JeepWrangler20032.4L/jeep/wrangler/2003/2-4l/
TJ platform

2003 Jeep Wrangler — 2.4L

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 Wrangler 2.4L.

Body SUVEngine 2.4LTransmission Automatic 4-spd

The 2003 Jeep Wrangler 2.4L is a compact SUV built on the TJ platform, equipped with a 2.4-liter four-cylinder engine paired to a four-speed automatic transmission and requiring 4 quarts of 10W-30 API oil for service. This model achieves EPA fuel economy ratings of 16 mpg city, 18 mpg highway, and 17 mpg combined. During its model year, the Wrangler accumulated 102 owner complaints primarily concentrated in the Power Train category, alongside four safety recalls. Positioned within the Wrangler's complaint history spanning from 1990 to 2023, the 2003 model falls between the record-low of 5 complaints in 1996 and the peak of 1,793 in 2018, indicating moderate reliability performance relative to the nameplate's long-term service record.

Model year2006200520042003

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacity4 qt w/ filterOEM · verified
Engine oil type10W-30 APIOEM · verified
Lug nut torque85-110 ft-lbsOEM · verified
EPA fuel economy16/18/17 mpgEPA · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 34 · 600 CCA battery, OE oil filter 05281090AB. Note the factory fuel filter and front wiper blades are now discontinued — plan on a superseded or quality aftermarket equivalent, which the part pages below list where known. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 34 · 600 CCAOEM · verified
Tire sizeLT245-75R16OEM · verified
Wheel / rim8 inOEM · verified

OE service part numbers OEM · verified

Engine oil filter05281090AB alt 04105409AE
Engine air filter04797777AC alt 05019443AA
Fuel filter04798301 discontinued
Spark plugSP000ZFR5N alt 68307021AA
Battery1BPB5800AA
Front wiper blades55154762AF discontinued
Serpentine belt04854033AC alt 05281351AC
Thermostat52028186AC alt 53010552AC

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic 4-spd

Ratings & economy EPA / vPIC

EPA city / highway / combined16 / 18 / 17 mpg
Drivetrain4-Wheel or All-Wheel Drive
Recommended fuelRegular Gasoline

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds 4 qt w/ filter of 10W-30 API engine oil, 80W-90 · GL-5 · SYNTHETIC in the differential, DOT 3 brake fluid. Torque lug nuts to 85-110 ft-lbs, the oil drain plug to 20.0 ft-lbs. The firing order is 1-5-3-6-2-4.

Lubricants & capacities

Brake FluidDOT 3
Differential Gear Oil80W-90 · GL-5 · SYNTHETIC
Differential Gear Oil Capacity4 pints, mvc front, non_mvc 216
Engine CoolantHOAT · MS9769
Engine Oil10W-30 · API
Engine Oil Capacity4 qt w/ filter
Power Steering FluidATF +4
Power Steering FluidMS-5931

Engine torques

Camshaft Bearing/Carrier Cap Bolts or StudsM6 Bolts: 9 ft-lbs, M8 Bolts: 18 ft-lbs
Crankshaft Pulley and/or Damper Bolts100 ft-lbs
Engine Flywheel Bolts70 ft-lbs
Intake Manifold to Engine Bolts20.8 ft-lbs
Exhaust Manifold to Cylinder Head Bolts14.5 ft-lbs
Engine Oil Pan Drain Plug20.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs21 ft-lbs

Chassis torques

Lug Nuts85-110 ft-lbs
Transfer Case Fill PlugSteel case: 35.0, Aluminum case: 18.0 ft-lbs
Transfer Case Drain PlugSteel case: 35.0, Aluminum case: 18.0 ft-lbs
Front Wheel Hub175 ft-lbs

Ignition

Cylinder Firing Order1-3-4-2
Cylinder Firing Order1-5-3-6-2-4
Ignition Coil Primary Resistance.51-.61 ohms
Ignition Coil Secondary Resistance11,500-13,500 ohms
Spark Plug ManufacturerChampion
Spark Plug Gap0.048-0.053 in
Spark Plug Torque11.0 ft-lbs

