Vacuum leak in the intake manifold or a disconnected vacuum hose; Contaminated or failing mass air flow (MAF) sensor; Faulty or clogged manifold absolute pressure (MAP) sensor; Restricted air intake or dirty air filter element; Wiring damage or poor connection at the MAP or MAF sensor; Leaking or stuck open positive crankcase ventilation (PCV) valve; Engine mechanical issues such as low compression or valve timing problems

DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P006A

P006AMAP - Mass or Volume Air Flow Correlation Bank 1

Q: What does code P006A mean?

MAP - Mass or Volume Air Flow Correlation Bank 1. P006A indicates that the powertrain control module (PCM) has detected a mismatch between the manifold absolute pressure (MAP) sensor signal and the mass air flow (MAF) or volume air flow sensor reading on bank 1. The computer expects these two independent load measurements to track each other closely under all operating conditions, and it sets this code when the correlation falls outside calibrated limits.

P006A indicates that the powertrain control module (PCM) has detected a mismatch between the manifold absolute pressure (MAP) sensor signal and the mass air flow (MAF) or volume air flow sensor reading on bank 1. The computer expects these two independent load measurements to track each other closely under all operating conditions, and it sets this code when the correlation falls outside calibrated limits.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or unstable engine speed at a stop
Hesitation or stumble during acceleration
Reduced fuel economy compared with normal driving
Occasional surging or poor throttle response
In some cases, a limp-home mode with limited power

Common causes, most likely first

Vacuum leak in the intake manifold or a disconnected vacuum hose
Contaminated or failing mass air flow (MAF) sensor
Faulty or clogged manifold absolute pressure (MAP) sensor
Restricted air intake or dirty air filter element
Wiring damage or poor connection at the MAP or MAF sensor
Leaking or stuck open positive crankcase ventilation (PCV) valve
Engine mechanical issues such as low compression or valve timing problems

How to diagnose and fix it

Inspect the air intake tract for leaks, loose clamps, or a dirty air filter and repair as needed
Check all vacuum hoses and the PCV system for cracks, disconnections, or leaks
Use a scan tool to compare live MAP and MAF readings against expected values at idle and under load
Clean the MAF sensor with a dedicated cleaner and verify the MAP sensor is free of carbon or oil contamination
Perform a smoke test to locate any hidden intake leaks
Inspect the wiring and connectors at both sensors for corrosion, chafing, or loose pins
If readings remain inconsistent, replace the faulty sensor only after confirming the other sensor and wiring are good

What a MAP-MAF mismatch really tells you

A dirty MAF sensor often reports lower airflow than actual, causing the PCM to see a mismatch with the MAP sensor even though the MAP sensor is perfectly good.
Small vacuum leaks that are too minor to cause a lean code can still trigger P006A because the correlation test is very sensitive at idle.
The code can be set by a lazy MAP sensor that responds slowly to pressure changes, which is easy to miss if you only check static readings.
Aftermarket air filters that are over-oiled can contaminate the MAF sensor and create this fault without any other driveability complaint.
A restricted exhaust or incorrect valve timing can alter the relationship between manifold pressure and airflow, setting P006A even when both sensors are accurate.

Can I keep driving with P006A?

You can usually continue driving to a repair shop, but avoid heavy acceleration and prolonged idling because the engine may run poorly or enter limp mode. If the check engine light begins flashing or the engine stalls, stop driving and seek immediate service.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.