The best way to solve the problem is in service and repair manual which will guide you to locate and fix the problem on your own easily and you will get the manual from the given link https://toolsnyou.com
Why i don't know , get the OBD read this will tell the code's for faulty sensor/s/components etc, might just need OBD clearing
SOURCE: failsafe engine mode
The failsafe mode can appear following numerous faults being detected - some faults can be momentary and register but not cause a problem. These are normally reset by just turning ignition off/on. get the fault code memory read at a garage and this may give you a clue as to a possible problem developing. Failsafe mode will give you reduced engine performance but will allow you to drive for normally some distance. If a serious problem developes your car message centre will tell you to shut off the engine or it will shut it down.
good luck.
SOURCE: Service Engine soon light on 2001 Mercury
Your vehicle either requires maintenance or has suffered a failure...either way you need to take it to a shop.
SOURCE: 1999 Mercury Mountaineer, heater/AC fan no longer blowing
I would check the fan first disconnect the electrical connectors on it and use a pair of home made jumper cables and run it from the battery. If it works move unto relay if it doesn't you've found the culprit.
Next check relay in the fuse box. Coolant tempertant switch(CTS) aka thermal switch and its circuit. CTS is usually located in the water jacket by the t-stat.
SOURCE: Removed battery posts on vehicle to clean and to
The fail safe mode is caused by low battery or disconnecting the battery. Now the check engine light is on because it got a code from the fail safe mode. You can try to reset it by removing the battery cable for 10 minutes again. This may cause the fail safe mode again and start the whole process over again. The fail safe mode should not come up again though. Make sure that the key is off when you remove and replace the battery cable.
SOURCE: 1997 Mercury mountaineer. 143,000 miles.
Hello Sdhesseltine.
The flashing check engine light is telling you the engine is misfiring and your description of the problem confirms that.
There will be a code stored in the vehicles engine computer that will tell you which cylinder(s) is/are misfiring.
Spark plugs, ignition coil, fuel injectors or internal engine problems will cause this.
If it has been a while since your last tune up it would certainly be a very good place to begin.
The usual tune up stuff, spark plugs, air and fuel filters for the basics.
A fuel filter will not be at fault in this case but is part of a tune up on this model.
If you require further advise, please ask me here in comments, be glad to help.
Thank you for using FixYa.
KL
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