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Engine failsafe

Discuss your latest mods or ideas, and anything to do with the BMW X5 (E53).
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henrym3
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Engine failsafe

Post by henrym3 » Wed Feb 25, 2026 8:56 pm

Two days after fixing the engine cutting out problem up pops the fail safe warning and other lights. Engine continues to run but surges and lacks power. Switching off fixed for 20 meters then returned. Diagnostics tells me that the fault is potentiometer 1 and 2 in the throttle pedal. So took the pedal off ( 30 second job) and removed the electrical connection and sprayed electrical cleaner. Didn’t help so sent for a second hand one from a national scrapper £44. Meanwhile started looking on internet at what else might be contributing to the fault. Came across one of these magic fixes which says:-
Disconnect battery for 5 minutes, to difficult to remove LPG tank so took pedal off again and disconnected the electrical connection. Cup of tea later put it back together and switch on ignition. Press pedal to floor over a 4 second period. Release over a 4 second period. Switch off ignition. This will apparently reprogram/realign/reset the throttle. Yea right. Start up, and everything is perfect obviously haven’t done many miles but will report if it packs up again. New pedal due tomorrow so will bung it in the boot as you could change on the side of the road in 30 seconds.

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Alan Gunn
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Engine failsafe

Post by Alan Gunn » Thu Feb 26, 2026 6:32 am

The old magic reset does work sometimes lol.

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henrym3
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Engine failsafe

Post by henrym3 » Thu Feb 26, 2026 1:39 pm

Somehow I just can’t get my head round that this is a permanent fix. It’s like the window fix from a few weeks ago, I still operate the window switch every few days to see if it still works.

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Leslie
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Engine failsafe

Post by Leslie » Thu Feb 26, 2026 4:41 pm

Stick the pedal on when it arrives, sounds like a wear issue inside will only work for a short while possibly :driving: given the recent issues maybe an exorcism is needed :rofl:

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