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I bought a 2003 Chevy impala with aftermarket stereo and my low pressure light is on and to reset the computer you have to use a stock stereo and there's some other issues how do I get around this
 

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Going out on a limb I'm going to assume you have the 3800 motor, low oil pressure on the info display points to a bad connection at the sender. Had this issue myself and the sender is on the filter block, pass side above the pan with 3 wires. Remove and clean with brake parts spray.
Resetting requires the factory stereo head, it also accesses the keyfob, chime and other program functions of the BCM and it must have a matching VIN number programmed... GM did not make this easy.
 
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