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Engine light indicator on

Engine indicator always on

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Hi Rey, If the engine check light is on, it is reporting a defect in the engine management system. It will only get worse and may eventually cause a break down leaving you stranded. Take the vehicle for a diagnostic scan at a service and repair shop and find out what the problem is. Regards John

Posted on May 01, 2013

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1998 oldsmobile 88 anti-thef system cause no power to fuel pump?


Is the SECURITY light lit on the insturment cluster ? Does the engine spin with key in start position ?

Vehicle Theft Deterrent (VTD) System Check

Attempt to start the vehicle.
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Refer to Engine Cranks but Does Not Run in Engine Controls.
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Note the security indicator while attempting to start the vehicle.
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Engine Cranks But Does Not Run !

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Check engine light stays on after ignition turned off


MALFUNCTION INDICATOR LAMP (MIL) ALWAYS ON: CHECK MIL CIRCUIT FOR SHORTS TO GROUND IN wiring HARNESS .
    Note: If vehicle will not start, GO to A1 .
  • If any Key On Engine Off or Continuous Memory Diagnostic Trouble Codes are present, repair before proceeding.
  • Disconnect PCM.
  • Measure resistance between PCM harness connector Pin 2 and PCM harness connector Pin 51 or 103.
Is resistance less than 5.0 ohms? Yes No REPAIR short circuit. REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) ).
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WHAT DOES THE LIGHT ''CHECK'' MEANS


The CHECK engine light means Malfunction Indication Lamp (MIL). It is a yellow colored indicator which always keep the driver of the car informed about the performance of the engine sensors and the Electronic Control Module (ECM). It is always in the OFF state when the engine is running. If it becomes on while the engine is running it become necessary to get the car be checked and scanned for any one or more problems which have occurred in the Electronic Fuel Injection (EFI) system.

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1 Answer

I have a 2001 mustang bullitt that is showing service engine light on. Took it to mechanic and he put 2 different machines on it to show code for problem. No codes coming up and he can't turn off the...


There is a diagnostic procedure in the factory service repair manual for engine light lit ,no codes . Did you take it to ford dealer ? MIL - is referring to check engine , service engine soon etc...
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SERVICE ENGINE SOON indicator After the engine is started, the SERVICE ENGINE SOON indicator will prove out for a duration of three seconds. If the instrument cluster does not receive a message from the PCM within five seconds, the instrument cluster will illuminate the SERVICE ENGINE SOON indicator and log a diagnostic trouble code (DTC).

  • An indicator is inoperative/always on - SERVICE ENGINE SOON
  • Circuitry.
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No INSTALL a new instrument cluster; REFER to Instrument Cluster . CLEAR the DTCs. REPEAT the self-test.

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1 Answer

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you mean check engine little it o2 sensor have any codes

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Service engine soon light is always on


Always on,why is that?

Those thype of lights have been on all vehicles
for over 30 years as required by the govt in north
america at least,so how is it your not checking for codes
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That is a MIL Lamp or Check Lamp indicating your car
has a possible faiure in one of it's many systems

You check for codes right away & diagnose,resolve or
repair within a week inless it isn't something that would
ruin your engine or trans etc.

The wording service soon is misleeding & nothing to
do with you getting some type of service at your convenience,
it is a serious problem untill you check for codes & at least
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1 Answer

My 2004 Ford Taurus engine is always on and there doesnt seem to be a problem. is this a common malfuntcion of this model? (with the engine light always being on?)


generally indicates the computer is sensing something out of sorts with the system of the car. Take to a dealer, mechanic, or autozone to have computer scanned to diagnose the cause of the light coming on.

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1 Answer

2000 Nissan Xterra Service Engine soon indicator is always on


The knock sensor is not a huge deal to replace and will not turn on the light. It should be dont though.

The crankshaft sensor is located directly between the engine and transmission. It is dead center at the bottom.

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