Posts Tagged: unmetered air engine

P2279 Code: What It Means and How to Fix It Fast

P2279 Code Explained: Intake Air Leak Diagnosis Made Simple Quick Summary The P2279 code is an OBD-II diagnostic trouble code that signals an air leak in the intake manifold system — specifically, too much unmetered air is entering the engine. This is most commonly caused by: • A cracked intake hose • Failed vacuum line • Bad PCV hose • Faulty mass airflow (MAF) sensor. Left untreated, it causes rough idle, poor fuel economy, and potential engine damage. The fix ranges from a simple hose replacement to more involved sensor … Read More