2004 DODGE DURANGO check engine light

MMT In Gasoline
MMT is a manganese-containing metallic additive that is
blended into some gasoline to increase octane. Gasolines
blended with MMT provide no performance advantage
beyond gasolines of the same octane number without
MMT. Gasolines blended with MMT reduce spark plug
life and reduce emission system performance. We recom-
mend that gasolines free of MMT be used in your vehicle.
The MMT content of gasoline may not be indicated on
the gasoline pump; therefore, you should ask your gaso-
line retailer whether or not his/her gasoline contains
MMT.
It is even more important to look for gasolines without
MMT in Canada because MMT can be used at levels
higher than allowed in the United States. MMT is pro-
hibited in Federal and California reformulated gasolines.
Sulfur In Gasoline
If you live in the northeast United States, your vehicle
may have been designed to meet California low emission
standards with Cleaner-Burning California reformulated
gasoline with low sulfur. If such fuels are not available in
states adopting California emission standards, your ve-
hicles will operate satisfactorily on fuels meeting federal
specifications, but emission control system performance
may be adversely affected. Gasoline sold outside of
California is permitted to have higher sulfur levels which
may affect the performance of the vehicle's catalytic
converter. This may cause the Check Engine or Service
Engine Soon light to illuminate. We recommend that you
try a different brand of unleaded gasoline having lower
sulfur to determine if the problem is fuel related prior to
returning your vehicle to an authorized dealer for ser-
vice.
244 STARTING AND OPERATING

CAUTION!
If the Check Engine or Service Engine Soon light is
flashing, immediate service is required; see onboard
diagnostics system section.
Materials Added To Fuel
All gasolines sold in the United States are required to
contain effective detergent additives. Use of additional
detergents or other additives is not needed under normal
conditions and would result in unnecessary cost. There-
fore, you should not have to add anything to the fuel.
ADDING FUEL
NOTE:If fuel is poured from a portable container, the
container should have a flexible nozzle long enough to
extend into the fuel filler tube.
CAUTION!
To avoid fuel spillage and overfilling, do not ªtop
offº the fuel tank after filling.
NOTE:When the fuel nozzle ªclicksº or shuts off, the
fuel tank is full.
NOTE:Tighten the gas cap until you hear a ªclickingº
sound. This is an indication that the gas cap is properly
tightened. Make sure that the gas cap is tightened each
time the vehicle is refueled.
STARTING AND OPERATING 245
5

EMISSIONS INSPECTION AND MAINTENANCE
PROGRAMS
In some localities, it may be a legal requirement to pass
an inspection of your vehicle's emissions control system.
Failure to pass could prevent vehicle registration.
For states which have an I/M (Inspection and
Maintenance) requirement, this check verifies the
following: the MIL (Malfunction Indicator Lamp)
is functioning and is not on when the engine is running,
and that the OBD (On Board Diagnostic) system is ready
for testing.
Normally, the OBD system will be ready. The OBD
system maynotbe ready if your vehicle was recently
serviced, if you recently had a dead battery, or a battery
replacement. If the OBD system should be determined
not ready for the I/M test, your vehicle may fail the test.Your vehicle has a simple ignition key actuated test
which you can use prior to going to the test station. To
check if your vehicle's OBD system is ready, you must do
the following:
1. Insert your ignition key into the ignition switch.
2. Turn the ignition to the ON position, but do not crank
or start the engine.
3. If you crank or start the engine, you will have to start
this test over.
4. As soon as you turn your key to the ON position, you
will see your MIL symbol come on as part of a normal
bulb check.
5. Approximately 15 seconds later, one of two things will
happen:
a. The MIL light will blink for approximately 5 sec-
onds and then remain on until the first engine crank or
290 MAINTAINING YOUR VEHICLE

