Po442 Evaporative Emmison system leak. Heat catalyst egr set malfunctions. Primary and secondary a/c system deficiencies.
The worst 2004 Ford Mustang problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Acceleration33
- Airbags9
- Brakes9
- Engine9
- Transmission9
- Suspension7
- Fuel system6
- Tires6
- Body4
- Electrical3
- Steering3
- Lights2
- Seat belts2
- Seats2
- Visibility2
- Driver assistance1
Specific symptoms reported on the 2004 Ford Mustang
Recalls 1
Vehicle speed control: accelerator pedal
- What is wrong
- On certain mustang cobra passenger vehicles, the rear surface of the accelerator pedal may come into contact with floor carpeting during heavy throttle application. The unique surface profile of the accelerator pedal may catch in the cutout on the floor carpeting behind the accelerator pedal.
- Risk
- This could interfere with the pedal's ability to return to an idle position. Unexpected, continued throttle application and/or increased stopping distances may occur which could result in a crash.
- Remedy
- Dealers will install a shield over the cutout in the carpet behind the accelerator pedal. The recall began on april 26, 2006. Owners may contact ford at 1‑800‑392‑3673.
Recall number 06V108000 · Recall details
See all 1 recalls for the 2004 Ford Mustang
Defect investigations
Spark plug ejection from cylinder head
On september 6, 2005, odi received a petition requesting that the agency investigate allegations of engine spark plug ejection in certain model year 1997 through 2004 ford vehicles with triton v-8 and v-10 engines.odi received a total of 474 non-duplicative complaints on the subject vehicles where the complainant, or the dealer repairing the vehicle, reported that a spark plug detached from the cylinder and/or ejected from the engine.as of december 8, 2005, odi is not aware of any allegations where the alleged defect resulted in a loss of vehicle control, a crash, an injury, or a fatality in any of the 10,319,810 subject vehicles.in addition, odi is aware of only two incidents where the vehicle stalled without restart.information contained in the odi consumer complaints and obtained from 72 telephone interviews with complainants showed the following:(1) 99% of the complaints were on my 1997 to 2002 subject vehicles.(2) most the complainants reported hearing a loud pop while driving or upon starting up the vehicle followed by a loud, repetitive clicking or popping sound.(3) many of the complainants reported that the popping sound was accompanied by some loss of vehicle power; however, in 99% of the incidents reported, the vehicle did not stall.in the very few incidents where the vehicle did stall, most vehicles could be restarted.(4) only a small percentage of the complainants cited that they smelled gas or a slight burning smell when the incident occurred.(5) in all but a very few incidents, vehicle damage was limited to the engine.in one incident, the complaint reported that the fuel rail was damaged and replaced after one of the spark plugs ejected from the engine; however, the complainant reported that the damage did not result in any type of fuel leak or fire.in another incident, the only incident where a fire was alleged, the complainant reported that no fluid leak was observed, but that a fire resulted after the spark plug had ejected from the engine and he had restarted the vehicle and driven to another location.none of the complainants reported any damage to the vehicle hood.(6) only two complainants reported that they observed what appeared to be some drops of fuel coming from the cylinder where the spark plug had failed or on the spark plug itself; however, each of these complainants reported that there was no smoke or flames as a result of his incident.as the petitioner noted, and odi?s analysis showed, it is possible for a spark plug to detach from the engine cylinder threads in the subject vehicles.however, odi?s analysis of 474 complaints describing such incidents found only a very few alleged any safety-related consequences.none of these showed any evidence of a serious safety consequence.given the large population and relatively long exposure time of the subject vehicles, the complaint analysis indicates that the risk to motor vehicle safety from the alleged defect is very low.in view of the foregoing, it is unlikely that the federal safety agency would issue an order for the notification and remedy of the alleged defect at the conclusion of the investigation requested in the petition.therefore, in view of the need to allocate and prioritize the federal safety agency?s limited resources to best accomplish the agency?s safety mission, the petition is denied.
