What Does P010B Mean?
The ECM has detected that the secondary Mass Air Flow (MAF) sensor "B" is reading outside its expected range during normal operating conditions. This sensor measures the volume of air entering the engine on the second air intake tract (common on V-engines or dual-intake systems). The driver may notice reduced power, rough idle, hesitation on acceleration, or increased fuel consumption due to incorrect air metering.
Common Causes
35%
Contaminated or fouled MAF "B" sensor element
25%
Air leak in intake ducting between MAF sensor B and throttle body
20%
Dirty or restrictive air filter on bank B intake
15%
Faulty MAF "B" sensor (internal circuit failure)
5%
Wiring harness damage or connector corrosion at MAF "B" sensor
Diagnostic Steps
1
Monitor live MAF "B" sensor data at idle — should read approximately 2-7 g/s; compare to MAF "A" readings for symmetry.
2
Inspect the air filter on bank B for excessive contamination, debris, or collapse, and check the air filter housing for cracks or misalignment.
3
Visually inspect the intake ducting from the MAF "B" sensor to the intake manifold for cracks, loose clamps, or disconnected vacuum lines. Use a smoke machine if available.
4
Remove the MAF "B" sensor and inspect the hot-wire or hot-film element for contamination. Clean with dedicated MAF sensor cleaner spray only — never touch the element.
5
With the engine at operating temperature, perform a snap throttle test and observe MAF "B" response — should ramp smoothly from idle to over 100 g/s and return without drop-outs or spikes.
Estimated Repair Cost
$50 - $350
Parts + labor, varies by vehicle and location
The ECM has detected that the secondary Mass Air Flow (MAF) sensor "B" is reading outside its expected range during normal operating conditions. This sensor measures the volume of air entering the engine on the second air intake tract (common on V-engines or dual-intake systems). The driver may noti...
The most common cause of P010B (Mass or Volume Air Flow "B" Circuit Range/Performance) is: Contaminated or fouled MAF "B" sensor element
Typical repair costs for P010B range from $50 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is generally safe to drive short distances, but performance and fuel economy will be degraded. Prolonged driving may cause catalyst damage or stalling under load. Avoid heavy towing or sustained high-speed driving until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P010B to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel / Air Metering
Difficulty
Type
Generic (SAE)
Recommended Tools
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