Code dictionary Generic OBD-II
P0300Random/Multiple Cylinder Misfire Detected
This is a definition, not a repair instruction. It does not identify a failed part or establish that a vehicle is safe to drive.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Separately researched
Vehicle-specific diagnosis
These guides address the exact vehicles and conditions in their sources. Select the guide that matches your vehicle.
Toyota
Toyota Camry and Avalon V6 P0300: when calibration is the right branch
Match the high-load event and installed calibration before programming.
Honda
Honda CR-V P0300 and P0172: separate update, plug and camshaft branches
2017–2018 CR-V: repair history, spark-plug findings and a separate noise inspection determine which Honda procedure applies.
Ford
2018 F-150 P0300 and P0171: when injectors are actually implicated
Follow the code and build-date branches before approving injector replacement.
Porsche
Porsche Cayenne and Panamera camshaft codes: evidence before an engine estimate
Read the fault combination, mechanical findings and campaign history as separate pieces of evidence.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT