2023 FORD MUSTANG check engine

UNDER HOOD OVERVIEW - 2.3L ECOBOOST™
Battery (out of view). See Changing the 12V Battery (page 271).A
Engine oil dipstick. See Engine Oil Dipstick (page 262).B
Engine oil filler cap. See Engine Oil Check (page 262).C
Brake fluid reservoir. See Brake Fluid Check (page 270).D
Air filter assembly. See Changing the Engine Air Filter (page 264).E
Engine coolant reservoir. See Engine Coolant Check (page 265).F
Windshield washer fluid reservoir. See Washer Fluid Check (page 275).G
Power distribution box. See Fuses (page 246).H
Note:Your vehicle may not have an enginecover as shown.
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2023 Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-11-2022, enUSA, Edition date: 202209, First-PrintingMaintenanceE174450

UNDER HOOD OVERVIEW - 5.0L
Battery (out of view). See Changing the 12V Battery (page 271).A.
Engine oil filler cap. See Engine Oil Check (page 262).B.
Engine oil dipstick. See Engine Oil Dipstick (page 262).C.
Brake fluid reservoir. See Brake Fluid Check (page 270).D.
Air filter. See Changing the Engine Air Filter (page 264).E.
Engine coolant reservoir. See Engine Coolant Check (page 265).F.
Washer system fluid reservoir. See Washer Fluid Check (page 275).G.
Engine compartment fuse box. See Fuses (page 246).H.
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2023 Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-11-2022, enUSA, Edition date: 202209, First-PrintingMaintenanceE250052

UNDER HOOD OVERVIEW - 5.0L, MACH 1
Battery (out of view). See Changing the 12V Battery (page 271).A
Engine oil filler cap. See Engine Oil Check (page 262).B
Engine oil dipstick. See Engine Oil Dipstick (page 262).C
Brake fluid reservoir. See Brake Fluid Check (page 270).D
Air filter assembly. See Changing the Engine Air Filter (page 264).E
Engine coolant reservoir. See Engine Coolant Check (page 265).F
Windshield washer reservoir. See Washer Fluid Check (page 275).G
Power distribution box. See Changing a Fuse (page 255).H
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2023 Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-11-2022, enUSA, Edition date: 202209, First-PrintingMaintenanceE296063

ENGINE OIL DIPSTICK
Minimum.A
Nominal.B
Maximum.C
ENGINE OIL CHECK
1.Make sure that your vehicle is on levelground.
2.Check the oil level before starting theengine, or switch the engine off afterwarm up and wait 15 minutes for theoil to drain into the oil pan.
Note:Checking the oil level too soon couldresult in an inaccurate reading.
3.Remove the dipstick and wipe it witha clean, lint-free cloth.
4.Reinstall the dipstick and make sure itis fully seated.
5.Remove the dipstick again to check theoil level.
Note: If the oil level is between themaximum and minimum marks, the oil levelis acceptable. Do not add oil.
6.If the oil level is at the minimum mark,immediately add oil.
7.Reinstall the dipstick. Make sure it isfully seated.
Note:The oil consumption of new enginesreaches its normal level after approximately3,000 mi (5,000 km).
Note:Increases in oil level can occur fromfrequent short trips that do not allow theengine to get to operating temperature, aswell as frequent idling or low speed drivingfor long periods of time.
Note:If oil levels are continuously notedabove the maximum mark, schedule a visitto your authorized dealer.
Adding Engine Oil
WARNING: Do not add engine oilwhen the engine is hot. Failure to followthis instruction could result in personalinjury.
WARNING: Do not remove the fillercap when the engine is running.
Do not use supplemental engine oiladditives because they are unnecessaryand could lead to engine damage that thevehicle warranty may not cover.
1.Clean the area surrounding the engineoil filler cap before you remove it.
2.Remove the engine oil filler cap.
3.Add engine oil that meets ourspecifications. See Capacities andSpecifications (page 337).
4.Reinstall the engine oil filler cap. Turnit clockwise until you feel a strongresistance.
Note: Do not add oil further than themaximum mark. Oil levels above themaximum mark may cause engine damage.
Note:Immediately soak up any oil spillagewith an absorbent cloth.
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2023 Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-11-2022, enUSA, Edition date: 202209, First-PrintingMaintenanceE270482

