no start on 1996 Audi A6 Quattro

no spark w/new computer and crank sensor

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2 answers
your car has a speed sensor, position sensor and a cam sensor. if one of these don't work it should leave a code in the eng module. the coil should be tested too, assuming the fuses are all good. does the fuel pump run when cranking? knowing this would help narrow the coises a bit.
had same similar problem changed batteries in key locked door with key set alarm set when alarm went off used key to open door put key in ignition car started just fine after that