Engine light on

Most car dealers recommend maintenance services at 30K, 60K, 90K and so on. The 30K service is mainly focused in inspection of the systems and replace of the fuel filter.
The 60K is expensive for cars with timing belt. The coolant, transmission oil and filter, and the brake fluid has to be changed. The air filter and spark plugs has to be replaced at this time too.
Most costly is the replacement of the timing belt. Volvo recommends for Volvo 240, changing the timing belt every 50,000 miles. Needless to say, they are pretty religious about this now.
The B20, B21, B23, and B230 engines are non-interference engines, meaning that the camshaft can be rotated independently of the crankshaft and no damage will result to the engine. That is, if the timing belt breaks, the valves will not hit the pistons; the engine will simply stop.
On the other hand, the B234 16-valve engines and any of the other Volvo multi valve engines are interference engines. Loss of the timing belt in these engines will result in severe or fatal engine damage.

my truck(2007 silverado 5.3) died at red light got it started back and had knocking noise in engine and like not running on all 8 cylinders only 55000 mile barely made it back home, had to keep foot on gas and brake to keep it running,will not start unless i mash accelerator pedal,PLEASE HELP, I JUST BOUGHT THIS TRUCK

Even your car Audi A4 1.9 TDI has got 55000 km and the timing belt replacement is due at 90000 km, the car was made in 2003. I strongly recommend you to change now the timing belt in order to prevent any risk!

It has a timing belt. Recommended to be replace every 105,000 miles, timing belt also run's your water pump good idea to also replace, your engine is also an INTERFERENCE ENGINE which will damage your cylinder head valve's if timing belt goes bad. Hope this was very helpful.

90000 MILES IS SCHEDULED MAINTENANCE INTERVALS.

Depending on the engine size but yes it is true and more likely if you use non-genuine parts you will have to do that at 55000 miles or 90000 km. 60000 is a manufacturer/dealer service standard but I would not want to try the limits. Engine costs much more than a timing belt kit.

Yes this should not cost you anything. it's covered under the power train warrenty.

Depending if you kept up with recommended maintenance as per factory. If you did this is what the factory sheet suggests for 90000 Miles checkup :
Diagnose / Test Vehicle : verify parking brake operation
Inspect : Battery Brake fluid Brake pad Coolent Drive belt Fluids Power steering fluid Tires Windshield Washer Reservoir
Replace : Air filter element Cabin air filter Engine oil and sump washer Engine oil filter Wiper blades

get the codes read,get the throttle body update (free from volvo) done,reset service by holding odometer button done and turn on key till lights come on dash and what approx 5 second release and turn off key ,you may need to do it again until it works

you said you had the fluid changed ,this car takes a very exp. and special fluid ,where was it done ,do you have any check eng lights on?