P0171 on a 2015 Chrysler 200

P0171 means the engine computer is adding more fuel than normal on bank 1 because it sees too much air or not enough fuel.

Not your vehicle? See general P0171 info.

Most common causes on the 2015 Chrysler 200

Ranked from 1,983 NHTSA owner complaints filed for this vehicle.

Sort by:

1
Weak or failing fuel pump
Medium severity
An independent mechanic linked this vehicle's no-start/performance failure to the fuel pump, and a separate misfire/check-engine complaint on the same model also required fuel pump replacement.
Reported in 2 NHTSA complaints
Parts:fuel pump
2
Failing oxygen/air-fuel sensor
Medium severity
Owner reports recurring shop visits for an O2 sensor tied to a persistent check-engine light and safety concern.
Reported in 1 NHTSA complaint
Parts:oxygen sensor
3
Clogged/dirty fuel injectors or throttle body
Low severity
Owner cleaned the fuel injectors and throttle body while chasing a persistent misfire/check-engine condition on this vehicle, indicating fuel-delivery/airflow contamination was suspected.
Reported in 1 NHTSA complaint
Parts:fuel injector throttle body
4
Vacuum or intake leak
Medium severity
A cracked hose, brake booster line, or intake gasket lets in unmetered air, producing a lean condition most visible at idle.
Common cause
5
Dirty or failing MAF sensor
Medium severity
A contaminated or drifting MAF sensor under-reports incoming air, causing the ECM to under-fuel and trip a lean code.
Common cause
Parts:mass airflow sensor
6
Stuck-open PCV valve
Low severity
A PCV valve stuck open admits excess unmetered air into the intake tract, particularly at idle.
Common cause
Parts:PCV valve
7
Exhaust leak upstream of the O2/A-F sensor
Low severity
A leak ahead of the sensor draws in outside air and biases the reading toward lean.
Common cause
8
Intake manifold gasket leak
Medium severity
A degraded intake manifold gasket is a common unmetered-air source on this platform's 4-cylinder engine.
Common cause
Parts:intake manifold gasket

Part links go to Amazon search results for this vehicle. As an Amazon Associate, WrenchConnect earns from qualifying purchases — always confirm fitment for your exact trim and engine before ordering.

These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0171 on your car still needs shop confirmation before any repair.

Common symptoms

Check engine light
Rough idle
Hesitation
Surging idle
Poor fuel economy

What to check before replacing parts

Review short- and long-term fuel trims on bank 1

Look for: High positive trims (commonly worse at idle, improving with RPM) mean the computer is adding fuel to compensate for excess air or insufficient fuel — that pattern is this code's fingerprint.

Smoke-test the intake

Look for: Smoke escaping (or a hiss you can hear) at intake boots, gaskets, or vacuum hose connections confirms unmetered air is entering after the MAF sensor, which is the most common cause of a lean code.

Inspect the PCV hoses and valve

Look for: A cracked, split, or disconnected PCV hose, or a PCV valve stuck open, draws in extra unmetered air the same way a vacuum leak does.

Clean and test the MAF sensor

Look for: Visible dirt or oil film on the sensor element, or a grams/second reading that doesn't track expected airflow for RPM, means the MAF is under-reporting air and causing the computer to under-fuel.

Verify fuel pressure

Look for: Pressure below spec (weak pump, clogged filter, failing regulator) starves the engine of fuel and produces the same lean trim pattern as a vacuum leak — rule it out before chasing leaks.

Rather have a pro handle it? Find a vetted local mechanic.

Matching symptoms

Car Runs Rough