The 1999 Ford Mustang has no open NHTSA recalls. Owners report 8 recurring issue clusters, led by “Spark plug ejection from cylinder head.” Ford uses the Intelligent Oil-Life Monitor (IOLM) to determine when oil changes are due based on actual driving load — not just mileage. Ford's published cap is 10,000 miles or 1 year, whichever comes first. The schedule below reflects Ford's Normal service intervals; F-Series trucks and Super Duty have additional towing-specific items.
No open recalls on file. NHTSA lists no unrepaired safety recalls for this year, make and model. A recall can be issued at any time, and a specific car can still have one open — check yours by VIN at nhtsa.gov/recalls.
What drivers and federal regulators have officially reported about the 1999 Ford Mustang.
ENGINE AND ENGINE COOLING
12 NHTSA complaints · 2005-08 → 2012-02
“I HAVE EXPERIENCED A SPARK PLUG BLOWOUT IN MY 1999 FORD MUSTANG WITH 4.6L V8”
“SLOWING DOWN FOR A STOP SIGN WHEN THE 3 RD SPARK PLUG BLEW OUT ON THE PASSENGER SIDE OF MY 1999 MUSTANG GT WITH A 4.6 V8”
“EVENTUALLY THE SPARK PLUG BLEW OUT OF THE HEAD STRIPPING THE TOP THREADS OUT OF THE ALUMINUM HEAD”
ENGINE AND ENGINE COOLING
14 NHTSA complaints · 2004-01 → 2014-07
“THE CONTACT PULLED OVER AND NOTICED A CRACK IN THE PLASTIC MANIFOLD AND COOLANT LEAKING FROM THE VEHICLE”
“PLASTIC INTAKE MANIFOLD CRACKED AT THERMOSTAT HOUSING, THUS ALLOWING ANTI-FREEZE TO LEAK ONTO THE ENGINE”
“THE VEHICLE WAS DRIVEN TO THE DEALERSHIP WHO DETERMINED THE INTAKE MANIFOLD WAS FRACTURED”
SEAT BELTS
17 NHTSA complaints · 2001-04 → 2011-04
“THE SEAT BELTS HAVE FAILED BY NOT RETRACTING ENOUGH NOR DOES IT SECURE THE PERSON PROPERLY”
“THE SEAT BELT FRONT RETRACTOR ON OUR 1999 FORD MUSTANG COBRA IS NOT FUNCTIONING PROPERLY”
“THE REAR PASSENGER SEAT BELTS DO NOT EXTRACT”
EXTERIOR LIGHTING
7 NHTSA complaints · 2002-04 → 2008-06
“THE PLASTIC LENS COVERINGS FOR THE HEADLIGHTS HAVE DISCOLORED AND TURNED MILKY IN APPEARANCE”
“THE HEADLAMP LENSES ON MY 1999 MUSTANG V-6 HAVE BECOME SO ETCHED THAT THEY FAIL TO PROPERLY ILLUMINATE FOR NIGHT OPERATION”
“THE FRONT HEAD LIGHT LENSES WERE MADE OF PLASTIC. THE PLASTIC LENSES TURNED TO A DARK COLOR WHICH TOOK AWAY 50% OF THE LIGHT STRENGTH”
PARKING BRAKE
13 NHTSA complaints · 2001-01 → 2006-10
“WHEN VEHICLE IS PARKED ON A SLIGHT INCLINE WITH PARKING BRAKE APPLIED VEHICLE WILL ROLL FORWARD”
“WITH EMERGENCY PARKING BRAKE ENGAGED, VEHICLE ROLLED DOWN DRIVEWAY AND CRASHED INTO ANOTHER VEHICLE, OWNER RECEIVED RECALL NOTICE (00V-349) DECEMBER 27,2000, PARKING BRAKE STILL FAULTY AFTER FOUR MONTHS, NO PARTS AVAILABLE”
“WHILE IN CHURCH, THE EMERGENCY BRAKE ON MY CAR FAILED, AND MY CAR ROLLED BACKWARDS, A BLOCK AND A HALF THROUGH AN INTERSECTION AND WAS HIT BY A CITY BUS, BEFORE LANDING AGAINST A TREE”
AIR BAGS
15 NHTSA complaints · 2001-03 → 2005-12
“THE VEHICLE WAS INVOLVED IN A FRONTAL COLLISION WHILE DRIVING AT 35 MPH. NONE OF THE AIR BAGS DEPLOYED UPON IMPACT”
“WHILE DRIVING ABOUT 60 MPH WAS INVOLVED IN A FRONTAL CRASH WITH ANOTHER VEHICLE. UPON IMPACT, FRONTAL AIR BAGS FAILED TO DEPLOY”
“WHILE DRIVING 45 MPH VEHICLE WAS INVOLVED IN A COLLISION, UPON IMPACT, FRONT AIR BAGS DID NOT DEPLOY”
VEHICLE SPEED CONTROL
11 NHTSA complaints · 2001-01 → 2011-02
“OCCASIONALLY, 5 TO 15 SECONDS AFTER I FIRST START MY 1999 MUSTANG GT, THE ENGINE WILL RAPIDLY INCREASE IN RPM AND THEN RETURN TO NORMAL”
“THE CAR LURCHES FORWARD OR BACKWARD WITHOUT WARNING AFTER PLACING IN GEAR”
“THE VEHICLE WILL SUDDENLY ACCELERATE TO 40 MPH WITHOUT GIVING ANY GAS”
ENGINE AND ENGINE COOLING
7 NHTSA complaints · 2001-04 → 2003-10
“CAR WILL KILL AT 10 MPH ALL OF A SUDDEN AND LEAVE ME WIT NO BRAKES OR STEERING”
“ENGINE STALLS INSTEAD OF IDLING WHEN VEHICLE IS STARTED, COMES TO REST OR DURING LOW SPEED MANEUVERS”
“WHILE DRIVING AT ANY SPEED VEHICLE COMPLETELY SHUTDOWN WITHOUT WARNING, NEARLY CAUSING SEVERAL COLLISIONS”
Issues on other model years
Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 20, 2026. Investigation data refreshed Sep 20, 2026.
