The 1991 Jeep Wrangler has no open NHTSA recalls. Owners report 6 recurring issue clusters, led by “Fuel tank and sending unit gasket leaks.” Jeep vehicles use the Oil Change Indicator system to signal when oil is due. Wrangler and Gladiator owners who actually use 4WD off-road should treat the schedule below as Schedule A (severe) — water crossings, sand, and rock crawling demand differential and transfer case service at half the published intervals. Grand Cherokee and Cherokee follow the standard Mopar schedule.
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 1991 Jeep Wrangler.
FUEL SYSTEM, GASOLINE
10 NHTSA complaints · 1995-05 → 2015-05
“GASKET AROUND GAS TANK IS CRACKED AND FUEL LEAKS OUT WHEN MAKING A RIGHT TURN”
“PLASTIC FUEL TANK LEAKS FROM FUEL SENDING UNIT GASKET; TANK IS WARPED FROM BOTTOM UP”
“FUEL TANK SENDING UNIT GASKET CRACKED AND WAS REPLACED”
SEAT BELTS
12 NHTSA complaints · 1995-03 → 2005-12
“VEHICLE DRIVER SIDE SHOULDER BELT BUCKLE IS INOPERATIVE. BUCKLE WILL NOT STAY LATCHED”
“SEAT BELT CAME UNLATCHED DURING HEAVY BRAKING OFFERING NO PROTECTION, NOW DO NOT LATCH AT ALL, PASSENGER STARTING TO DO THE SAME”
“SHOULDER BELT RETRACTOR WILL NOT RETRACT TIGHTLY WHEN LEAVING THE VEHICLE, CAUSING THE BELT TO BE CAUGHT INSIDE OF THE DOOR AROUND THE FRAME”
POWER TRAIN
5 NHTSA complaints · 1995-03 → 2001-09
“WHEN THIS HAPPENS CLUTCH BECOMES INOPERABLE”
“THE HYDRAULIC RELEASE BEARING CLUTCH LEAKS FLUID INTO THE BELL HOUSING, MAKING IT HARD TO SHIFT OUT OF A GEAR”
PARKING BRAKE
12 NHTSA complaints · 1995-12 → 2004-01
“AFTER PARKING THE VEHICLE, THE PARKING BRAKE RELEASED. THIS CAUSED THE VEHICLE TO ROLL BACKWARDS, INTO A LAKE”
“EMERGENCY PARKING BRAKE RELEASES ON IT OWN WHEN NOT ATTENDED, VEHICLE WILL ROLL AWAY”
“EMERGENCY BRAKE RELEASED AFTER 15-20 SECONDS, CAUSING AN ACCIDENT”
ENGINE AND ENGINE COOLING
9 NHTSA complaints · 1997-05 → 1998-03
“THE VALVE COVER AND ENGINE GASKET ARE EXPERIENCING OIL LEAKS WHICH COULD CAUSE A FIRE”
“ENGINE HEAD GASKET/VALVE COVER GASKET FAILED DUE TO DESIGN FLAW, CAUSING GAS TO LEAK”
“ENGINE VALVE COVER GASKET FAILED”
ELECTRICAL SYSTEM
3 NHTSA complaints · 1996-09 → 1997-02
“OWNER STATES THAT ELECTRICAL HARNESS CAUGHT ON FIRE, OWNER IS CONCERNED FOR HER SAFETY”
“WHILE DRIVING THE COMPUTER CHIP THAT RUNS THE ELECTRICAL SYSTEM WENT OUT, CAUSING AN ELECTRICAL FIRE”
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
Pentastar 3.6L: SAE 0W-20 every 8,000 miles. Wrangler 392 6.4L HEMI: SAE 5W-20 every 8,000 miles. EcoDiesel 3.0L: 10,000 miles. 4xe plug-in hybrid: 8,000 miles or annually.
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 8,000 miles. Wrangler with 33+ inch off-road tires: rotate every 5,000 miles to prevent uneven wear from solid axles.
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 pads, rotors, and parking brake every 8,000 miles. Wrangler and Gladiator pads wear faster than Grand Cherokee due to higher curb weight per axle.
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.
Replace front differential fluid every 60,000 miles. Wrangler off-road use (water crossings, sand): inspect every 30,000 miles for water contamination.
Estimated cost — typical U.S. ranges
Dealer
~$150–$195
Shop
~$105–$135
DIY
~$20–$50
Rear axle fluid every 60,000 miles. Limited-slip differentials require Mopar friction modifier. Wrangler Rubicon with locking differentials: same schedule.
Estimated cost — typical U.S. ranges
Dealer
~$150–$195
Shop
~$105–$135
DIY
~$20–$50
Replace transfer case fluid every 60,000 miles. Use Mopar ATF+4 for NV3500 and NV245. Wrangler Rock-Trac: 60,000 mi normal, 30,000 mi with regular off-road use.
Estimated cost — typical U.S. ranges
Dealer
~$105–$140
Shop
~$75–$100
DIY
~$15–$40
AWD/4WD vehicles only. Easy drain-and-fill on most platforms.
Replace DOT 3 brake fluid every 2 years regardless of mileage. Wrangler off-road use accelerates moisture intake — annual fluid testing recommended.
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
Severe service: ZF 8HP fluid every 60,000 miles. Normal: 120,000 miles. Use Mopar ATF+4 — never substitute.
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.
Replace engine air filter every 30,000 miles. Wrangler driven in dust or sand: inspect at every oil change and replace early.
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.
Pentastar 3.6L: 16 spark plugs total, replace at 100,000 miles. Wrangler 392 6.4L HEMI: 16 plugs at 100,000 miles. EcoDiesel: glow plug inspection only.
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.
Mopar HOAT (purple) for gas engines: first change at 100,000 miles, then every 50,000. Do not mix with green or orange coolants.
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 cabin air filter every 20,000 miles. Grand Cherokee, Cherokee, and Compass: behind the glove box. Wrangler/Gladiator: optional cabin filter on later models only.
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)
152 crashes 1990–2024
How the 152 occupant deaths break down
100
driver deaths
51
passenger deaths
1
not recorded by seat
152
occupant deaths
Crash years covered: 1990–2024 This model year first appears in 1991 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.
4
complaints mentioning a crash
3
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 1991 Jeep Wrangler reflects Jeep's published service intervals and the Oil Change Indicator 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.