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P0304 means the # 4 engine cylinder is misfiring

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On a 1998 Ford Explorer :

4.0 liter V6 engine ( OHV and SOHC )

firewall

3 - 6

2 - 5

1 - 4

front of vehicle

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5.0 liter V8 engine

firewall

4 - 8

3 - 7

2 - 6

1 - 5

front of vehicle

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12y ago

What else can I help you with?