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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?
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Base 2000 986, beater 1996 Miata, 2011 Suzuki SX4 AWD
Feline mechanics Condoleezza and Dukie
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