fatality reports
- 7
These flags are self-reported by complainants and unverified by NHTSA; one report can carry several flags, so the counts overlap and do not sum to a total. They are not adjusted for how many of these vehicles are on the road. No chart is drawn here on purpose: overlapping counts spanning very different magnitudes cannot be honestly encoded as lengths.
Documented problems
Engine - Intake Manifold 1999–2004 (3.4L V6)
3.4L LA1 lower intake manifold gasket failure allowing coolant into the oil or external coolant leaks; tied to the Dex-Cool-era nylon/silicone gasket design shared across GM 3.1L/3.4L 60-degree V6s. Often precedes overheating and head gasket damage.
Electrical - Anti-Theft 1999–2004
Passlock II ignition-cylinder sensor degradation causing intermittent crank-no-start with security lamp.
Hvac 1999–2004
Blower motor resistor / control failure leaving the fan stuck on one speed or dead.
By model year
| Year | Complaints | With mileage |
|---|---|---|
| 1999 | 702 | 253 |
| 2000 | 810 | 410 |
| 2001 | 549 | 313 |
| 2002 | 406 | 275 |
| 2003 | 294 | 203 |
| 2004 | 175 | 126 |
Recalls (1) — is your car included?
Sep 2014 · 1999–2004 · Electrical SystemIf the key is not in the run position, the air bags may not deploy if the vehicle is involved in a crash…
The defect. This defect can affect the safe operation of the airbag system. Until this recall is performed, customers should remove all items from their key rings, leaving only the ignition key. The key fob (if applicable), should also be removed from the key ring. General Motors LLC (GM) notified the agency on July 3, 2014, that they are recalling 5,877,718 model year 2000-2005 Chevrolet Impala and Monte Carlo, 1997-2003 Chevrolet Malibu, 2004-2005 Malibu Classic, 1999-2004 Oldsmobile Alero, 1998-2002 Oldsmobile Intrigue, 1999-2005 Pontiac Grand Am and 2004-2008 Pontiac Grand Prix vehicles. In the
What can happen. If the key is not in the run position, the air bags may not deploy if the vehicle is involved in a crash, increasing the risk of injury.
The free fix. GM will notify owners, and dealers will install two key rings and an insert in the key slot or a cover over the key head on all ignition keys, free of charge. The recall began on September 9, 2014. GM's number for this recall is 14350.
What owners reported
I bought this vehicle new in florida...From day 1 there has been excessive wind noise coming from the driver side of the vehicle. It sounds like a window is left open. Took to various service dealership to complain of this problem...Various things have been done by the service dept., But the problem still persist.…
1999 · 10 miles · Body structure
Bought the vehicle new in florida...From day one, the parking brake has never worked right...Will not hold the vehicle on a hill when parking brake lever fully engaged. Took the vehicle to dealer service centers several times...Parking brake would work for a few weeks, but would return to previous state of not…
1999 · 10 miles · Parking brake
Occasionally, vehicle will not start after sitting for about an hour...Vehicle will try to start...Tachometer will fluctuate, but the engine ends up stalling. In order to start the vehicle, the ignition key has to be held in the start position longer than usual...About 5 seconds. Took to various dealer service dept.…
1999 · 5,000 miles · Transmission and driveline
On the way from work one day after a rain shower, i use the power driver window to roll down the window for some fresh air. When i power rolled up the window, there were deep scratches on various places on the window. TSB#98831520 took to dealer service dept to repair under warranty. It was fixed but three days later…
1999 · 8,000 miles · Visibility equipment
Built from 1,580 NHTSA complaints with mileage · snapshot 2026-08-18 · open data · reproduce this page