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DTC/P0102

P0102: Mass or Volume Air Flow Circuit Low Input

Quick Answer
Moderata GravitàSicuro da guidare (a breve termine)Sistema di alimentazione

P0102 means the mass air flow sensor is reporting a voltage or frequency below the expected idle minimum. The ECU thinks almost no air is entering the engine, so it cuts fuel injection accordingly. The root cause is usually a contaminated MAF element, a major air leak after the sensor, or a wiring fault.

Costo di riparazione stimatoDa €8 a €350+, varia in base al veicolo

Cosa significa P0102?

P0102 means the mass air flow sensor is reporting a voltage or frequency below the expected idle minimum. The ECU thinks almost no air is entering the engine, so it cuts fuel injection accordingly. The root cause is usually a contaminated MAF element, a major air leak after the sensor, or a wiring fault.

P0102 è un codice diagnostico di guasto relativo a sistema di alimentazione, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0102 e accende la spia motore.

Quali sono i sintomi di P0102?

Se il tuo veicolo ha attivato P0102, potresti notare uno o più di questi sintomi:

  • Check engine light illuminated
  • Hesitation or stumble during acceleration
  • Stalling at idle, especially when warm
  • Poor fuel economy and loss of power
  • Long-term fuel trims pinned positive (lean correction)

Cosa causa P0102?

Ecco le cause più comuni di P0102, ordinate in base alla probabilità che siano la causa del problema:

altaHeavily contaminated MAF sensor element from dirty air filter or oiled performance filter
altaLarge air leak between MAF sensor and throttle body (split intake boot, loose clamp)
mediaDamaged or chafed MAF signal wire shorted to ground
mediaFailed MAF sensor (hot-wire or hot-film element burned out)
bassaBlocked or collapsed air intake duct restricting airflow upstream of MAF

È sicuro guidare con P0102?

In genere sì, per brevi tragitti. Driveable but the engine will run poorly. With abnormally low MAF readings, the ECU under-fuels the engine, causing lean conditions, hesitation, and possible stalling. Safe to drive to a shop, but long-term lean running can damage catalysts and valves.

Come si diagnostica P0102?

Segui questi passaggi per individuare la causa principale di P0102:

  1. Read live data and check MAF reading at idle. A 4-cylinder should show 2–7 g/s. Below 1 g/s is consistent with P0102
  2. Inspect the air filter and replace if dirty (a clogged filter pushes MAF readings low)
  3. Inspect the intake tract from the MAF housing to the throttle body or turbo for cracks, loose clamps, or disconnected hoses
  4. Clean the MAF sensor using a dedicated MAF cleaner spray (never use brake cleaner or carb cleaner)
  5. If readings remain low after cleaning and the intake is sealed, unplug the MAF and test drive. If the car runs better, replace the sensor

Quanto costa riparare P0102?

I costi di riparazione di P0102 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

Riparazione Costo dei ricambi Costo della manodopera Stima totale Difficoltà fai-da-te
Clean MAF sensor with MAF-specific cleaner €8–€20 €0–€60 €8–€80 Facile
Replace MAF sensor €40–€250 €30–€80 €70–€330 Facile
Repair intake boot or charge pipe air leak €20–€150 €60–€200 €80–€350 Moderata

Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.

P0102 su veicoli specifici

P0102 si comporta in modo diverso a seconda del tuo veicolo. Seleziona la tua auto qui sotto per cause specifiche del modello, problemi noti e stime dei costi adeguate:

Nissan

P0102 su Nissan Qashqai

2007-2024

Nissan's hot-film mass air flow (MAF) sensor is a known weak point (Qashqai, Juke, Note, Micra and the QR-engined Altima and X-Trail), so P0102, a low MAF signal, is very often the sensor itself or its connector rather than a wiring fault. An over-oiled aftermarket air filter is a common trigger, so fit an OEM Hitachi MAF.

Cosa causa P0102 su una Nissan Qashqai?

Nissan QashqaiFailing hot-film MAF sensor, a known Nissan weak point
Nissan QashqaiCorroded or loose MAF sensor connector giving a low signal
Nissan QashqaiOver-oiled aftermarket air filter contaminating the MAF element
BMW

P0102 su BMW 3 Series

2006–2024

BMW N52, N54, and N55 engines use Bosch hot-film MAF sensors that degrade reliably around 120,000 km. The MAF element becomes coated with crankcase oil mist from the PCV system, which lowers its readings. On the N54, P0102 often accompanies a cracked intake charge pipe under the manifold. INPA shows live MAF values in g/s for comparison against the workshop spec.

Cosa causa P0102 su una BMW 3 Series?

BMW 3 SeriesN52/N54/N55 hot-film MAF degradation at 120,000+ km from PCV oil mist
BMW 3 SeriesN54 cracked charge pipe creating boost leak after MAF

Costo di riparazione di P0102 per BMW 3 Series

Costi stimati per i proprietari di BMW 3 Seriesadeguato al rialzo rispetto alla media a causa dei prezzi dei ricambi specifici BMW

Riparazione Costo dei ricambi Costo della manodopera Stima totale Difficoltà fai-da-te
Clean MAF sensor with MAF-specific cleaner €11–€28 €0–€84 €11–€112 Facile
Replace MAF sensor €56–€350 €42–€112 €98–€462 Facile
Repair intake boot or charge pipe air leak €28–€210 €84–€280 €112–€490 Moderata

Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.

