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How to fix p0304 on 2002 c240 mercedes

Replaced maf ran great but when it warmed up started to miss and got p0304

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  • Dodge Master
  • 17,970 Answers

Hi there:
DTC P0304 Code - Cylinder #4 Misfire Detected
A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

A code P0304 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Feb 24, 2012

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

SOURCE: Replace Cabin Filter in my 2002 C240 Mercedes Benz

after changing air filter and spark plugs engine still shakes ???

Posted on Jun 19, 2008

alicantecoli
  • 22114 Answers

SOURCE: 2002 mercedes-benz wont take my key

sounds like it needs a new steering lock

Posted on Mar 31, 2009

  • 297 Answers

SOURCE: What is a service A for 2002 mercedes c240?

Their are different kind of services, the more you drive, the more and deeper service is required ! get your self a owners manual, all required service intervals should be listed. If this is your question ?

Posted on Aug 11, 2009

jasperoni
  • 203 Answers

SOURCE: How To Change Oxygen Sensors in 2002 Mercedes C240 Sedan?

I do not know the part numbers but you have 4 sensors. 2 pre and 2 post catalytic converter. The pre sensors are the most sensitive and are generally the ones to fail. the rear sensors usually have a heater circuit problem. If your just replacing them for routine service interval I would just do the fronts. They connect to the engine wire harness in the front of the transmission pan. You may need an o2 sensor socket to remove the fronts. They are just a 22mm. in size.

Posted on Oct 18, 2009

Testimonial: "Thank you for the reply...I appreciate your time! Will replace front O2 sensors and see if check engine light goes out...thanks again...Jamie."

gaz-dee
  • 62 Answers

SOURCE: my remote control key will not turn ignition on

have you tried replacing the battery?

Posted on Oct 28, 2009

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