DTC/P0327

P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

Quick Answer

Moderata GravitàSicuro da guidare (a breve termine)Impianto elettrico

P0327 means the ECU detected a voltage signal from knock sensor 1 (or the single knock sensor on inline-4 engines) that is below the expected range. The knock sensor is a piezo-electric device bolted to the engine block that listens for the high-frequency vibration of detonation. A low input typically points to a failed sensor, damaged wiring, or a poor electrical connection.

Costo di riparazione stimatoDa €60 a €700+, varia in base al veicolo

Cosa significa P0327?

P0327 è un codice diagnostico di guasto relativo a impianto elettrico, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0327 e accende la spia motore.

Quali sono i sintomi di P0327?

Se il tuo veicolo ha attivato P0327, potresti notare uno o più di questi sintomi:

Check engine light illuminated
Reduced engine power, especially under acceleration
Pinging or knocking sound under load
Reduced fuel economy
Possible engine hesitation

Cosa causa P0327?

Ecco le cause più comuni di P0327, ordinate in base alla probabilità che siano la causa del problema:

altaFaulty knock sensor (failed piezo element)

mediaDamaged wiring or chafed harness to the sensor

mediaHeat-cycle fatigue on aging sensor (typical at 120,000+ km)

mediaLoose or corroded sensor connector

bassaIncorrect torque on intake or knock sensor bolts after recent service

È sicuro guidare con P0327?

In genere sì, per brevi tragitti. You can drive short distances, but the ECU will retard ignition timing as a precaution, reducing power and fuel economy. Sustained driving under load (heavy acceleration, towing, or highway hills) can cause untracked detonation that damages pistons over time. Repair within a few weeks.

Come si diagnostica P0327?

Segui questi passaggi per individuare la causa principale di P0327:

Locate knock sensor 1. On inline-4 engines it is bolted to the engine block, typically on the intake side. On V6 and V8 engines, knock sensors often sit in the valley under the intake manifold, which makes access expensive
Inspect the connector for corrosion or damage. Disconnect, clean with electrical contact cleaner, and reseat. Clear the code and drive several cycles to see if it returns
Measure sensor resistance with a multimeter. Most knock sensors read 4 to 5 megohms at room temperature. A reading near zero or infinity indicates a failed sensor
Inspect the wiring from the sensor back to the ECU connector. Look for chafing, rodent damage, or breaks. The wire is a shielded twisted pair on most modern designs
If the sensor and wiring are good, verify mounting torque. Knock sensors are torque-sensitive (typically 20 to 25 Nm). Loose or over-tight mounting alters the sensor signal and can trigger P0327

Quanto costa riparare P0327?

I costi di riparazione di P0327 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
Repair connector or wiring at knock sensor	€10–€40	€50–€150	€60–€190	Moderata
Replace knock sensor (inline-4, accessible)	€40–€150	€50–€100	€90–€250	Moderata
Replace knock sensor under intake manifold (V6/V8)	€40–€200	€200–€500	€240–€700	Professionale

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

P0327 su veicoli specifici

P0327 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:

BMW

P0327 su BMW 3 Series

2005–2024

BMW N52 inline-6 engines are known for knock sensor failures around 120,000 km, typically affecting both sensors as they age together. The sensors are accessible from the side of the engine block but the intake manifold removal makes access cleaner. Always replace both knock sensors together on the N52. The N54/N55 has similar high-mileage failures.

Cosa causa P0327 su una BMW 3 Series?

BMW 3 SeriesN52 knock sensor heat-cycle failure at 120,000+ km

BMW 3 SeriesAged wiring and connector corrosion on E90

Costo di riparazione di P0327 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
Repair connector or wiring at knock sensor	€14–€56	€70–€210	€84–€266	Moderata
Replace knock sensor (inline-4, accessible)	€56–€210	€70–€140	€126–€350	Moderata
Replace knock sensor under intake manifold (V6/V8)	€56–€280	€280–€700	€336–€980	Professionale

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

Volkswagen

P0327 su Volkswagen Golf

2005–2024

The Mk5 and Mk6 Golf with TSI/TFSI EA888 engines have a known knock sensor wiring chafe issue. The harness routes near the cylinder head and can rub against engine components, causing intermittent and eventually permanent low-signal faults. Check the wiring carefully before replacing the sensor. Replacement sensors from Autodoc.de are 30 to 60 EUR aftermarket.

