I wonder if you guys could give some advice,my car is a 94 jdm wrx, the car starts an runs ok but every now an then after driving for a bit I try An start the car and it wont start, turns over but won't start, leave it 5/10 mins and will start with a cough and splutter then is all gd.

So today I checked ecu codes and it threw up 11,21,31,42 and 45.
Crankshaft position sensor, engine coolant sensor, tps, Idle switch and pressure sensor.
Now is this telling me all these sensors are shot? Do I have to replace this all to solve the problem, not really sure which direction to go was not expecting all these fault codes tbh.
Any feedback would be great , thanks in advance

 

Coolant sensor first then crankshaft position sensor in my opinion.

 

Reset the ecu first then see if any error codes come up again then start thinking about changing the sensor(s).

As above the coolant temp sensor is a known culprit for dodgy starting problems.

 

I've reset ecu , done hour or so driving nothing as yet come up so think I might get temp sensor first. Where is that one can't seem to find it, someone said behind alternator but all I find is a sensor with a spade connector ?

 

Have the symptoms you mentioned reappeared? If not no need to change the sensors.

https://www.scoobynet.com/general-te...ult-codes.html

 

coolant tem sensor is located looking at engine from front of car look under inlet manifold towards the turbo side of engine look by inlet manifold you will see a sensor going into engine block i think it has brown connecter may be hidden by pipes that the coolant temp sensor

 

i had the same problem changed the temp sender and still had the problem, then i decided to clean the idle air control valve and that solved the problem

 

Thing is I only drive the car every now n then at weekends , this weekend I've used it more than usual so noticed it more. It's more annoying than anything. It only seems to do it when warm cos it starts first time on the button. And resetting the ecu will have no effect on offending sensor will it ?