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Location of coolant head temp sensor

Discussion in '1994-2004 V6 Mustang Tech' started by jshane420, Jul 13, 2017.

  1. jshane420

    jshane420 New Member

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    I have a 2003 Ford Mustang with a V6 and the check engine light comes on when it runs like crap I put a scan tool on it and it says that the coolant head temperature sensor is bad p1285 is the code well I am trying to find the location of the sensor can anyone help me and tell me where it is located on the motor not the coolant temperature sensor either
     
  2. 6 Shooter

    6 Shooter Well-Known Member

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    Driver's side on rear of cylinder head, between the firewall. May be easier to locate from the underside looking up.
     
  3. jshane420

    jshane420 New Member

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    Ok thank you I'll raise it up and see if I can find it thank you
     
  4. jshane420

    jshane420 New Member

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    Ok I looked and I don't see any type of sensor back there
     
  5. jshane420

    jshane420 New Member

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    I looked and there's nothing
     
  6. 6 Shooter

    6 Shooter Well-Known Member

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    Look on the passenger side.
     
  7. jshane420

    jshane420 New Member

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    I've looked on both sides
     
  8. 6 Shooter

    6 Shooter Well-Known Member

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    Mine is screwed into the driver's side cylinder head in the lowest hole outer side. hard to see, but does have a 2-wire harness and connector attached.
     
  9. jshane420

    jshane420 New Member

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    Okay I found where the sensor goes there was not one there I bought a new one put it in this morning and plugged it in and the car is still doing the same thing that it was before any other ideas on what it could be
     
  10. 6 Shooter

    6 Shooter Well-Known Member

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    If there was no sensor in the cylinder head before, then the harness was just hanging down somewhere along the engine or transmission housing. Am thinking that that harness may have been damaged due to heat or being snagged and the insulation torn. Try using a bright light and look to see if the wiring harness got damaged somehow.

    Next, has your radiator been losing coolant? Have you changed the coolant temp sensor on the lower intake (maybe towards the front) as they can fail after years of service? Has your motor overheated recently?
     
  11. Suek

    Suek Member

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    I didn't know there is one toward the front. The only one I seen toward the front is on a GT. I found mine on my 2002 on the drivers side at the end of the valve cover down in back between the firewall. You don't have to go too far down.
     
  12. 6 Shooter

    6 Shooter Well-Known Member

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    That is the cylinder head temp sensor which the PCM is using as a substitute for coolant temp sensor in later models. Mine has both as the car is a 2000 (coolant temp) but the PCM is a 2004 which became necessary to add a CHT sensor so as to not piss off the PCM.
     
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  13. Suek

    Suek Member

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    Gotcha. Thanks very much.
     
  14. jshane420

    jshane420 New Member

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    P1289 that is the one of the codes that come up so the guy that I bought it off of said that he put a different motor in it but all the plugins plug in the same the only thing that was missing was that temperature that coolant head temperature sensor I can drive it down the road and will be fine all of a sudden it acts like it shuts off the four cylinders and then comes back to life and does it over and over and over again and the temperature gauge does not really work either it stays on cold all the time