P0103

Mass or Volume Air Flow Sensor A Circuit High

Fuel & air metering Generic OBD-II High

What it means

P0103 means the mass airflow (MAF) sensor's "A" circuit is reporting a signal that's higher than the expected range. The MAF tells the ECM how much air is entering the engine so it can meter fuel correctly, so a false-high reading throws off the air/fuel mix — leading to hesitation, poor economy, and sometimes stalling. It's most often a dirty sensor or a wiring fault rather than a failed ECM.

High

Can I keep driving? Usually drivable, but the engine may hesitate, stall, or lose power — get it fixed soon, especially if it stalls or runs very roughly.

Real-world scan data

Seen in

4,138

scans in the past year

Found in

0.7%

of scans

1.2%

of scans that found faults

Appears alongside · share of P0103 scans

P0113in 49.1% of scans

P0101in 37.8% of scans

P0102in 7.8% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Hesitation, surging, or rough running
Reduced power and poor acceleration
Poor fuel economy
Occasional stalling, especially at idle

Common causes

Most likely first

Dirty or contaminated mass airflow (MAF) sensorLikely
MAF signal wiring shorted to voltage or openCommon
Vacuum or intake leak drawing unmetered airCommon
Corroded or loose MAF connectorLess often
Failed ECM/PCM (rare)Less often

How to diagnose & fix

Work through it in order

Inspect the intake ducting between the MAF and throttle body for cracks, loose clamps, or leaks.
Check the MAF connector and wiring for damage, corrosion, or a short to power.
Compare the MAF's live airflow reading to expected values for engine size and RPM.
Clean the MAF element with MAF-safe cleaner; replace the sensor if it still reads high.
If wiring and sensor are good, check for unmetered air/vacuum leaks. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0103?+

Short-term usually, but a bad MAF signal can cause hesitation and stalling. Avoid long trips until it's fixed, and be cautious if the engine stumbles in traffic.

Can I just clear P0103?+

It returns within a drive cycle or two while the MAF keeps reporting a high signal. Clean or replace the sensor (or fix the wiring/leak) first.

Read & clear P0103 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX