OBD-II code · Fuel & Ignition
The engine is running lean — more air than fuel. The usual suspects: an unmetered vacuum leak, a dirty or failing MAF sensor, weak injectors, or a tired fuel pump. Too lean is a symptom, not a part.
Throw a MAF sensor at it ($250–$450 installed). On cars with a cracked intake boot or a leaking PCV valve, the code comes back in days.
Typical guess-and-swap cost: $250–$450 (MAF swap) when the real fault is a $30 intake boot
Smoke-test the intake for leaks, watch fuel trims and MAF reading against RPM on live data, check fuel pressure and volume under load. Lean codes have a short list of causes and a scan tool sorts them in order of likelihood.
Mobile service in Canyon Lake, San Antonio & Austin. Written report with root cause — see a sample.