The Quick Answer above is the generic definition. What follows is the model-specific detail for the Audi models that log P0327.
DTC/P0327·Audi
P0327 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Audi
P0327 on a Audi 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.
Typical repair cost, all makes€60 - €700
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Audi A4
2005-2024The 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.
What causes P0327 on a Audi?
Beyond the generic causes listed on the main P0327 page, these are the patterns noted for Audi models:
Audi A4B8 2.0 TFSI knock sensor under intake (expensive labour)
Audi A4Wiring chafe near cylinder head
How to diagnose P0327 on a Audi with OBD2
Follow these steps to pinpoint the root cause of 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. Depending on design, knock sensors read anywhere from roughly 100 kΩ to several megohms, and some show no continuity at all, so compare with the figure for your engine rather than a generic number. A reading near zero indicates a shorted 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
How much does P0327 cost to fix on a Audi? (EUR)
Estimated repair costs for P0327 in EUR, compiled across makes. Expect Audi parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0327
These codes are often seen alongside P0327 or point to related issues, on any make:
Looking for the full P0327 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0327 guideSkanyx · Audi
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