What it means
Restriction or leak detected in the intake plumbing between the air filter and the mass-air-flow sensor on bank 2 — typically a cracked intake boot or torn filter element.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
This code concerns airflow in the intake path between the air filter and the mass airflow sensor on bank 2. The control module detects a restriction or leak in that section, or a bank 2 airflow reading that is inconsistent with expected intake flow.
Common causes
Most likely first.
- Cracked or loose intake duct between the air filter and MAF sensor
- Damaged or poorly seated air filter
- Intake restriction or obstruction
- MAF sensor fault
Symptoms
- Check engine light on
- Power loss, hesitation under acceleration
- Rough or unstable idle
- Increased fuel consumption
- Possible difficulty starting
How to diagnose it
- Check freeze-frame data and bank 2 airflow readings during idle and acceleration to see when the restriction or mismatch is detected.
- Inspect the bank 2 air filter and its housing for a damaged, incorrectly seated, or obstructed filter element.
- Trace the duct from the bank 2 air filter to the MAF sensor and check for cracks, loose joints, collapsed sections, or objects blocking the passage.
- Compare bank 2 MAF data with other available airflow or bank readings under the same operating conditions.
- If the intake path is clear and sealed, test the bank 2 MAF sensor and its circuit against the manufacturer's specification.
Common fixes
- Refit or replace a damaged or incorrectly seated bank 2 air filter.
- Remove an obstruction from the intake duct.
- Tighten loose duct connections between the bank 2 filter and MAF sensor.
- Repair or replace a cracked or collapsed intake duct.
- Replace the bank 2 MAF sensor only if testing confirms it is faulty.
Can I keep driving?
A short drive may be reasonable if the engine runs smoothly, but avoid hard acceleration if it lacks power or hesitates. Continued airflow restriction can worsen drivability and fuel use.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.