i've only had my 2003 wrx for 4wks so im still in the "honeymoon period"- well should be but im having A NIGHTMARE!
heres the problem so far: https://www.scoobynet.com/general-te...lems-help.html

so far i have replaced the lambda sensor and intercooler+ y pipe cos they looked worn.......but no change in the car it has since failed emissions at mot due to being de-catted which i was unaware of.
rescanned it for faults and found 5 faults:
p0102-maf sensor low input
p0302-cylinder 2 missfire
p0304-cylinder 4 missfire
p0113-intake air temp circuit high input
p0546-exhaust gas temp too high

can anyone shed some light on my next move-
change spark plugs? maf sensor?iat sensor?

my wife wants to get rid of the wrx already and the longer this continues i wont have much choice!!

 

take it to have a full diagnostics mate will work out cheaper than replacing everything also might be worth checking if its got a standard map on it mate because if there was no cel but decatted may have been mapped out and swapping stuff around after a map without a tweak wont do it any good mate

 

just read the other thread mate defo needs a map for the cone filter had one on my bug for about a week before i got it mapped and it got miss fire codes on boost also oiled filter types can kill mafs aswell mate so that may be fooked hence maf cel

 

well i was planning on putting in a panel filter or the standard one back, get it back to sucking in cold air-
how do i know if its remapped?
will the diagnostic find everything thats wrong and tell me what to change? does it have to be subaru that does this check?
sorry for the questions, my brother is the mechanic in the family but he's moved so i now have to get my hands dirty

 

a mapper or subaru garage could tell you they will just flash up the ecu and it dont have to be a subaru garage to do the diagnostics i would get a independant specialist to do it if you have any tuning garages up your way or some mappers will also do it mate i would change the filter back first reset the ecu and see how you get on also you can clean you maf sensors mate using electric contact cleaner and a cotton bud so try them first