OBD-II Code: P0171
MEDIUM SEVERITY
Fuel
System Too Lean (Bank 1)
Can I Drive?
Usually short-distance only; diagnose soon
Stop driving if you notice overheating, bad misfires, loss of power, fuel smell, or flashing warning lights.
Common Causes
Vacuum leak, weak fuel pump, clogged fuel injector, dirty MAF sensor
DIY Checks
Inspect vacuum hoses; clean MAF sensor with proper cleaner
Mechanic Questions to Ask
Fuel pressure test, MAF sensor diagnosis
Disclaimer: OBD code information is educational, not a professional diagnosis. The same code can have different causes depending on vehicle, mileage, maintenance history, and related codes. Always verify with a qualified mechanic.