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Cheak engine soon light keeps flashing - 2003 Mercury Mountaineer

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Is the car missing or not running quite right, have a little more wiggle to it? Flashing check engine light is usually indications of a cylinder misfiring which could be caused by a few different things.

Posted on Aug 05, 2010


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My trailblazer was ibeling then it died when I started it up it was missing and service engine soon light flashes on an off none stop

Your vehicle has a bad misfire that could damage the catalytic converter. That's why the service engine soon light flashes . If you drive it like that it will damage the cat. Have towed to the repair shop . Flashing Check Engine Light CarMD

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Will this problem stop your car from running or stopping

The service engine soon light flashing means if you continue to operate the vehicle in its current condition imminent damage to the catalytic converter or the engine itself

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No codes just service engine soon light

Many codes can't be read with a generic scanner.. the cheak engine light can be on for a computer problem that the computer can't display codes for some reason. Power can be shorted to the check engine light wire and put it on for a non computer issue. ( someones wired in a radio and got into the wrong wires)

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A flashing check or service engine light indicates a misfire thatr is happenning at that time. Severe misfires can quickly harm your catayitic converter, and need to be corrected quickly, hence the flashing light. Could be ignition, fuel injection, mechanical, or any number of other things, but check it as soon as possible.

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'low coolant light' flashes all the time and then 'service engine soon'

These problems may or may not be related. The Check coolant light means that the coolant level in your radiator is low. If you have checked it and it is not low, then the sensor is most likely defective. The low coolant sensor will not turn the Check Engine light on - even if the coolant really is low. There are many things that can cause the Check Engine light to come on. You will have to scan your Engine Computer to find out why it has been turning the light on.

I did have a problem on one of these cars one time where the Check Engine light was coming on and there were several codes for the Throttle Position Sensor(TPS) and the Manifold Absolute Pressure (MAP) sensor and the car ran really bad. The Check Coolant light was also on. After checking it out I found that the coolant level sensor was shorting out the 5 volt reference circuit (VREF) from the computer and causing the whole problem. Replacing the coolant level sensor fixed the car.

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that means engine is not running on all cylinders, this should be fixed asap

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You need Error codes clearing on engine Otherwise it will play up to keep letting you know there is error codes that need attention

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