Navi23

Bought a used 2006 Navigator. Owned 2 new Explorers before and love it. Familar enough and so much nicer. Anyway, it runs great and have had no problems until came home with the family and started to pull in to the garage. One of the kids toys was in the way and so I stopped and he got out to move it. Suddenly the engine died and it said Engine Fail Safe mode or something like that. Put in park and started it back up. No issues except the check engine light was on.

Took it out the next day and engine light still on, but runs fine. No issues I could tell. The same with the next day. Highway and city travel with no issues, but that light is still on.

Looking to locate an autozone or somewhere to take it, the next day, check engine is off and has not come back on.

What is the deal? What is this engine fail safe and why would the light reset?

Thanks.

Bert

Take it to Autozone to see what codes they pull.

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Bert

Navi23

Alright, here are the codes that was registered.

P2135 & P2106

Please keep in mind the check engine light went OFF 2 days later. Why would the engine fail, start back up, drive fine with check engine light, then the check engine light goes off and everything looks normal?

P2135 - ECM detected TP1 & TP2 do not agree (what is this?)

Possible causes - Failed throttle position sensor or open or short circuit condition (Have no clue what this is)

Navi23

Does this have to do with putting 87 octane gas in the Navigator?

I have run both and seen do difference in performance. I use the 87 for normal travel and the higher when traveling longer or pulling.

Thanks.

Bert

There was a bulletin for the 2005 and newer for the exact problem and they had to change the TPS and reprogram the system. The TSB is 05-14-4. The gas you used has no affect on it. Call the dealer to see if it's been expanded to cover yours.

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Bert