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P1399

Hello. A random misfire can be caused by many different things such as dirty fuel injectors (https://www.yourmechanic.com/services/fuel-injector-replacement), a weak fuel pump (https://www.yourmechanic.com/services/fuel-pump-replacement), a bad fuel pressure regulator (https://www.yourmechanic.com/services/fuel-pressure-regulator-replacement), fouled spark plugs (https://www.yourmechanic.com/services/spark-plugs-replacement) or wires (https://www.yourmechanic.com/services/ignition-cable-spark-plug-wires-replacement), a failing ignition coil (https://www.yourmechanic.com/services/ignition-coil-replacement)...

On Honda vehicles the OBD code p1399 indicates that there is a random misfire occurring in the engine. In most cases a valve adjustment will correct this issue, however a blocked passage in the EGR (Exhaust Gas Recirculation) system can...

All these codes point to engine misfires. You should pull the spark plug wires (https://www.yourmechanic.com/services/ignition-cable-spark-plug-wires-replacement) to see if oil is on the spark plug wires causing the misfire. You would need to replace the valve cover gaskets (https://www.yourmechanic.com/services/valve-cover-gasket-replacement) and spark...