Battery & A/C

RefrigerantR134a
Refrigerant Capacity1.25 lbs
Oil GroupPAG
Oil TypeND 8 oil
Oil Capacity6.10 oz
Standard BCI Group Number34
Standard BCI Cranking Performance600 cca

Service checks

Pressure Test18 psi
Radiator Cap Pressure Relief18-21 psi
Thermostat Opening Temperature192-199 °F
Regulated Fuel System Pressure (With Vacuum)47-51 psi
Engine Compression120-150 PSI. 30 Maximum variation PSI.
Engine Oil Pressure4 psi @ Idle, 25-80 psi @ 3000 rpm psi
Intake Valve LashHydraulic in
Exhaust Valve LashHydraulic in

Brakes

Torque Caliper to Bracket11 ft-lbs / 18 ft-lbs
Minimum Pad Thickness0.030 in
Minimum Shoe Thickness0.030
Rotor Max Parallel Variation0.0005 in / 0.0007 in
Rotor Runout Limit0.005 in / 0.004 in
Rotor Nominal Thickness From0.94 in / 0.472 in
Rotor Nominal Thickness To0.94 in / 0.472 in
Rotor Minimum Machining0.894 in / 0.433 in

Multi-step torque procedures OEM · verified

Connecting Rod (Large End) Bearings — tightening sequence 1 stages
115 ft. lbs., Step 2: 9015 ft. lbs
Cylinder Head — tightening sequence 4 stages

Prep Coat bolt threads with clean engine oil

125 ft. lbs.25 ft. lbs
250 ft. lbs.50 ft. lbs
350 ft. lbs.50 ft. lbs
490
Main Bearings — tightening sequence 1 stages
120 ft. lbs., Step 2: 4520 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 6,000 mi; spark plugs every 30,000 mi; coolant at 102,000 mi. The big-interval services (at 102,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

Every 6,000 miEngine Oil (drain & refill) · Engine Oil Filter (replace) · Steering Linkage (inspect) · Tie Rod (inspect)
Every 7,500 miTire & Wheel Assembly (rotate)
Every 15,000 miAccessory Drive Belt (inspect) · Suspension Ball Joint (inspect)
Every 18,000 miBrake Linings (inspect)
Every 30,000 miEngine Air Filter Element (replace) · Spark Plugs (inspect) · Spark Plugs (replace)
At 60,000 miAccessory Drive Belt (inspect) · Spark Plugs (inspect)
Every 60,000 miPCV Valve (inspect) · Spark Plug Wires (replace)
At 102,000 miBands (adjust) · Engine Coolant System (drain, flush & refill) · Transmission Fluid & Filter (replace)
At 120,000 miTiming Belt (replace) · Transfer Case Assembly (drain & refill)

Owner how-tos

Condensed service procedures for routine maintenance. Procedures that require dealer diagnostic equipment are identified and summarized only.

Common procedures

Key fob — remote (RKE) programming programming new fob buttons Dealer tool OEM · verified
Tool requiredDRBIII scan tool (dealer / locksmith)
WhyTransmitter codes are written into the receiver in the passenger door module
Anti-theft (SKIS) — module initialization after immobilizer module replacement Dealer tool OEM · verified
When neededAfter Sentry Key Immobilizer Module (SKIM) replacement
Tool requiredDRBIII scan tool
Also requiredThe vehicle's four-digit PIN code

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

The 2003 Jeep Wrangler sits at the bottom of a multi-year complaint trough within the TJ-generation arc: after 2001–2002 posted 177 and 108 complaints respectively, 2003 recorded just 102 NHTSA complaints, 4 recalls, and 0 investigations, while 2004 nearly doubled to 192 complaints and 20052006 spiked to 649 and 730. Its 55 TSBs were modestly higher than the 43–47 seen in 2001–2004, but its recall count was lower than 2001–2002 and its investigation count remained at zero. Reported grievances clustered in Power Train (16), Suspension (11), Steering (7), and Fuel System (7), with 8 crash-related and 3 fire-related complaints, though the federal data does not specify root causes. Relative to the sharp escalation that followed, 2003 represents a comparatively quiet year in the record. For a used TJ Wrangler, the 2003 model year is one of the more favorable choices in this generation based on the federal record alone, provided a pre-purchase inspection confirms the powertrain, suspension, steering, and fuel systems are in sound condition.