DP05005
Accelerator pedal interference
On april 3, 2006, ford motor company submitted a defect information report to the federal safety agency concerning a defect condition that could result in interference between the accelerator pedal and floor carpeting in approximately 19,140 model year 2003 and 2004 mustang cobra vehicles (ford recall no. 06s43/the federal safety agency recall 06v‑108, copy attached).ford will recall the vehicles to install a shield beneath the accelerator pedal to prevent the pivot pin on the rear surface of the pedal from coming into contact with the floor carpeting during heavy throttle application.in those vehicles where the floor carpeting does not fit flush with the sheet metal, the unique rear surface profile of the mustang cobra pedal may allow the pivot pin of the pedal to catch in the cutout on the floor carpeting behind the pedal, interfering with the pedal's ability to return; the result of which could be unexpected, continued throttle application.during the engineering analysis stage of the investigation, odi also examined the possiblity of the same phenomena occuring in non-cobra mustangs.however, the different design of the accelerator pedals on the non-cobra mustangs results in significant differences in the potential contact between the accelerator pedal and the carpeting, with the base of the pedal pad acting to force the carpet away from the pivot pin.this engineering analysis has been closed.
EA05014
Accelerator pedal interference
Pe05-038 was opened on july 7, 2005, with 11 consumer complaints to odi alleging incidents of throttle sticking due to accelerator pedal interference with the carpet.odi has received an additional 24 complaints since the pe was opened.during pe05-038, ford supplied complaint and warranty information regarding 86 additional incidents of accelerator pedal interference in model year 2003 to 2004 mustang cobra vehicles.eighty-five of these had concerns of accelerator pedal sticking, 70 of which were analyzed as being related to carpet interference.odi is continuing its analysis of the causal factors in the remaining 15 incidents.this preliminary evaluation has been upgraded to an engineering analysis.
PE05038
Technical service bulletins for the 2004 Ford Mustang 33
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- The Powertrain Control/Emissions Diagnosis (PC/ED) manual has been revised for diagnosing electronic...
- Some 1997-2008 vehicles equipped with a 4.6L 2V, 5.4L 2V, or 6.8L 2V engine--spark plug thread repair...
- Limited slip axle chatter, shudder, binding sensation, or vibration during low speed turning maneuvers
- Engine misfire with diagnostic trouble code (DTC) pewee, P0302, P0303, P0304, P0305, P0306, P0307, P0308,...
- Wds cop kit diagnostic tip - coil on plug (COP) ignition systems - engine misfire or rough running
- Safety belt retraction speed
- Safety belt web stop button service
- 1-2 shift clash, grind or hard to shift - TR3650 5 speed manual transmission
- Rear window defroster grid/integral antenna diagnosis and repair - terminal tab repair
- Steering rack noise
2004 Ford Mustang fuel economy
Official EPA estimates in miles per gallon (MPGe for electric). Ranges cover trims that share the same engine.
| Engine | Drive | City | Highway | Combined |
|---|---|---|---|---|
| 3.8L 6‑cyl | RWD | 17-18 | 25-27 | 20-21 |
| 3.9L 6‑cyl | RWD | 17-18 | 24-27 | 20-21 |
| 4.6L 8‑cyl | RWD | 15-16 | 21-23 | 17-18 |
What 2004 Ford Mustang owners say
Most recent owner complaints, unedited.
See attached document for complaint
Casual driver. Noticed acceleration and coasting/rolling were sluggish. Mechanic noted brake area temp on front driver's side was over 400 degrees. The brakes on that wheel would not release completely and caused continuous friction producing overheating. (I noticed I am not the only one to submit this brake problem to this board. ) the mechanic replaced the total front brakes and master cylinder system. Cost over $1100 to do this back in 2013. It is now jan 2021 and I still have less than 50,000 miles on my baby mustang.
