Automotive diagnostics
7 Engine Fault Codes vs Cheap OBD DIY Fixes
Answer: The P0301 code means cylinder 1 is misfiring, and fixing it starts with reading live OBD-II data, checking spark, fuel, and compression, then repairing the weakest link. Mechanics see this code most often after a failed spark plug or a clogged injector, but the root cause can be hidden