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Q:

knock sensors on 2001 Chevrolet Suburban 1500

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the engine service soon indicated on the lcd panel.
(1) Answer
The service engine soon light indicates that the powertrain control module has detected a fault with one of its sensors or controled systems. A fault code has been stored in the computer which can help lead to the cause of the fault. For more information please look in the encyclopedia at www.repairpal.com