I have an 1997 Audi A4 1.8 SE. Towards the end of a long motorway drive the power steering failed, a few miles on from there the engine started overheating and both the coolant and then the battery light came on (my battery is new). Does anybody have any idea what the problem might be?

When was it last serviced? How many miles has it done?

check for loose mud flaps

stopped in drive, engine shook is gross missing.
the belt snapped on front of engine, causing PS assist to end.
time for a new belt.
they last about 50,000 miles, best is to keep eye on belts.
or can be a long walk home.
or very expensive tow job.
the bent runs many important things, do not run the engine like this.

would this sensor going cause the car to go into limp mode? have a slight knock sometimes from under drivers side when car excelorating, now its started going into a limp mode when seemingly on bypasses and motorways but car runs fine on normal roads

either broke the drive belt for your accessories or you have a pulley that is preventing the belt from turning- is the only way those systems will fail like that.

Check your belts. Sounds like something failed and either threw the belt or or the belt broke.

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i had to call every scrap dealer in england(nearly) to find a compatible unit.(skoda.vw.audi.with same output will fit,BUT they produce power differently at different engine speeds...)the blocks/heads are the same though.i managed to get the whole front end of the car for about £1000. NOT CHEAP.if the block was not damaged ,only the head and pistons/rods.your looking at around £1200 for new.../250 scrap head

Check the gearbox oil - has this been changed (with the wrong grade) just before the problem started ? May also be too little oil, from a small leak - which will get very thin when then inevitably overheating. Best to change the gearbox oil, note if lots of sludge or debris comes out (or is attached to the drain plug). If oil is the problem, total siezure may be just down the road.

change ur fuel pump ,

check lower stearing shaft u joint...