P1140 — Mass Or Volume Air Flow Circuit Range Performance Problem

What Does P1140 Mean?

P1140 is a manufacturer-specific diagnostic trouble code: Mass Or Volume Air Flow Circuit Range Performance Problem. This code applies to BMW, NISSAN, BUICK, CADILLAC, CHEVY vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1140

⚠️ Check Engine Light (MIL) illuminated
⚠️ Mass Or Volume Air Flow not operating within expected parameters
⚠️ Reduced efficiency or performance of related system
⚠️ Reduced engine performance

Common Causes

🔍 Mass Or Volume Air Flow degraded or contaminated
🔍 Mechanical wear or binding in Mass Or Volume Air Flow
🔍 Incorrect Mass Or Volume Air Flow installed (wrong part number)
🔍 Related system mechanical issue affecting Mass Or Volume Air Flow readings

Frequently Asked Questions

What does P1140 mean?

P1140 indicates: Mass Or Volume Air Flow Circuit Range Performance Problem. The vehicle's computer has detected that the Mass Or Volume Air Flow is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1140?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1140 for extended periods may cause additional problems.

How much does it cost to fix P1140?

Repair costs for P1140 typically range from $50 to $250, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and clean Mass Or Volume Air Flow
🔧 Replace degraded Mass Or Volume Air Flow
🔧 Check for related mechanical issues affecting readings

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1140: Mass Or Volume Air Flow Circuit Range Performance Problem