QUOTE(FlacaProductions @ Mar 27 2024, 03:10 PM)
Seeing both part numbers seeming used interchangeably between 1.7 and 2.0's.
Was there a year that a changeover was made or?
041 is a 71-72 1.7 sensor
043 is a mid 73-74 2.0 sensor
Not interchangeable, at least not out of the box without modifications.
There were quite a few different MPS used across the various years and engines in the 914, 5+ different versions for the 1.7s and 4+ different versions for the 2.0s and while they are physically interchangeable and you can usually get a car to start and run with the wrong MPS they will not run correctly unless you have the correct MPS for whatever ECU you are running. The parts all contain different calibrations as well as some internal differences that impact their function as well.
The most common MPS part numbers you will see are
041 72 1.7 sensors
049 73 1.7 sensors
037 early 73 2.0s
043 & 044 73-74 2.0s
052 75+ 2.0s
There is some level of interchangeability with some of the sensors but thats a pretty in depth subject, in general though you dont want to swap any of the 1.7 sensors with any of the 2.0 sensors and you dont want to swap the early 73 2.0 sensor with anything.