P0171 on Genesis: How to Diagnose & Fix
System Too Lean (Bank 1)
1 Genesis model · 1 documented issue · 1 critical
P0171 on Genesis by model: symptoms, diagnosis and fix
A manufacturing defect on certain 2021 G70 cars with the 2.0L GDI four-cylinder, built March 31–July 20, 2020, left a plastic burr on the low-pressure fuel pump's jet nozzle. The burr can block the nozzle and obstruct fuel flow to the engine, which can make the engine stall and increase crash risk, especially at higher speeds. NHTSA lists 319 affected 2021 G70s, a small and tightly bounded build population, so this is a VIN-check issue rather than a fleet-wide pattern.
Common Symptoms
- Engine stalls while driving
How to Fix
Ask a Genesis retailer to check whether recall 005G / NHTSA 20V569 remains open for the VIN. For affected vehicles, the recall remedy is to inspect and, if necessary, replace the low-pressure fuel-pump jet-nozzle housing at no charge. Stalling or fuel-pressure symptoms require professional diagnosis; a completed recall does not by itself rule out a later low-pressure fuel-system fault.
Sources for this issue (3)
P0171 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0171 mean on a Genesis?
P0171 stands for "System Too Lean (Bank 1)." This code means the engine's computer has detected that the air-fuel mixture on Bank 1 (the side of the engine with cylinder #1) is running too lean — meaning there is too much air relative to fuel. The computer watches the oxygen sensors and has had to add a large amount of extra fuel (long-term fuel trim) to try to compensate, but it has hit its correction limit. A lean condition can cause rough idle, hesitation, reduced power, and over time can run the engine hotter than normal. It usually points to either unmetered air leaking into the engine or not enough fuel being delivered. On Genesis it is documented across 1 model: G70.
What are the most common causes of P0171?
The most common causes of P0171 are: Vacuum or intake air leak (cracked hose, gasket, or PCV system), Dirty or failing mass airflow (MAF) sensor, Weak fuel pump or restricted fuel filter, Clogged or dirty fuel injectors, Faulty or aged upstream oxygen sensor, Leaking intake manifold gasket, Low fuel pressure or failing fuel pressure regulator, Exhaust leak ahead of the oxygen sensor. The specific cause varies by vehicle.
How much does it cost to fix P0171 on a Genesis?
Repair costs vary widely with the root cause and Genesis model; each issue on this page carries its own estimate where one is published.
Looking for P0171 on a different make?
View P0171 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.