The Quick Answer above is the generic definition. What follows is the model-specific detail for the Audi models that log P0328.
DTC/P0328·Audi
P0328 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Audi
P0328 on a Audi means the ECU is detecting a voltage on the knock sensor 1 signal that is higher than the expected range. This typically happens when the signal wire is shorted to a 12 V source, the sensor has failed internally, or the wiring is open in a way that leaves the input floating. Without a trusted knock signal the ECU adopts conservative timing, reducing performance and fuel economy.
Typical repair cost, all makes€90 - €900
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Audi A4
2008-2024B8 A4 with the 2.0 TFSI tends to log P0328 from harness chafing near the engine cover mounting bolt. The wire rubs through and intermittently shorts to a 12 V conductor, producing a clean high-input fault. Repair with a fresh sleeve and proper routing.
What causes P0328 on a Audi?
Beyond the generic causes listed on the main P0328 page, these are the patterns noted for Audi models:
Audi A4Knock sensor wire chafe near engine cover bolt on 2.0 TFSI
Audi A4Sensor failure after long-term heat soak
How to diagnose P0328 on a Audi with OBD2
Follow these steps to pinpoint the root cause of P0328:
- Read freeze-frame data and note RPM and load when the code was set. A code set only at high load can point to a wiring fault that opens under engine flex
- Locate the knock sensor (often under the intake manifold on V6/V8, or on the side of the block on inline engines). Inspect the connector for water, oil, and bent pins
- Measure resistance across the sensor terminals with the connector unplugged. 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 near-zero reading indicates a failed sensor
- Verify continuity of the signal wire from the sensor connector to the ECU pin. An open in the wire can present as a high-input fault on some ECUs
- If wiring and sensor are good, scope the signal during a controlled rev to confirm the sensor is producing a clean piezo voltage as the engine vibrates
How much does P0328 cost to fix on a Audi? (EUR)
Estimated repair costs for P0328 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 P0328
These codes are often seen alongside P0328 or point to related issues, on any make:
Looking for the full P0328 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0328 guideSkanyx · Audi
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