Hello, my name is willie and i am having the same problem with my brother-in-laws car. It's a 1988 olds ninety eight and the problem is code 41 which is one of three items but has been narrowed down to the camshaft sensor signal loss, the sensor has been replaced and the wiring is good so i assume it's the interrupter that is bad on the camshft which is a eight dollar part but i see no way to replace the interrupter without pulling the timing chain cover and that is something that i am not sure i want to tackle myself but your comments confirms my idea of whether or not the timing chain cover needs removed in order to replace the interrupter. Thank you.