We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.
Critical for safety and preventing major damage
Replace synthetic-blend or full-synthetic Motorcraft oil per the IOLM, or every 7,500-10,000 miles. EcoBoost engines require full synthetic; Coyote 5.0L V8 specifies SAE 5W-30.
Estimated cost — typical U.S. ranges
Dealer
~$120–$160
Shop
~$85–$115
DIY
~$25–$55
Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.
Rotate tires every 10,000 miles, or with every other oil change. F-150 4x4 owners should rotate every 5,000-7,500 miles to even out drivetrain bias wear.
Estimated cost — typical U.S. ranges
Dealer
~$85
Shop
~$60
DIY
Free
Often free at the shop where you bought the tires — worth asking before paying.
Inspect brake pads, rotors, and brake fluid level every 10,000 miles. Front pads on F-150 and Explorer typically last 40,000-60,000 miles.
Estimated cost — typical U.S. ranges
Dealer
~$85
Shop
~$60
DIY
Free
Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.
Ford specifies brake fluid replacement on an inspection basis, but moisture testing every 3 years is recommended. Replace if reading exceeds 3% water content.
Estimated cost — typical U.S. ranges
Dealer
~$180–$200
Shop
~$125–$140
DIY
~$10–$25
DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.
Keeps your vehicle running smoothly and efficiently
Replace the engine air filter every 30,000 miles. EcoBoost turbocharged engines are sensitive to airflow restriction — don't extend.
Estimated cost — typical U.S. ranges
Dealer
~$60–$95
Shop
~$45–$70
DIY
~$15–$40
5-minute job on most cars; the airbox lid usually has clips, no tools needed.
Ford 6R80, 10R80, and 8F transmissions use Mercon LV fluid rated 150,000 miles under normal service. Severe service (towing, plowing) drops this to 60,000 miles.
Estimated cost — typical U.S. ranges
Dealer
~$330–$500
Shop
~$235–$355
DIY
~$60–$180
Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.
F-Series and Expedition: replace rear axle fluid every 100,000 miles, or 50,000 miles if towing. Limited-slip rear ends require friction-modifier additive.
Estimated cost — typical U.S. ranges
Dealer
~$150–$195
Shop
~$105–$135
DIY
~$20–$50
Drain plug + fill plug — straightforward DIY. AWD vehicles have two; budget for both.
Iridium spark plugs on Coyote 5.0L, EcoBoost 2.7L/3.5L, and 2.3L are rated 100,000 miles. EcoBoost engines: never exceed the interval — gap erosion causes coil failure.
Estimated cost — typical U.S. ranges
Dealer
~$285–$390
Shop
~$200–$275
DIY
~$25–$100
Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.
Motorcraft Orange (Dex-Cool compatible) coolant: first change at 100,000 miles, then every 50,000. Older trucks with Yellow Motorcraft coolant: 50,000 miles throughout.
Estimated cost — typical U.S. ranges
Dealer
~$285–$330
Shop
~$200–$235
DIY
~$25–$60
Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.
Extends the life of your vehicle and improves comfort
Replace the cabin air filter every 20,000 miles. On F-150, located behind the glove box; on Escape and Explorer, accessed from the passenger footwell.
Estimated cost — typical U.S. ranges
Dealer
~$60–$95
Shop
~$45–$70
DIY
~$15–$40
Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.
Occupant deaths in fatal crashes (FARS)
391 crashes 1990–2024
How the 391 occupant deaths break down
273
driver deaths
117
passenger deaths
1
not recorded by seat
391
occupant deaths
Crash years covered: 1990–2024 This model year first appears in 1999 crashes. Older models have had more years on the road to appear in these crashes, so a higher count here does not by itself mean a vehicle is less safe.
FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road. How to read this number
FARS 2024 data is an annual report file. NHTSA revises these records when the final file is published, so this count can change.
Every vehicle has exactly one driver seat, so driver deaths line up fairly when you compare one model to another. Occupant deaths include passengers, so a three row SUV can show a higher number than a two seat car simply because it carries more people.
Both figures are plain counts, not rates. A rate would need to know how many of each vehicle are on the road, and that registration data is not public, so we do not publish rates or scores of any kind.
IIHS publishes driver death rates using this same driver only idea, paired with a registered vehicle years denominator we do not have. Their rates and these counts answer different questions, so do not read either number here as a safety rating.
Owner-reported problem signals
Separate from the federal fatality data above: complaints owners filed with NHTSA about this year and model. These are reports of problems, unverified, and are counted here only as signals.
56
complaints mentioning a crash
5
complaints mentioning a fire
Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.
How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.
This maintenance schedule for the 1999 Ford Mustang reflects Ford's published service intervals and the Intelligent Oil-Life Monitor system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.