Service engine soon light.

Asked by Mar 07, 2016 at 10:39 AM about the 2003 Ford Mustang Coupe

Question type: Maintenance & Repair

My 03 mustang has been a problem since day one,
after 1 month, the engine cooling sensor has been
replaced treat has also been replaced along with
the fan because it over heated on us. So after a
couple of months I noticed the temperature was
reading right I would drive 9 miles and temperature
stayed at cool. So my husband change  fuel filter
and also did a oil change on it. He left the car idling
and it over heated again. He took it auto zone and
they did dig test and it was the cooling engine
sensor agian, we changed that just 3days ago. So I
had my a/c on and car was idling parked and it
over heated agian and now service engine soon
light Is on... please help

6 Answers

254,695

The sensor is probably tripping the CEL due to the high temperature, You have to figure why it is overheating in the first place. Low coolant level, stuck closed thermostat, fan not coming on, etc.

100,565

It defently sounds like you have cooling system issues, the cooling fan should turn on when the A/C is turned on, if it does and you still overheat then the most common cause is a radiator restriction, and that requires a radiator replacement. If the A/C is not on then the fan normally kicks in at around 200 to 220 degrees, depending on ECM settings, if it doesn't then there maybe a wiring or relay problem. This is assuming the thermostat is operating properly. HTH

The fan has been replaced less then a year ago. I did put coolant in it. So what do you recommend me to do about engine light on.. I will be replacing fan and going to get a radiator flush...

1,730

If it overheats wen idling and a/c on, typically its either fans not cooling it fast enough or radiator plugged. Wen u drive moderate speeds the cool air will help cool it, but not at idle. There u need fans to kick on and off as temps rise. Since u replaced fans, etc and assuming antifreeze is filled and there are no other issues I would guess restricted radiator. Can try flushing it, but I don't think they"re worth the hassle, they to me only buy a little time. Look at rock auto.com for maybe good price

100,565

I wouldn't even bother with a flush at this point in time, that is usually just a maintence procedure not meant to cure already existing cooling trouble, just replace the radiator. As far as the check engine light, you need to find out what it is telling you so a code check is the next step on that end, write them down and repost them back here and someone will jump in and help you out with further diagnosis. HTH

1,730

Also did or husband mix antifreeze? They are not all compatible with each other, they can gel! Make sure no gelling has occurred and use right antifreeze!

Your Answer

Mustang

Looking for a Used Mustang in your area?

CarGurus has 37,799 nationwide Mustang listings starting at $895.

ZIP:

Ford Mustang Experts

  • #1
    Tom Demyan
    Reputation
    4,590
  • #2
    Bob Beaman
    Reputation
    1,260
  • #3
    COMETGUY61
    Reputation
    1,110
View All

Related Models For Sale

Used Chevrolet Camaro
403 Great Deals out of 30,674 listings starting at $3,550
Used Chevrolet Corvette
287 Great Deals out of 20,559 listings starting at $2,990
Used Ford Mustang SVT Cobra
8 Great Deals out of 288 listings starting at $5,995
Used Ford F-150
2,292 Great Deals out of 183,642 listings starting at $699
Used BMW 3 Series
1,150 Great Deals out of 32,993 listings starting at $1,000
Used Jeep Wrangler
301 Great Deals out of 16,205 listings starting at $2,500
Used Chevrolet Silverado 1500
2,074 Great Deals out of 165,791 listings starting at $1,900
Used Nissan 350Z
68 Great Deals out of 1,269 listings starting at $3,250
Used BMW M3
46 Great Deals out of 1,809 listings starting at $5,500
Used Honda Civic
771 Great Deals out of 72,566 listings starting at $1,400

Used Cars For Sale

2018 Ford Mustang For Sale
223 listings starting at $26,005
2017 Ford Mustang For Sale
54 Great Deals out of 17,125 listings starting at $17,490
2016 Ford Mustang For Sale
131 Great Deals out of 3,413 listings starting at $14,977
2015 Ford Mustang For Sale
96 Great Deals out of 3,020 listings starting at $12,995
2014 Ford Mustang For Sale
83 Great Deals out of 2,914 listings starting at $10,595

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.