So yesterday, driving along at about 40mph, lost power and car cut out. Car ran for no more than 10 seconds after power loss.
It would appear that the auxiliary belt was starting to shread itself. It was however still in One piece.
When I switched the ignition on, the old management light came on together with the oil light. Now the oil light is always on, and goes out when the car is started.
So in an effort to get parked in a better place, I attempted a start.
Seemed to turn over as normal, but wouldn't fire up.
The aux belt is run from the crank and does the air-con, the power steering, and the alternator. So although the aux belt was starting to shread, why wouldn't the car start ?
Even if I was to have cut the belt off, the car should still start, should it not ?
Thanks in advance for any thoughts or replies.

It's been known for a failed drive belt to cause the timing belt to jump. Hyundai Ioniq 5 Ultimate. The family car.
2009 Rimini Red SE TD4. Gone.
2006 Tonga Green i6 HSE. Gone.
Audi A5 convertible, my daily driver.
1972 Hillman Avenger GT, the project.

Thanks for the reply Nodge. Hope it has not jumped enough to do serious damage. have to find out a way of checkingto see if it has.

Timing pins is the only way to check. Unfortunately it's an interference engine, so timing belt jumping normally results in bent valves Hyundai Ioniq 5 Ultimate. The family car.
2009 Rimini Red SE TD4. Gone.
2006 Tonga Green i6 HSE. Gone.
Audi A5 convertible, my daily driver.
1972 Hillman Avenger GT, the project.

Yikes. I don't like the sound of that. Any other reason that you can think of why the engine management light might have come on under the circumstances ? Thanks for your help by the way.

If the timing has jumped, then the ECM will often register a crank / cam timing correlation error, which will result in the MIL coming on. Hyundai Ioniq 5 Ultimate. The family car.
2009 Rimini Red SE TD4. Gone.
2006 Tonga Green i6 HSE. Gone.
Audi A5 convertible, my daily driver.
1972 Hillman Avenger GT, the project.

Cheers Nodge. I will try and check it out tomorrow providing it stops raining.

The most likely cause is your shredded belt has damaged the CPS wiring/sensor. (Now Sold). 2008 Freelander 2 (Nazca Sand) SE TD4 Auto. Statutory write off & on WOVR for hail damage but still road legal.
171037Km as of 09/05/22
Superchips Bluefin Flash
Nanocom Evo II (also sold)

Badger51 has a good point. The CPS wiring is very easily damaged, as it's just a few mm away from the belt which has come adrift. If your lucky, it'll just be the wiring at fault. Hyundai Ioniq 5 Ultimate. The family car.
2009 Rimini Red SE TD4. Gone.
2006 Tonga Green i6 HSE. Gone.
Audi A5 convertible, my daily driver.
1972 Hillman Avenger GT, the project.

Thank you for the replies. The sun is out, so going to remove the wheel, and start taking a look.The timing belt was changed in 2022, about 18,000 miles ago. I will disconnect the battery while I do anything, and stick that on charge. I will keep you posted, and thanks again for all the help.

So I can see straight away that the Aux belt has started to spread, and that the tensioner appears to be out of line with the rest of the cogs. Ie, sitting forward towards the wheel. The wires to the crank sensor look quite oiled up. Going to drop the belt off now.

So the reason for the belt shredding is that the tensioner has started to fall apart, and split. The problem now is that I can see a bit of shredded belt poking up behind the crank cog. So now I need to look and see how to remove that crank cog in order to see what damage that has done behind the cog.

Good luck Jimmie,
I do hope it's not to serious an issue
and please keep us all, informed.  DAVE.

So, I have taken off the crankshaft fully, and cleared the bits of shredded aux belt, and given it all a clean. I have given the crank sensor a good clean, and put bit back on.
I'm going to put the crankshaft fully back on. Connect the battery, and see if the Blinking thing will start.
Hopefully, the shredded bits of belt that got in there haven't caused the timing belt to slip.
Please keep your fingers crossed if you are reading. Thanks in advance.