the key is turned off. This means that your vehicle's
OBD system isnot readyand you shouldnotproceed
to the I/M station.
b. The MIL light will remain fully illuminated until the
first engine crank or the key is turned off. This means
that your vehicle's OBD system isreadyand you can
proceed to the I/M station.
If your OBD system isnot ready,you should see your
dealer or repair facility. If your vehicle was recently
serviced or had a battery failure or replacement, you may
need to do nothing more than drive your vehicle as you
normally would in order for your OBD system to update.
A recheck with the above test routine may then indicate
that the system is now ready.
Regardless of whether your vehicle's OBD system is
ready or not ready, if the MIL symbol is illuminated
during normal vehicle operation, you should have yourvehicle serviced before going to the I/M station. The I/M
station can fail your vehicle because the MIL symbol is on
with the engine running.
REPLACEMENT PARTS
Use of genuine Mopartparts for normal/scheduled
maintenance and repairs is highly recommended to in-
sure the designed performance. Damage or failures
caused by the use of non-Mopartparts for maintenance
and repairs will not be covered by the manufacturer's
warranty.
DEALER SERVICE
Your dealer has the qualified service personnel, special
tools and equipment to perform all service operations in
an expert manner. Service manuals are available which
include detailed service information for your vehicle.
Refer to these manuals before attempting any procedure
yourself.
MAINTAINING YOUR VEHICLE 291
7

CAUTION!
Failure to perform the required maintenance items
may result in damage to the vehicle.
At Each Stop for Fuel
²Check the engine oil level about 5 minutes after a fully
warmed engine is shut off. Checking the oil level while
the vehicle is on level ground will improve the accu-
racy of the oil level reading. Add oil only when the
level is at or below the ADD or MIN mark.
²Check the windshield washer solvent and add if
required.
Once a Month
²Check tire pressure and look for unusual wear or
damage.
²Inspect the battery and clean and tighten the terminals
as required.
²Check the fluid levels of coolant reservoir, brake
master cylinder, and transmission and add as needed.
²Check all lights and all other electrical items for correct
operation.
At Each Oil Change
²Change the engine oil filter.
²Inspect the exhaust system.
²Inspect the brake hoses.
²Inspect the CV joints (if equipped) and front suspen-
sion components.
²Check the automatic transmission fluid level.
²Check the coolant level, hoses, and clamps.
342 MAINTENANCE SCHEDULES
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Adding Engine Coolant (Antifreeze).......... 309
Adding Fuel........................245,270
Air Cleaner, Engine...................... 298
Air Conditioner Maintenance............... 302
Air Conditioning........................ 184
Air Conditioning Controls................. 184
Air Conditioning Refrigerant.............302,303
Air Conditioning System................179,302
Air Filter.............................. 298
Air Pressure, Tires....................231,239
Airbag.............................38,153
Airbag Light............................ 50
Alarm..............................24,149
Alarm, Panic............................ 21
Alignment and Balance................... 238
Alterations/Modifications, Vehicle............. 6
Antenna, Satellite Radio................... 176
Antifreeze (Engine Coolant)..............308,335
Anti-Lock Brake System................... 218Anti-Lock Warning Light.................. 149
Anti-Theft System.....................24,149
Appearance Care........................ 321
Arming Theft System...................... 25
Auto Unlock............................ 16
Automatic Dimming Mirror...............70,74
Automatic Door Locks..................... 15
Automatic Headlights.................... 106
Automatic Temperature Control............. 184
Automatic Transaxle...................... 203
Automatic Transmission.............200,203,315
Adding Fluid......................316,317
Fluid and Filter Changes................. 318
Fluid Level Check...................315,316
Fluid Type........................318,338
Gear Ranges.......................... 203
Special Additives...................... 318
Torque Converter...................... 207
Axle Fluid............................. 338
370 INDEX

Exhaust Gas Caution..................62,248
Fails to Start.......................... 201
Flooded, Starting...................... 201
Fuel Requirements..................... 335
Jump Starting......................... 280
Oil ...........................292,335,337
Oil Selection.......................... 335
Oil Synthetic......................... 296
Overheating.......................... 310
Starting............................. 200
Temperature Gauge..................... 146
Engine Oil Viscosity Chart................. 295
Entry System, Illuminated.................. 13
Equipment Identification Plate.............. 267
Ethylene Glycol Antifreeze................. 308
Exhaust Gas Caution................62,248,306
Exhaust System.......................62,306
Extender, Seat Belt........................ 37
Exterior Lighting........................ 106Filters
Air Cleaner.......................... 298
Engine Fuel.......................... 299
Engine Oil........................297,337
Engine Oil Disposal.................... 296
Flashers
Hazard Warning....................... 270
Turn Signal.....................108,146,329
Flat Tire Stowage.....................273,279
Flooded Engine Starting................... 201
Floor Console.......................... 137
Fluid, Brake........................... 338
Fluid Capacities......................... 335
Fluid Level Checks
Automatic Transmission................. 316
Brake............................... 313
Cooling System....................... 306
Engine Oil........................... 292
Power Steering........................ 303
374 INDEX