got the swap done last night (h23a )started right up and then the cel came on . so today i checked the cel and it was code 4 and 10 so code 10 was fixed (replaced iat ) now for code 4 (crank angle sensor) . im useing a p28 chipped with the same tune the previose owner gave me witch he used in a chipped and converted p06 with my p28 code is throwed and with a p75 chipped ecu it is fine . Is the p28 i have bad any help .

 

Make sure the wires are good from the computer to the sensor and back to the computer, if all checks good, then I am afraid you will need a distributor or sub assy to save money, only get OEM new or used or reman but not Aftermarket.

Ohming the sensor is not a good final test, you need an oscilloscope to see what it is doing to be sure, it also could be intermittent.