Never know when car is fully gas up always put gas in at 1/4 to 1/2 tank, will overfill if not very carefully so really just put no more than 10 to 15 dallas never shows full. Do not want to overflow on me for one two it's bad for my baby #1 mustang
Back on march 1, 2016 I believe I was coming to a stop light I applied my foot on the break and the car seem to wanna keep inching forward inching forward I had at this time continued to press down on the break as soon as I knew it I was in the middle of the street practically during a red light and was sideswiped. After looking under to see what was causing that it seems to be my gas pedal was hung up on a piece of carpeting on the floor of the car causing my gas pedal to become stuck to that carpet I had to cut the piece of carpeting away from that to stop that from doing that later to find out there had been a recall when I took my car for the recall they told me that it was only on specific mustangs I don't know why if my car was having the same issue the police officer said he was not giving me a ticket because he didn't feel that I was at fault but yet my insurance went up and paid the other driver for damages. Because it's been three years I will do my best to get the paperwork together
Gas pedal got caught on a piece of carpet which caused my car to enter into an intersection on a red light and caused me to have an accident. Which then made my insurance jump. I remember this day very well it was the day before my birthday I came up to the red light and stopped the car seem to want to keep moving forward as I put my foot on the break it was still a red light my car was moving forward cars were beeping at me as I kept inching into the middle of the street my car was hit in the rear passenger side by another mustang. I explain to the police officer that what seem to happen was my carpet seem to have gotten caught on the gas pedal. After later learning that there was a recall for that particular problem it wasn't re calling under my VIN. To this day I have an accident mark on my insurance which made my bill go up I don't think that this is fair considering that it was not my fault I tried showing the insurance company that there was a recall but it wasn't recalling under my VIN number
Abs brake light is on this is unsafe in wet or snowy conditions
Tl* the contact owns a 2004 ford mustang. While driving 25 MPH, the accelerator pedal became caught in the floormat and caused the vehicle to accelerate. The contact had to shift into neutral to stop the vehicle. The dealer and manufacturer were not contacted. The failure mileage was 169,865.
Back in 2016 I was involved in an accident in which my gas pedal seemed to have got hung up on the carpet which caused my gas pedal to accelerate a little when I was at a red light causing me to have an accident.. I was coming to a stop at a red light when the pedal seemed to have got stuck. I had my foot on the brake but the car seemed to want to continue to move I just thought my accelerator was set a little high until saw that the pedal was getting caught on the carpet.
Tl* the contact owns a 2004 ford mustang. While attempting to drive off from a parking space, the vehicle accelerated from 0 to approximately 40 MPH. As a result, the vehicle crashed into the front driver's side of another vehicle the air bags did not deploy. A police report was filed. There were no injuries. The vehicle was damaged, but was not towed. The cause of the failure was not diagnosed. The dealer and manufacturer were not made aware of the failure. The failure mileage was approximately 171,000.
Compare the 2004 Ford Mustang
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Other model years
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Questions about the 2004 Ford Mustang
Is the 2004 Ford Mustang reliable?
Owners have filed 116 complaints about the 2004 Ford Mustang, fewer than a typical Mustang model year.
What is the 2004 Ford Mustang year score?
The 2004 Ford Mustang scores 83 out of 100 (good). The score compares it with the other model years of the Ford Mustang: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.
What is the most common problem with the 2004 Ford Mustang?
Acceleration and speed control, with 33 complaints, typically around 9,464 miles. Next is airbags (9).
How many recalls does the 2004 Ford Mustang have?
1 recall, covering vehicle speed control.
Was there a recall on the 2004 Ford Mustang acceleration?
Yes, 1 recall: 06V108000. Check your VIN to see if your car still needs the free repair.
What year does the Ford Mustang have the most acceleration problems?
The Ford Mustang model years with the most acceleration complaints are 2005 (54 complaints), 2007 (43 complaints) and 2011 (39 complaints).
What gas mileage does the 2004 Ford Mustang get?
Official estimates for the 2004 Ford Mustang range from 17 to 21 mpg combined. The most efficient version (3.8L 6-cyl, RWD) gets 17-18 city and 25-27 highway.
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