Trifecta cleared itself, cause never found.

Today's issues are low voltage to intake air temp sensor and a reading of -40c

100% dead drivers seat controls.

Hopefully fuse 20, 21 or 13/44 and an obvious reason why...

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What did you do to / for your E53 today??
 

You ever get rain? My self-clearing trifecta was wheel speed sensor connectors.

Most intermittent trifecta are bond wires inside the abs brain. Heat cycling breaks the wires they didn’t engineer stress relief into the lengths.

Can you move your steering wheel? Can you access the seat control with foxwell (did you get that sorted)? Lots of electric fault starting to feel like a damaged loom.

–awr–

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I rotated the tires and changed the oil yesterday, 48,042 miles. 920 miles since last oil change, slightly over a year ago. High-mileage Mobil 1 5w30... for the age, not the mileage :thumbup:

https://i.imgur.com/8ZeXtgc.png

I wouldn't worry about it unless it does not reset. I've found on mine that low voltage will cause the trifecta to turn on. Even a low battery crank to start will cause the light to turn on.

This is how I know when my battery is needing a charge - the 4x4 light pops up during cranking... goes out once engine starts though.

That’s neat feedback


–awr–

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Only problem for me is that I have a new battery and I'm getting 14.1v to 14.3v while running and battery shows 12.7v after engine shutdown.

Normally it'll stay between 14.1/14.2 or 14.2/14.3 but if it shows 14.3 and drops to 14.1 is when the intake sensor goes wonky. [emoji2369]

All fuses were good and on startup... everything was back to normal, seat included... I'm after of the fun I'm about to have![emoji28]

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-40 is likely open circuit, I think the intake temp sensor is in the MAF on the V-8s as Wayne pointed out in another thread.

I thought he was saying ambient air temp (from bumper duct). Did you mean ambient or intake? I went to ambient because I’ve seen the -40 when it’s unplugged before.


–awr–

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Intake

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