Check engine light code 22

ssmithr32

Member
Quick question this error.

The check engine light comes on when you start up (not everytime, but regular enough), it goes out after about 5-10 mins of driving.
Don't think it's dependant on engine being warm as comes on when you stop and go again a few mins later.
Only symptom is it struggles to idle for a minute. Revs can drop right down and nearly cut out but sorts itself out. Other than that car runs fine..

The airbag light comes on/off with the CEL, maybe that's an Impreza thing.

It's a 1997 GC8 version 4 WRX.

I read the code and showing as 22, knock sensor. I've order a knock sensor and will take the old one off to check it before it arrives.

Just wondering if anyone has had similar and am I going in the right direction replacing the knock sensor?

This has probably been happing since before I bought the car just over a year ago. To my own stupidity I only just realized both airbag and check engine light had black tape over them to cover it up.
 
Replaced the knock sensor today, seems to have fixed it thankfully. Will see after a bit more driving.
Not the easiest of jobs.
 
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