Engine Light Won't Go Off

Discussion in '1994 - 1995 Specific Tech' started by sn953.9, Jun 8, 2014.


  1. sn953.9

    sn953.9 New Member

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    i have a 3.8 sn95 mustang. the check enginr light came on. i got it diagnosed, it was the camshaft piston sensor. i replaced the camshaft piston sensor, and reset the computer. it stays off untill i shut the car off. when i turn it on again the check engine light comes back on. HELP!
     
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  2. toyman

    toyman SN Certified Technician

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    It's the camshaft position sensor. Who did the diagnostics? Since this is an 3.8 l the computer is OBDII compliant. Have someone like Autozone pull the codes and report back. There could be dozens of sensor inputs causing the CEL.
     
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  3. sn953.9

    sn953.9 New Member

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    i took it to advanced auto parts they are the ones who pulled the code.
     
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  4. toyman

    toyman SN Certified Technician

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    What were the code numbers. Telling us they pulled the codes doesn't shed any light on possible causes.
     
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  5. sn953.9

    sn953.9 New Member

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    p0340 is the camshaft position sensor code.
     
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  6. toyman

    toyman SN Certified Technician

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    Have you checked the codes after having cleared any old ones? The way I read your post you still see a CEL but you haven't checked to see if it's something else.
     
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  7. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

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    Some of those parts stores will not clear codes, but only check them for you. Go clear them
     
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  8. sn953.9

    sn953.9 New Member

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    what else do you think it could be ?
     
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  9. sn953.9

    sn953.9 New Member

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    i reset the computer several times, the CEL will stay off till i turn the car off. when i start it up againe it comesback on.
     
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  10. toyman

    toyman SN Certified Technician

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    How are you clearing the codes? Codes are checked both KOEO and KOER. With literally 100's of events that can cause a CEL one can't possibly guess. That's why one needs the assistance from a scanner/reader.
     
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  11. sn953.9

    sn953.9 New Member

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    I disconnected the possitive from the battery, for a few minutes.
     
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  12. toyman

    toyman SN Certified Technician

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    Always disconnect the negative first and only the positive if removing the battery. With the negative off it will take about 15 minutes to clear the KAM (Keep Alive Memory).
     
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  13. sn953.9

    sn953.9 New Member

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    i did exactlly what you said, and the cel still came back on.
     
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  14. toyman

    toyman SN Certified Technician

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    And the only code being read as of today is p0340? If it is the only code check the crank sensor connection to ensure that there isn't a bent or damaged pin.
     
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