My code reader says PO300, PO301, PO304.

UP29BALNE1

MEMBER
1999 MERCEDES BENZ C230
80,000 MILES

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?

Wednesday, February 27th, 2013 AT 10:41 PM

2 Replies

CARADIODOC

MECHANIC
33,727 POSTS

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.

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Thursday, February 28th, 2013 AT 9:38 AM

UP29BALNE1