BMW Error Code P1118: How to Fix It

Q: Can I drive my BMW with error code P1118?

You can drive short distances, but the vehicle may experience reduced performance, poor fuel economy, and rough idling. It's recommended to fix this issue promptly to prevent potential engine damage.

Q: How much does it cost to fix BMW P1118 error code?

DIY repair costs range from $15-20 for MAF cleaner to $150-400 for a replacement MAF sensor. Professional repair typically costs $300-600 including parts and labor.

Q: What causes BMW MAF sensor to fail?

Common causes include dirt accumulation on the sensor element, oil contamination from a dirty air filter, electrical connection issues, or normal wear over time (typically 80,000-120,000 miles).

Q: How often should I clean my BMW MAF sensor?

Clean the MAF sensor every 30,000-40,000 miles or when replacing the air filter. More frequent cleaning may be needed in dusty driving conditions.

Q: Will a dirty air filter cause P1118 code?

Yes, a severely dirty or oil-contaminated air filter can cause irregular airflow patterns that may trigger the P1118 code. Always check and replace the air filter when diagnosing MAF sensor issues.

Abstract

BMW error code P1118 indicates that your Mass Air Flow (MAF) sensor is sending a low input signal to the engine control unit. This means the sensor isn't properly measuring the amount of air entering the engine, which can cause rough idling, poor acceleration, and reduced fuel economy.