P1304 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

P1304 Code failures by brands

P1304 HONDA, ACURA: RANDOM MISFIRE DETECTED ON #4 CYLINDER

P1304 MINI, BMW: CYLINDER 4 MISFIRE DETECTED

P1304 SAAB: CYLINDER 4 MISFIRING DETECTED

Description of DTC code P1304

The voltage required for the engine to start is sent by the Ignition System based on the 12v battery. Through the spark plugs, the system provides the voltage and in this way, the fuel mixture is ignited. In this complex process, components such as distributor, coil, and spark plugs, among others, are responsible for carrying the necessary voltage.

The fault code P1304 OBD2 in certain manufacturers is used to indicate that problems have occurred in the operation of cylinder 4 of the engine, which has deficiencies in the ignition.

Symptoms of fault code P1304

  • Check Engine lamp illuminates.
  • The engine has trouble starting.
  • Incorrect engine performance.
  • Poor acceleration.
  • Exhaust emissions increase.

Causes of OBD2 P1304

The reasons for setting the P1304 OBDII diagnostic code are:

  • Ignition coil wiring may be deficient.
  • The spark plug on cylinder 4 may be bad.
  • The ignition coil may be defective.
  • The fuel injector for cylinder 4 could have been damaged.

Possible solutions of the DTC code P1304

In order to correct the DTC P1304 OBD2 code consider the following:

  • As a first step consult the Technical Service Bulletins.
  • Check with a scanner if other codes indicating problems in the operation of the ignition system are configured together with the DTC P1304. Diagnose the codes according to the order obtained.
  • Check and verify the good condition of the ignition system components. If deficiencies are found in one of these, proceed with the necessary corrective actions.
  • Verify that the injector circuit for cylinder 4 is working properly. If common damage is found in one of the components of the injector circuit, make the corresponding repairs.

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