1999 Mercedes Benz C230 Code Reader Po300 Po301 Po304 Which Multiple Cylinder

1999 MERCEDES BENZ C230
80,000 MILES
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UP29BALNE1
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  • 65 POSTS
My code reader says PO300, PO301, PO304, which is multiple cylinder misfire, cylinder #1 misfire and cylinder #4 misfire. Can you tell me where I should begin looking. Could it be a spark plug wire or in the cap?
Feb 27, 2013 at 10:41 PM
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CARADIODOC
  • ✓ASE Certified Mechanic
  • 34,321 POSTS
  • ASE Certified Mechanic
Spark plugs and wires are the most common cause of misfires. If new ones don't help, swap some injectors, then see if the misfires show up for different cylinders.
Feb 28, 2013 at 9:38 AM
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UP29BALNE1
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thank you, I will start there and hopefully that is it. I will let you know. Thank you again and this site.
Mar 4, 2013 at 7:15 PM
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