CEL with P0326, P1123, P1125 advice for a newbie.
 

Hey all! Newbie ‘99 986 Boxster owner, I’m getting a reoccurring CEL with P0326, P1123, P1125. I’ve cleared it once and drove for a bit with no issue. Today after a bit of driving and giving it a bit more throttle, this code combo popped up again. I did notice some hesitation at 5-6k rpm. I’m still on the first tank of gas since purchase and apparently it was sitting for a bit.

For the P1123 and P1125, I’m thinking of trying some fuel injector cleaner. Possibly a fuel filter change. Is this a good starting point?

Looking for some advice on the P0326 - Knock sensor 1. This one sounds scary, but is it just that there is an issue with the sensor? Or, caused by the other codes? Or did it detect a knock which sounds bad.

Check out https://www.renntech.org/topic/50571-986-boxster-error-codes-p1123-p1125/
They discuss that. If you have a Durametric it could be possible to activate the purge valve, I performed that on my 997 to rule out a failure of that valve. Edit: It is clicking when activated
P0326 might be fuel related or something with the sensor itsself. I had a cracked Sensor. You could change the sensors against each other and see if the failure follows, then swap the sensor. You could test wiring/voltage first.

Thanks, for the info and suggestions! TIL what a Durametric is!! So much to learn and so many toys to buy :)