Volkswagen

P0102 su Volkswagen Golf

2008–2024

The Golf TFSI (EA888) commonly throws P0102 when the carbon buildup on intake valves restricts airflow enough to skew MAF readings low at idle. Walnut blast cleaning of the intake valves is the standard fix on the EA888. The intake charge pipe between the MAF and throttle body also cracks at the dogbone mount on high-mileage cars, creating air leaks after the sensor.

Cosa causa P0102 su una Volkswagen Golf?

Volkswagen GolfEA888 intake valve carbon buildup restricting airflow past MAF
Volkswagen GolfCharge pipe cracking at dogbone mount on high-mileage TSI

Costo di riparazione di P0102 per Volkswagen Golf

Costi stimati per i proprietari di Volkswagen Golfadeguato al rialzo rispetto alla media a causa dei prezzi dei ricambi specifici Volkswagen

Riparazione Costo dei ricambi Costo della manodopera Stima totale Difficoltà fai-da-te
Clean MAF sensor with MAF-specific cleaner €9–€23 €0–€69 €9–€92 Facile
Replace MAF sensor €46–€288 €35–€92 €81–€379 Facile
Repair intake boot or charge pipe air leak €23–€173 €69–€230 €92–€402 Moderata

Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.

Audi

P0102 su Audi A4

2008–2024

B8 A4 2.0 TFSI is notorious for MAF failures around 100,000 km. The Bosch hot-film element loses sensitivity from carbon and oil contamination. VCDS shows long-term fuel trims pinned above +20% before the code sets. Always inspect the PCV diaphragm at the same time, since a leaking PCV causes oil contamination that ruins replacement sensors quickly.

Cosa causa P0102 su una Audi A4?

Audi A4B8 2.0 TFSI MAF sensor failure at 100,000 km from oil contamination
Audi A4PCV diaphragm leak destroys replacement sensors quickly

Costo di riparazione di P0102 per Audi A4

Costi stimati per i proprietari di Audi A4adeguato al rialzo rispetto alla media a causa dei prezzi dei ricambi specifici Audi

Riparazione Costo dei ricambi Costo della manodopera Stima totale Difficoltà fai-da-te
Clean MAF sensor with MAF-specific cleaner €10–€25 €0–€75 €10–€100 Facile
Replace MAF sensor €50–€313 €38–€100 €88–€413 Facile
Repair intake boot or charge pipe air leak €25–€188 €75–€250 €100–€438 Moderata

Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.

Ford

P0102 su Ford Focus

2011–2024

The Focus 1.6 and 2.0 EcoBoost engines are sensitive to MAF contamination because of high blow-by rates from the turbo. Ford specifically recommends MAF cleaning every 30,000 km on EcoBoost engines as part of preventive maintenance. P0102 on EcoBoost frequently resolves with a single clean. Aftermarket air filters and missed services accelerate the problem.

Cosa causa P0102 su una Ford Focus?

Ford FocusEcoBoost MAF contamination from high blow-by, needs cleaning every 30,000 km
Ford FocusAftermarket oiled air filters accelerate contamination

Costo di riparazione di P0102 per Ford Focus

Costi stimati per i proprietari di Ford Focusadeguato al ribasso rispetto alla media a causa dei prezzi dei ricambi specifici Ford

Riparazione Costo dei ricambi Costo della manodopera Stima totale Difficoltà fai-da-te
Clean MAF sensor with MAF-specific cleaner €7–€18 €0–€54 €7–€72 Facile
Replace MAF sensor €36–€225 €27–€72 €63–€297 Facile
Repair intake boot or charge pipe air leak €18–€135 €54–€180 €72–€315 Moderata

Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.

Questi codici compaiono spesso insieme a P0102 o indicano problemi correlati:

P0100P0101P0103P0171P0174

Domande frequenti su P0102

Can I drive with P0102?

Yes, short distances. The engine runs lean and rough because the ECU under-fuels based on the low MAF signal. Long-term lean running damages catalytic converters and exhaust valves, so plan the repair within a week.

Will cleaning the MAF fix P0102?

Often yes. Around half of P0102 cases are resolved by a proper clean with MAF-specific cleaner. Never touch the sensing element with anything, and never use brake or carb cleaner since they leave residue that destroys the hot-wire.

Why does my car run worse after cleaning the MAF sensor?

Three common reasons. First, residue from the wrong cleaner contaminated the element. Second, the sensor was already failing and cleaning revealed the underlying fault. Third, the air filter or intake boot was not reseated correctly, creating a new air leak. Inspect all three before replacing the sensor.

How long does an MAF sensor last?

Typically 150,000–250,000 km on petrol engines if the air filter is changed regularly. Diesel MAF sensors tend to last longer (less contamination from PCV blow-by). BMW N52/N54/N55 and Audi 2.0 TFSI MAF sensors are well-known early failures, often before 120,000 km, especially with aftermarket oiled air filters.

Leggi le nostre guide dettagliate

How to Fix P0101: MAF Sensor Cleaning and Repair Cost

P0101 repair often costs under €15: cleaning the MAF sensor fixes about half of cases. If that fails, replacement runs €70 to €380. Step-by-step fix guide.

Reduced Engine Power: What It Means, Causes and Whether You Can Drive

The Reduced Engine Power message is the ECU cutting throttle to protect itself. Here is what triggers it, whether you can drive, and what the fix costs.

MAF Sensor Cleaning: Step-by-Step DIY Guide (2026)

Clean your MAF sensor in 15 minutes for under €10. Step-by-step guide with OBD2 verification to fix hesitation, rough idle, and poor fuel economy.

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