P0101 on a Hyundai: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

You can usually keep driving a Hyundai with P0101, but a bad MAF reading can cause rough running and worse fuel economy until it's fixed.

What P0101 means on a Hyundai

On a Hyundai, P0101 means the mass air flow sensor is reporting an airflow reading outside the expected range. Hyundai's computer uses the MAF reading to balance the fuel mixture, and a bad reading can cause rough running, hesitation, and worse fuel economy.

Is P0101 common on Hyundais?

P0101 shows up on Hyundai models like the Elantra, Sonata, and Tucson. A dirty MAF element, a clogged air filter, or an intake leak are typical triggers, and the sensor can fail with age.

Commonly reported on: Elantra, Sonata, Tucson, Santa Fe.

Symptoms

Check engine light on
Rough idle
Hesitation when accelerating
Worse fuel economy

Common causes

most common: Dirty MAF sensor
common: Clogged air filter
common: Intake or vacuum leak
less common: Faulty MAF sensor
less common: Damaged wiring or connector

How to fix it

Fix	DIY?	Typical cost
Clean the MAF sensor with sensor-safe cleaner	Yes	$10–20
Replace the air filter if it is dirty	Yes	$15–40
Replace the MAF sensor if cleaning doesn't help	Yes	$120–350
Inspect the intake duct for leaks	Yes	$0–50