Air leak after the MAF sensor, such as a split intake hose, loose clip or leaking intake manifold gasket; Contaminated or faulty MAF sensor giving an inaccurate airflow reading; Faulty MAP sensor or a blocked or leaking MAP sensor vacuum or pressure supply; Damaged wiring, poor connections or corrosion at the MAF or MAP sensor connectors; Restricted air filter or intake duct, or a restricted exhaust affecting manifold pressure; On turbocharged engines, a boost leak or a fault in the boost control affecting manifold pressure; Fault in the engine control unit or an outdated calibration, where a manufacturer notice confirms it.

P006A

MAP - Mass or Volume Air Flow Correlation Bank 1.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
6A: FaultThe specific fault in that area

What it means

P006A is the generic code for a correlation fault between the Manifold Absolute Pressure (MAP) sensor and the Mass or Volume Air Flow (MAF) sensor on bank 1. The engine control unit compares the manifold pressure with the airflow reading and expects them to agree for the current engine speed and load. When the two readings disagree by more than the allowed amount for long enough, the code is set.

Symptoms

Engine warning light on
Poor or hesitant acceleration
Rough or unstable idle
Poor fuel economy
Engine running in a reduced power (limp) mode
Possible hesitation or stumbling under load

Possible causes

Air leak after the MAF sensor, such as a split intake hose, loose clip or leaking intake manifold gasketlikely
Contaminated or faulty MAF sensor giving an inaccurate airflow readinglikely
Faulty MAP sensor or a blocked or leaking MAP sensor vacuum or pressure supplylikely
Damaged wiring, poor connections or corrosion at the MAF or MAP sensor connectorspossible
Restricted air filter or intake duct, or a restricted exhaust affecting manifold pressurepossible
On turbocharged engines, a boost leak or a fault in the boost control affecting manifold pressurepossible
Fault in the engine control unit or an outdated calibration, where a manufacturer notice confirms itrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting engine speed, load, and airflow and manifold pressure values when the fault set.
Visually inspect the air filter, intake ducting, clips, breather hoses and vacuum hoses for splits, loose fittings or disconnections.
Inspect the MAF and MAP sensor wiring and connectors for damage, corrosion, bent pins and poor contact.
With the engine at idle with ignition on and engine off, compare live MAP reading with barometric pressure; it should be close to ambient.
Compare live MAF and MAP data at idle and under steady load, and check they are plausible for the engine size; the correct values depend on the model and engine.
Check for intake leaks after the MAF sensor, for example with a smoke test, and on turbo engines check the charge air system for leaks.
Check the MAP sensor supply voltage, ground and signal against the manufacturer's data, and check any vacuum or pressure line to the sensor is clear.
Check for related fuel trim, misfire or boost codes and look for a restricted exhaust if readings suggest high back pressure.

How to fix

Repair or replace any split, loose or disconnected intake hose, clip or leaking manifold gasket.
Clean the MAF sensor only with a cleaner made for the purpose, or replace it if the readings remain wrong.
Replace the MAP sensor or clear and repair its pressure or vacuum supply line if it is faulty or blocked.
Repair damaged wiring or connectors, and clean or replace corroded terminals.
Replace a blocked air filter or restricted intake duct, and rectify any exhaust restriction found.
Where the manufacturer confirms an outdated calibration as a cause for that model, have the control unit updated.

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but the fault should be fixed soon as poor running, higher fuel use and limp mode may follow. If it goes into reduced power or runs badly, limit driving and have it checked promptly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.