Nissan code
P0171: on a Nissan
How much to fix P0171 on a Nissan? Typically $120 to $390 for mass airflow sensor replacement, the most common fix. This is an estimate, not a quote.
On a Nissan, P0171 often points to the airflow sensor or the intake boot before it points to anything deeper. Nissan sensors are known to get dirty and read low.
General meaning of P0171: The computer keeps adding extra fuel to make up for something, and it has reached its limit on the side with cylinder 1. This is called running lean, and it usually means unmetered air is sneaking in or fuel is not getting through. See the full P0171 page.
Models to know about
| Model | Years | What to know |
|---|---|---|
| Altima | 2007 to 2018 | Both the 2.5 and the 3.5 V6 appear in repair cases. |
| Rogue | 2008 to 2020 | The 2.5 engine is common, often tied to the intake system. |
| Sentra | 2007 to 2019 | Small engines with a CVT in later years. |
| Frontier | 2005 to 2021 | The older 4.0 V6 carries many repeat cases. |
Common causes on a Nissan
- Airflow sensor contamination. A cleaning sometimes clears it for a while but replacement is the lasting fix.
- Cracked intake duct, especially on Frontier and Altima where the rubber is thin.
- Failing air-fuel sensor on the 2.5 after 100,000 miles.
- Leaking intake manifold gasket on the 3.5 and 4.0 V6 engines.
NHTSA's public complaint file shows how owners describe this kind of trouble: the 2010 Nissan Altima has 381 complaints on file, and 18 of them use wording like check engine, lean, P0171, idle; the 2013 Nissan Rogue has 610 complaints on file, and 41 of them use wording like check engine, lean, P0171, idle. Complaints are owner reports, not proof of a cause.
Check this first
- Pull the intake duct and inspect both ends for cracks.
- Check long-term fuel trims with a scan tool. Positive trims over 15 percent are a clue.
- Look for oil in the airflow sensor housing.
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $70 | $250 |
| Labor: 0.5 to 0.8 hours × $110 to $150 an hour | $55 | $120 |
| Fees: shop supplies, disposal, diagnostics | $0 | $15 |
| Total, rounded | $120 | $390 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in the US, $27.13 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
Airflow sensors are the pricey part. Aftermarket is workable if the brand is a known one, and a shop that cleans first before replacing is saving you money.
Other repairs that may be involved
| Repair | Typical range, US |
|---|---|
| Mass airflow sensor replacement | $120 to $390 |
| Vacuum leak repair | $90 to $460 |
| Oxygen sensor replacement (one sensor) | $100 to $350 |
Questions to ask the shop
- Did you scan the fuel trims first?
- Is the airflow sensor being replaced or cleaned?
- What is the warranty on the part?
Got a quote already? Check it against the range. Wondering if a recall touches this problem? See Nissan recalls by model or check a VIN.
P0171 on a Nissan: questions
Can P0171 on a Nissan damage the CVT?
No. The CVT is unrelated, though a rough engine can feel like a CVT problem.
Should I replace the O2 sensors?
Only if the tests point there.
How much does it cost to fix P0171 on a Nissan?
The most common fix, mass airflow sensor replacement, has a typical range of $120 to $390 across the US. That is an estimate built from parts prices and local labor wages, not a quote. Your model, engine and shop move it.
P0171 on other makes
Sources
Written from public NHTSA data, owner-reported patterns and general repair knowledge, in our own words. Model lists are examples, not a full list, and patterns are not a diagnosis. Prices updated October 2026. Not a repair shop, estimates only.