Infiniti Engine Error Code P0171: How to Fix It

Q: Can I drive my Infiniti with P0171 code?

You can drive short distances, but avoid extended driving as the lean condition can damage your engine over time. The engine may experience poor performance, rough idling, and reduced fuel economy until the issue is resolved.

Q: How much does it cost to fix P0171 on an Infiniti?

Costs vary widely depending on the root cause. Simple fixes like cleaning the MAF sensor or replacing the air filter cost $20-50 DIY, while professional diagnosis and repair can range from $150-800 depending on whether you need a new MAF sensor, fuel pump, or vacuum hose repairs.

Q: What causes P0171 code in Infiniti vehicles?

The most common causes are a dirty or faulty MAF sensor, clogged air filter, vacuum leaks in intake hoses, failing fuel pump, clogged fuel filter, or carbon buildup in the intake system. Age-related wear of rubber vacuum lines is particularly common in older Infiniti models.

Q: Will P0171 cause my Infiniti to fail emissions testing?

Yes, P0171 will typically cause your vehicle to fail emissions testing since it indicates an improper air-fuel mixture. You must diagnose and repair the underlying issue before retesting for emissions compliance.

Q: How often should I clean my Infiniti's MAF sensor?

Clean the MAF sensor every 30,000-50,000 miles or when you notice symptoms like rough idling or poor acceleration. If you drive in dusty conditions or haven't changed your air filter recently, more frequent cleaning may be needed.

Abstract

The P0171 error code in your Infiniti indicates that the engine's fuel mixture is too lean on Bank 1, meaning there's too much air and not enough fuel. This commonly occurs due to a faulty Mass Airflow (MAF) sensor, vacuum leaks, or fuel delivery issues that need immediate attention to prevent engine damage.