Question about 2002 Audi A4

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Oil light came on and there is a knocking sound

Yesterday the oil light came on and there is a knocking sound in the engine. I was driving today and the battery light came on and the car imediately shut down. I had no acceleration and the steering wheel locked up. I was unable to jumpstart the car.

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  • mct1380 Oct 02, 2009

    As soon as the oil light came on I went and had the oil changed yesterday. They also added tx7 engine treatment that was suppose to help with the knocking.



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Sounds like the engine done froze up. No oil pressure= no lubrication= things melt together...
You can locate a previously used motor in a recycling yard or you can spend a fortune rebuilding that one, which is probably lunched.
Third choice, donate the Audi to a charity for a tax write-off. Buy another car. Pay attention to trivial matters like servicing and checking fluids.
Best of luck.

Posted on Oct 01, 2009

  • axl3 Oct 02, 2009

    That's like swearing off smoking, pizza and fries after the cardiac event.
    TH7, or whatever is was, is an additive which reduces friction but it, and all of the new oil in the world, won't repair physical damage to bearing surfaces.
    At the least you need a tear-down and inspection of the crankshaft, rod bearings, all that stuff inside the engine.
    Try turning the engine over with a wrench on the crankshaft pulley, make things easy, take out the spark plugs. If it moves at all, try spinning it with the starter motor.
    Knocking is caused by moving parts hitting each other, at that point it's endsville.


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You should never have driven the car today. The RED oil light and knocking sound was a sign of low oil pressure and was a warning to STOP. You may have done serious damage to the engine by ignoring this. Have the car towed to a trusted mechanic for repair.

Posted on Oct 01, 2009

  • NOT ME Oct 02, 2009

    Like the other posted said, no amount of oil additive will fix the damage that has already been done. You need to have the engine inspected by a professional to see exactly how much damage has been done. A compression test will help verify this. The oil pan may need to be removed. There is a reason this happened and it may be the oil pump failed, or another cause. More than likely the engine will need to be opened up. You will then have a decision to make. Overhaul this engine, replace it with a used engine, or sell the car as is.


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It sounds as if you seized the motor due to lack of oil ( very easy to prevent too bad you never checked the oil level )

Posted on Oct 01, 2009

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