4
Open recalls
NHTSA campaigns
55
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
102
Owner complaints
8 involved a crash · 3 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Rollover★★★★★

Owner complaints filed with NHTSA, by component

All 102 complaints on record, top 8 components.

Power Train16
Suspension11
Steering7
Fuel System, Gasoline7
Air Bags6
Steering,Suspension6
Seat Belts6
Electrical System5

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 4 campaigns on record for this vehicle.

06E022000Service Brakes, HydraulicReported 13/03/2006

CERTAIN AFTERMARKET BRAKE HYDRAULIC MASTER CYLINDERS SOLD AS REPLACEMENT BRAKE CYLINDERS FOR CERTAIN FORD, DAIMLERCHRYSLER, AND JEEP PASSENGER VEHICLES. THESE BRAKE CYLINDERS WERE SOLD UNDER THE BRAND NAMES OF NAPA… Remedy: AFFINIA (BRAKE PARTS, INC.) WILL REPLACE THE SUBJECT BRAKE HYDRAULIC MASTER CYLINDERS FREE OF CHARGE. THE RECALL BEGAN ON MARCH 20, 2006. OWNERS CAN CONTACT AFFINA GROUP CUSTOMER…

06E026000Exterior LightingReported 23/03/2006

CERTAIN PRO-A MOTORS CORNER LAMPS, TURN SIGNALS, AND HEADLIGHTS SOLD AS REPLACEMENT LAMPS FOR USE ON CERTAIN PASSENGER VEHICLES LISTED ABOVE. SOME COMBINATION LAMPS THAT ARE NOT EQUIPPED WITH AMBER SIDE REFLECTORS FAIL… Remedy: PRO-A MOTORS WILL NOTIFY OWNERS AND OFFER TO REPURCHASE THE LAMPS. THE RECALL BEGAN ON APRIL 3, 2006. OWNERS MAY CONTACT PRO-A MOTORS AT 323-838-2988.

Technical service bulletins NHTSA · verified

Showing 5 of 55 bulletins on record with NHTSA.

BulletinDateComponentSummary
1012322024-10-29Power TrainPlate - Planetary
90042752020-07-22Electrical SystemKEY, Master If replacing the key/FOBIK on a WJ, KJ, TJ, or PT Cruiser, use the "AC" NIC…
90042752020-07-22Electrical SystemKEY, Master If replacing the key/FOBIK on a WJ, KJ, TJ, or PT Cruiser, use the "AC" NIC…
S20250000052020-06-01Electrical SystemMalfunction Indicator Lamp (MIL) Illumination. Diagnostic Trouble Codes P0407 ? EGR…
23-015-202020-04-30EquipmentDisinfectant Solution Recommended for COVID-19

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420
Catalyst system efficiency below threshold — Bank 1
P0300
Random / multiple cylinder misfire detected
P0171
System too lean — Bank 1
P0455
Evaporative emission system leak detected — large leak
P0128
Coolant thermostat below regulating temperature
P0442
Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN
Decode a VIN to confirm the transmission and build data for a specific Wrangler. OEM
Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Reference guides

Cross-vehicle references for the kinds of data on this page.

Frequently asked

How much oil does the 2003 Wrangler 2.4L take?

4 qt w/ filter of 10W-30 API, per the factory manual.

Does the 2003 Wrangler have open recalls?

NHTSA lists 4 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the 2.4L get?

EPA figures are 16 city / 18 highway / 17 combined mpg.