Engine Trouble. Would love some help. AOS?

[EJ_2001_986_S]

Originally Posted by DennisAN

Driving a car with a misfire can wreck your expensive pre-cats. Boxster pre-cats are $1,700 EACH.

Normally P030x codes are misfires caused by ignition problems, and are detected by the crank angle sensor. In other cars I've had them from a dirty MAF sensor wire too. Do you have an oiled air cleaner element?

Thanks for the note on potential damage to the pre-cats.

Everything with this engine is 100% stock. Genuine Porsche air cleaner that was changed 5000 miles ago by me.