Bought a 97 Scooby Impreza turbo today and have intermitent Check Engine Light. Car will drive 30 miles then light will come on. Sometimes only 2 or 3 miles and light come on. Light will also go off after stopping and turning ignition off and back on. Sometimes light will go off by itself.
Any advice ? Serious or not !

 

Scoobypedia | Trusted knowledge for everything Subaru | Scoobypedia / Scoobypedia under the ECU heading shows you how to manually check for error codes.
Personally if it does come on then get it checked (by yourself via the above link) or take it to your local impreza specialist.

Does the car run alright?

 

Cheers for the prompt reply. First time l have had a Scooby and signed in to a forum site and l am amazed to find the prompt and helpful replies. Taking the car Monday to a garage who looks after my other cars and will stick it on the diagnostics machine to get the fault code. Looks like from what l have been reading as a MAF Sensor or a Knock Sensor. Will let you know the findings. Cheers Mate.

 

my eml light come on once wen car was low on oil toped up and was ok, long shot but check oil befor spending money for diagnostics

 

Car runs fine. Light has not come on at all today.
Will check codes thanks to your link and how to do it. Cheers.

 

Hiya my 98 does exactly the same.

Check engine light comes on whenever it feels like it but the car feels fine. If you look on Jolly Green Monsters website there is a guide to checking the fault codes and it is really easy to do. Please check it out before you pay someone to read the ecu. If you can operate a pc then you will have no problem doing the scan yourself. Its simply plugging two wires together and turning on the ignition plus the wires are easy to find you cannot go wrong. I did mine in less than ten minutes and gave me two codes replaced both parts and all is now good.

Steve

 

Cheers mate. Had a look on website and like you say sounds simple enough.
Have not had a chance to run test yet as its the usual british summer in Carlisle. "Raining" Looks like a MAF or KNOCK Sensor fron the other replies l have received. Was yours a MAF or KNOCK Sensor ?
When l get round to it l will let you know the result and fix. Many Thanks again.

 

Mine was the knock sensor but it threw up the maf as well the first time i did the test. I just changed the knock sensor and reset the ecu seems fine now.

 

My car seems to be coming with knock sensor error and Maf sensor aswell but it only comes on now and then but other day it was juddering abit think its to do with the maf sensor. Where did u get your knock sensor from VTR steve?

 

Got mine from the main stealers think it was about £120

 

Woah just for a piece of wire with a sensor on the end. Hehe. Think i might risk it and get a second hand one.

 

I would get a new MAF possibly borrow a new one ,reset the ecu and see if the knock sensor fault comes up again as if the maf is faulty it could cause problems for the knock sensor.

 

Cheers for the help. Have not got the fault code as yet as its still raining ! If its knock sensor code or maf or both l think l will try the knoch sensor first like you and keep my fingers crossed.

 

The error code l am getting is Knock Sensor Error code 22.
No other codes flashing. Thanks for your help.

 

New knock sensor fitted and still have check engine light on. Have not reset ecu as yet. Hope it puts light out after reset and the problem is sorted. Fingers crossed.

 

Think the ecu stores the code so you will need to reset it once the new part is fitted and all should be good. Good luck

 

Cheers Steve. Got bloody soaked and scratched to bits fitting new one.
Rained all day here. P.S. Read somewhere that the knock sensor needs torqued to 24nm which l have done. Will let you know the result when reset.

 

Ok Fit new knock sensor. Tried ecu reset. Still has Knoch Sensor Fault. 2 long flashes and 2 short flashes. Error 22 Knock Sensor. No other codes displayed. Heeeelp Please.
What next. Should l run the car etc.