Question about 2005 Mercury Mountaineer

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Engine Failsafe Mode came on after cleaning battery cables. Vehicle will start, but won't run. No throttle

I took the battery cables off to clean them. Now the dash is displaying Engine failsafe mode. It does not react to the throttle at all. There is also a wrench icon lit. I can't drive it .. how do I fix it?

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  • Lori Feb 26, 2012

    My brother added a quart of oil .. waited a few minutes and started it .. IT WORKED! Never heard of such a thing .. but he said it happened to him in his F150. Problem solved!

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  • Mercury Master
  • 2,431 Answers

Fail safe is TPS sensor. When you go in fail safe the vehicle give a set amount of RPM and no throttle response the rule of thumb in fail safe is APP1 and APP2 does not agree the goal is to protect the catalytic convertor. So if the transmission was at fault you dont over rev to end up burning the Cat. Or over rev to break the engine It all boils down to a throttle body assembly as the solution

Posted on Feb 26, 2012

Testimonial: "I took the vehicle to Ford, they replaced the throttle body. Runs great now! :) "

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Posted on Jan 02, 2017

vetteman3002
  • 2299 Answers

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.

Posted on Oct 26, 2010

  • 1 Answer

SOURCE: I gave a 2005 Mercury

I have the same car and HAD the same problems. Just got it back from the Tranny shop, seems to have fixed the issues. Take it to a very good transmission shop and tell them it is a known issue, some kind of bearings in the tranny, hence the knocking...

Posted on Jan 31, 2011

  • 5467 Answers

SOURCE: 05 Mercury Montego Throttle control/sensor

Try a salvage yard for the part. As soon as your new car left the lot it became a used car. Used cars run on used parts.
If the old part is a recall they will upgrade you regardless which part is on your car.
Check the internet and enter your part# in the search box of the Browser. You may get lucky for a new part.

Posted on Aug 18, 2009

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Fail safe mode on a Jaguar is mainly caused by a dirty and gummed up throttle body. The throttle body on your auto has a protective coating, so you can not use just any cleaner. It requires a throttle body cleaner that states "safe to use with a protective coating". The butterfly valve in the throttle body will actually "stick out". This causes fail safe mode to kick in reducing the amount of power your engine can produce.

Also check the plugs on your ECM (computer) and make sure they are all seated properly.


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My 2000 Jag S type also keeps saying failsafe mode?


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2000 Jag S Type Help!


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This is from wikipedia.

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