carl heath

hi all i have my 02 sti and ecu light keeps coming on with 0304 missfire on 4, i have took it to subaru and have said to change maf sensor,but was told by simon at jgm it could be nps sensor before i got subaru to check it,the guy at subaru said it would show missfire on all 4 cylinders if it was neutral position switch sensor.so im asking all would you go for maf as it is 242 pounds !!!!!! also someone posted that a company sold second hand ones that are tested first for 50 pounds,does anyone know who those people are please,any help on this issue would be great thanks

joz8968

iTrader: (13)

I'd always change the cheapest item first, which surely is the NPS? Prob about £80 max brand new from Subaru(?).

Like with any 2nd hand sensor, you take a chance with it lasting for any length of time - bit of a gamble. Personally I'd grit my teeth and always get new items (at least you are ruling them out if the problems remain - so can move on to something else...).

Splitpin

You can get the original Subaru MAF sensor for considerably less than that if you shop around.

Don't bother. It looks like a tasty saving but you can't trust a secondhand airflow sensor, no matter how much someone may tell you it's been "tested". You need the reassurance of a new replacement to determine whether or not this is the cause of the fault. If you buy a secondhand one and the issue remains, could it be that the replacement is also faulty? The only way to be certain is with a new part.