What Does P00BE Mean?
The mass or volume air flow sensor on circuit 'B' (typically bank 2 on V-engines or a secondary MAF sensor) is reporting airflow values that are consistently lower than expected by the PCM. This code is specific to the 'B' circuit and indicates the secondary MAF is under-reading airflow, causing lean fuel delivery to the affected bank. The driver may notice reduced power, hesitation, or a lean misfire on one bank.
Common Causes
35%
Dirty or contaminated MAF 'B' sensor element
25%
Air leak in the bank 2 intake tract between the MAF sensor and intake manifold
15%
Restricted air filter on bank 2 intake
15%
Failing MAF 'B' sensor with degraded element
10%
Wiring or connector issue specific to the MAF 'B' circuit
Diagnostic Steps
1
Compare MAF 'A' and MAF 'B' PIDs at idle and at 2500 RPM — both should read similar values on a symmetric V-engine; a significantly lower 'B' reading indicates a problem on that side.
2
Clean the MAF 'B' sensor element with dedicated MAF cleaner — contamination from oil vapor or aftermarket air filter oil is a common cause.
3
Perform a smoke test on the bank 2 intake tract from the MAF sensor to the intake manifold to detect any unmetered air leaks.
4
Inspect the bank 2 air filter (if separate from bank 1) for excessive contamination or improper installation.
5
Check the MAF 'B' sensor connector and wiring for corrosion, loose pins, or damage — measure the 5V reference and ground at the sensor connector.
Estimated Repair Cost
$30 - $400
Parts + labor, varies by vehicle and location
The mass or volume air flow sensor on circuit 'B' (typically bank 2 on V-engines or a secondary MAF sensor) is reporting airflow values that are consistently lower than expected by the PCM. This code is specific to the 'B' circuit and indicates the secondary MAF is under-reading airflow, causing lea...
The most common cause of P00BE (Mass or Volume Air Flow "B" Circuit Range/Performance - Air Flow Too Low) is: Dirty or contaminated MAF 'B' sensor element
Typical repair costs for P00BE range from $30 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive short distances. The PCM will attempt to compensate with fuel trims but the affected bank may run lean. Prolonged lean operation can overheat the bank 2 catalytic converter. Diagnose promptly to avoid secondary damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P00BE to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Fuel / Air Metering System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