Engine Oil Pressure Warning Lamp
WARNING: If it illuminates whenyou are driving do not continue yourjourney, even if the oil level is correct.Have your vehicle checked.
It illuminates when you switchthe ignition on.
If it illuminates when the engineis running this indicates a malfunction.Stop your vehicle as soon as it is safe todo so and switch the engine off. Check theengine oil level. If the oil level is sufficient,this indicates a system malfunction. Haveyour vehicle checked as soon as possible.
OIL CHANGE INDICATOR
RESET
Use the information display controls onthe steering wheel to reset the oil changeindicator.
From the main menu scroll to:
Action and descriptionMessage
Press the right arrow button,then from this menu scrollto the following message.
Settings
Press OKAdvancedSettings
Press the right arrow button,then from this menu scrollto the following message.
Vehicle
Press the right arrow button,then from this menu scrollto the following message.
Oil Life
Action and descriptionMessage
Press and hold the OKbutton until the instrumentcluster displays thefollowing message.
Hold OK toReset
Reset Successful
When the oil change indic-ator resets the instrumentcluster displays 100%.
Remaining Life
{00}%
If the instrument clusterdisplays one of the followingmessages, repeat theprocess.
Not Reset
Reset Cancelled
CHANGING THE ENGINE AIR
FILTER - 2.3L ECOBOOST™/
5.0L
WARNING: To reduce the risk ofvehicle damage and personal burninjuries, do not start your engine with theair cleaner removed and do not removeit while the engine is running.
Note: Failure to use the correct air filterelement may result in severe enginedamage. Your warranty may not coverthese damages.
Only use the specified replacement airfilter. See Motorcraft Parts (page 342).
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2023 Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-11-2022, enUSA, Edition date: 202209, First-PrintingMaintenanceE67022

1.Remove the two sensor wire harnessretainers from the air box studs locatedon the front side of the air box.
2.Remove the four studs that fasten theupper air box housing to the lower airbox housing.
3.Separate the upper air box housingfrom the lower air box housing.
4.Loosen the air filter clamp enough toallow the filter to slip off the housingeasily.
5.Remove the air filter from the air filterhousing.
6.Wipe the newly-exposed air filter outlettube clamping area clean to removeany dirt or debris.
7.Install a new air filter, taking care notto damage the air filter element. Alignthe tab on the closed end of the filterwith the notch in the air filter housing.
8.Tighten the air filter clamp down.
Note:Do not overtighten the clamp or studswhen reinstalling.
9.Reinstall the upper air box piece to thelower air box piece. Tighten the 4 studsdown.
10.Reinstall the two sensor wire harnessretainers to the mating air box studs.
ENGINE COOLANT CHECK
WARNING: Do not remove thecoolant reservoir cap when the engine ison or the cooling system is hot. Wait 10minutes for the cooling system to cooldown. Cover the coolant reservoir capwith a thick cloth to prevent thepossibility of scalding and slowly removethe cap. Failure to follow this instructioncould result in personal injury.
WARNING: Do not put coolant inthe windshield washer reservoir. Ifsprayed on the windshield, coolant couldmake it difficult to see through thewindshield.
WARNING: To reduce the risk ofpersonal injury, make sure the engine iscool before unscrewing the coolantpressure relief cap. The cooling systemis under pressure. Steam and hot liquidcan come out forcefully when you loosenthe cap slightly.
When the engine is cold, check theconcentration and level of the coolant atthe intervals listed in the scheduledmaintenance information. See ScheduledMaintenance (page 449).
Note:Make sure that the coolant level isbetween the MIN and the MAX marks onthe coolant reservoir.
Note: Coolant expands when it is hot. Thelevel may extend beyond the MAX mark.
Maintain coolant concentration within48% to 50%, which equates to a freezepoint between -29°F (-34°C) and -35°F(-37°C). Coolant concentration should bechecked using a refractometer. We do notrecommend the use of hydrometers orcoolant test strips for measuring coolantconcentration.
Adding Coolant
WARNING: Do not add coolantfurther than the MAX mark.
WARNING: Do not add coolantwhen the vehicle is on or the coolingsystem is hot. Failure to follow thisinstruction could result in personal injury.
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2023 Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-11-2022, enUSA, Edition date: 202209, First-PrintingMaintenance

