P006A: MAP - Mass or Volume Air Flow Correlation Bank 1

What it means

The expected relationship between manifold absolute pressure (MAP) and mass airflow (MAF) on bank 1 is violated. One of the two sensors is reading incorrectly.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The MAF sensor measures incoming air, and the MAP sensor measures intake manifold pressure; the control module uses both to check whether the air entering bank 1's engine intake is plausible. P006A sets when those readings do not match the expected relationship, which may point to a contaminated MAF, a leak, or a drifting MAP sensor.

Common causes

Most likely first.

1. MAF sensor contaminated
2. Intake/vacuum leak
3. MAP sensor reading drifted

Symptoms

• Check-engine light on
• Reduced engine power
• Poor acceleration
• Rough idle

How to diagnose it

1. Save freeze-frame data, then compare MAF and MAP live readings at idle and during a steady increase in engine speed.
2. Inspect the air ducting and intake hoses for splits, loose clamps, or leaks that could make the airflow readings disagree.
3. Check the MAF and MAP connectors and wiring for contamination, corrosion, loose pins, or damage.
4. Inspect the MAF sensing element for contamination and clean it only with a suitable MAF sensor cleaner if appropriate.
5. Check MAP sensor response and intake leaks, then test both sensor circuits against the manufacturer's specification.

Common fixes

• Repair a loose intake connection or leaking hose.
• Clean a contaminated MAF sensor with suitable cleaner, if the sensor is serviceable.
• Repair damaged MAF or MAP wiring or connectors.
• Replace a sensor only if its readings fail the manufacturer's checks.

Can I keep driving?

If the engine remains smooth and responsive, drive gently and avoid heavy acceleration until diagnosed. Stop if power drops sharply or the engine runs roughly, as the incorrect air estimate can worsen drivability and emissions.