these days you can plug in a computer and most of the time it’ll tell you what’s wrong. Bad sensor, change sensor, done.
Newp, dtc’s just give you a ball park idea of where to look, you need to know how to interpret the data the diagnostics are telling you
Take Marcos scenario up there, but swap it with a common failure in a Nissan – The dct code will say cam sensor outside of parameters, and most people swap the cam sensor, and wonder why it still won’t start.
So £30 down the pan before you even start…
The fault most times will be timing chain stretch or variable valve timing unit gone west because someone tried saving money on a timing chain job… A horrible task involving driveshaft and sump out, so it’s prudent to buy a full kit rather than just a chain and tensioner.
The number of these I’ve seen as non runners and in the boot or cab you’ll find a cardboard sensor box