Cosa causa P0327 su una Volkswagen Golf?

Volkswagen GolfEA888 wiring chafe causing intermittent low signal

Volkswagen GolfFailed knock sensor at high mileage on Mk5/Mk6 TSI

Costo di riparazione di P0327 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
Repair connector or wiring at knock sensor	€12–€46	€57–€173	€69–€218	Moderata
Replace knock sensor (inline-4, accessible)	€46–€173	€57–€115	€103–€288	Moderata
Replace knock sensor under intake manifold (V6/V8)	€46–€230	€230–€575	€276–€805	Professionale

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

Audi

P0327 su Audi A4

2005–2024

The B8 A4 with the 2.0 TFSI EA888 has knock sensors mounted under the intake manifold, similar to V6 designs. Access requires intake manifold removal, adding 2 to 3 hours of labour. P0327 is often a wiring chafe rather than the sensor itself, so always inspect the harness first.

Cosa causa P0327 su una Audi A4?

Audi A4B8 2.0 TFSI knock sensor under intake (expensive labour)

Audi A4Wiring chafe near cylinder head

Costo di riparazione di P0327 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
Repair connector or wiring at knock sensor	€13–€50	€63–€188	€75–€238	Moderata
Replace knock sensor (inline-4, accessible)	€50–€188	€63–€125	€113–€313	Moderata
Replace knock sensor under intake manifold (V6/V8)	€50–€250	€250–€625	€300–€875	Professionale

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

Toyota

P0327 su Toyota Camry

2007–2024

The 2GR-FE V6 (2007 to 2017 Camry) has knock sensors mounted in the valley between the cylinder banks at the rear of the engine. The intake manifold must be removed for access, and the typical labour is 3 to 5 hours at 50 to 80 EUR per hour in the EU. Always replace both knock sensors together on the 2GR-FE. The 2AR-FE inline-4 (2010+ 4-cylinder Camry) has the sensor on the side of the block and is far cheaper to service.

Cosa causa P0327 su una Toyota Camry?

Toyota Camry2GR-FE V6 knock sensors at rear of engine under intake (expensive)

Toyota Camry2AR-FE inline-4 sensor wiring fatigue (cheaper repair)

Questi codici compaiono spesso insieme a P0327 o indicano problemi correlati:

P0325P0326P0328P0330P0332

Domande frequenti su P0327

Can I drive with a knock sensor code?

Short distances yes, but not long-term. The ECU pulls ignition timing as a safety measure when it cannot trust the knock sensor signal, costing you 5 to 15 percent fuel economy and noticeable power. More importantly, the ECU has no way to detect actual detonation. Sustained heavy load can damage pistons over weeks or months.

Why is the knock sensor so expensive to replace on a V6 or V8?

On most V6 and V8 engines, knock sensors are mounted in the valley between the cylinder banks, under the intake manifold. The intake must come off to access them. On engines like the Toyota 2GR-FE V6, this is a 3 to 5 hour job with labour around 250 to 400 EUR even though the sensor itself is only 40 to 80 EUR. The sensors are typically replaced as a pair while the intake is off.

What is the difference between P0327 and P0328?

Both refer to knock sensor 1 (or the single sensor). P0327 is low input (signal voltage too low) while P0328 is high input (signal voltage too high). Both typically indicate sensor failure or wiring issues, but P0327 is more often a failed sensor and P0328 is more often a shorted wire.

Can a recent intake manifold service cause P0327?

Yes. If the intake manifold was removed for cleaning, gasket replacement, or fuel injector service, the knock sensor bolts may not have been torqued to the correct spec (typically 20 to 25 Nm). Loose or over-tight mounting changes the sensor's resonance and the ECU can flag it as an out-of-range signal. Ask the shop to recheck torque before replacing the sensor.

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