Check engine code reads P0304, what does this mean?

Asked by Mar 05, 2017 at 11:33 AM about the 1997 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

engine light came on , water is fine and oil and votage is okay what is the problem??

1 Answer

55,415

P0304 is a miss-fire of the #4 cylinder. #4 is the rear cylinder on the passenger's side. Possible causes are bad sparkplug, bad ignition coil, bad fuel injector, problem with the injector electrical connector. How many miles on this Mercury? When were the spark plugs last changed?

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