WARNING: Do not remove thecoolant reservoir cap when the engine ison or the cooling system is hot. Wait 10minutes for the cooling system to cooldown. Cover the coolant reservoir capwith a thick cloth to prevent thepossibility of scalding and slowly removethe cap. Failure to follow this instructioncould result in personal injury.
WARNING: Do not put coolant inthe windshield washer reservoir. Ifsprayed on the windshield, coolant couldmake it difficult to see through thewindshield.
Note: Do not use stop leak pellets, coolingsystem sealants, or non-specified additivesas they can cause damage to the enginecooling or heating systems. Resultingcomponent damage may not be covered bythe vehicle Warranty.
Note:Automotive fluids are notinterchangeable.
It is very important to use predilutedcoolant approved to the correctspecification in order to avoid plugging thesmall passageways in the engine coolingsystem. See Capacities andSpecifications (page 337). Do not mixdifferent colors or types of coolant in yourvehicle. Mixing of engine coolants or usingan incorrect coolant may harm the engineor cooling system components and maynot be covered by the vehicle Warranty.
Note:If prediluted coolant is not available,use the approved concentrated coolantdiluting it to 50/50 with distilled water. SeeCapacities and Specifications (page 337).Using water that has not been deionisedmay contribute to deposit formation,corrosion and plugging of the small coolingsystem passageways.
Note: Coolants marketed for all makes andmodels may not be approved to ourspecifications and may cause damage tothe cooling system. Resulting componentdamage may not be covered by the vehicleWarranty.
If the coolant level is at or below theminimum mark, add prediluted coolantimmediately.
To top up the coolant level do thefollowing:
1.Unscrew the cap slowly. Any pressureescapes as you unscrew the cap.
2.Add prediluted coolant approved tothe correct specification. SeeCapacities and Specifications (page337).
3.Add enough prediluted coolant toreach the correct level.
4.Replace the coolant reservoir cap. Turnthe cap clockwise until it contacts thehard stop.
5.Check the coolant level in the coolantreservoir the next few times you driveyour vehicle. If necessary, add enoughprediluted engine coolant to bring thecoolant level to the correct level.
If you have to add more than 1.1 qt (1 L) ofengine coolant per month, have yourvehicle checked as soon as possible.Operating an engine with a low level ofcoolant can result in engine overheatingand possible engine damage.
In case of emergency, you can add a largeamount of water without engine coolantin order to reach a vehicle service location.In this instance, qualified personnel:
1.Must drain the cooling system.
2.Chemically clean the coolant system.
3.Refill with engine coolant as soon aspossible.
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2023 Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-11-2022, enUSA, Edition date: 202209, First-PrintingMaintenance

When this occurs, your vehicle stilloperates, however:
•Engine power is limited.
•The air conditioning system turns off.
Continued operation increases the enginetemperature, causing the engine tocompletely shut down. Your steering andbraking effort increases in this situation.
When the engine temperature cools, youcan re-start the engine. Have your vehiclechecked as soon as possible to minimizeengine damage.
When Fail-Safe Mode Is Activated
WARNING: Fail-safe mode is foruse during emergencies only. Operateyour vehicle in fail-safe mode only aslong as necessary to bring your vehicleto rest in a safe location and seekimmediate repairs. When in fail-safemode, your vehicle will have limitedpower, will not be able to maintainhigh-speed operation, and maycompletely shut down without warning,potentially losing engine power, powersteering assist, and power brake assist,which may increase the possibility of acrash resulting in serious injury.
WARNING: Do not remove thecoolant reservoir cap when the engine ison or the cooling system is hot. Wait 10minutes for the cooling system to cooldown. Cover the coolant reservoir capwith a thick cloth to prevent thepossibility of scalding and slowly removethe cap. Failure to follow this instructioncould result in personal injury.
Your vehicle has limited engine powerwhen in the fail-safe mode, drive yourvehicle with caution. Your vehicle does notmaintain high-speed operation and theengine may operate poorly.
Remember that the engine is capable ofautomatically shutting down to preventengine damage. In this situation:
1.Pull off the road as soon as safelypossible and switch the engine off.
2.If you are a member of a roadsideassistance program, we recommendthat you contact your roadsideassistance service provider.
3.If this is not possible, wait for a shortperiod of time for the engine to cool.
4.Check the coolant level. If the coolantlevel is at or below the minimum mark,add prediluted coolant immediately.
5.When the engine temperature cools,you can re-start the engine. Have yourvehicle checked as soon as possible tominimize engine damage.
Note:Driving your vehicle without repairincreases the chance of engine damage.
Engine Coolant TemperatureManagement (If Equipped)
WARNING: To reduce the risk ofcrash and injury, be prepared that thevehicle speed may reduce and thevehicle may not be able to acceleratewith full power until the coolanttemperature reduces.
If you tow a trailer with your vehicle, theengine may temporarily reach a highertemperature during severe operatingconditions, for example ascending a longor steep grade in high ambienttemperatures.
At this time, you may notice the coolanttemperature gauge moves toward the redzone and a message may appear in theinformation display.
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2023 Mustang (CZG) Canada/United States of America, Vehicles Built From: 14-11-2022, enUSA, Edition date: 202209, First-PrintingMaintenance