Thread: P0300 and P0304
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Old 05-06-2010, 06:55 PM   #1
KevinH1990
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Location: Virginia
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P0300 and P0304

I have a 2000 Boxster with a 2.7 liter engine. I was leaving my neighborhood this morning and my CEL flashed 4 or 5 times and then stayed solid. I drove it home immediately.

I have a Durametric and the codes are:

P0300: Porsche fault code 62 - misfire damaging to cat converter

P0304: Porsche fault code 66 - Cylinder 4 misfire damaging to cat converter

I changed the spark plugs at 30,000 miles when I bought the car and now have almost 56,000 on the car. The spark plug change interval on the 2000 model year cars is 30,000 miles.

Based on some other posts, the problem could be a coil pack. Does anyone have suggestions for repair?

The CEL isn't flashing, but based on the description of the code, I would have it flat-bedded to a shop if I can't repair it myself.
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