Meaning
What P0171 Means
P0171 means the engine is running too lean on bank 1.
OBD code guide
P0171 Code Meaning & Repair Cost
P0171 means the engine is running too lean on bank 1.
Meaning Common causes Repair costs
Can I drive?
Driving Guidance
Use this as planning guidance. If the car misfires, stalls, overheats, or the light flashes, get help quickly.
Causes and symptoms
Common Causes and Symptoms
Codes are clues, not final diagnosis.
Vacuum leak
A mechanic should confirm this before replacing parts.
Dirty mass air flow sensor
A mechanic should confirm this before replacing parts.
Fuel pressure issue
A mechanic should confirm this before replacing parts.
Exhaust leak
A mechanic should confirm this before replacing parts.
Rough idle
A mechanic should confirm this before replacing parts.
Hesitation
A mechanic should confirm this before replacing parts.
Related repairs
Estimated Repair Costs
Open related repair pages to compare parts and labor before approving work.
FAQ
P0171 questions
P0171 means the engine is running too lean on bank 1.
The broad planning range is $100-$850, depending on the confirmed part and labor time.
If the vehicle runs poorly, overheats, misfires, or the check engine light flashes, avoid driving and get inspection quickly.
Yes. Clearing a code does not repair the root cause. If the fault remains, the code usually returns.
Compare diagnostic fee, parts brand, labor hours, warranty, and whether related causes were inspected.