P0328: Knock Sensor 1 Circuit High Input (Bank 1)
Severity: medium
What it means: The engine computer sees a signal from the bank 1 knock sensor that is higher than expected. That can be a sensor or wiring fault, or real mechanical noise.
Safe to drive? Usually drivable short term, but get it checked. On some engines it shows up alongside timing chain problems.
Common symptoms
- Check-engine light
- Reduced power
- Engine noise or rattle in some cases
Likely causes, ranked
- Faulty knock sensorShop
- Wiring or connector problemDIY
- Real mechanical noise, such as a loose timing chainShop
Vehicle-specific notes
- 2008–2012 Volkswagen Jetta: 2.0T: VW Vortex owners describe the early timing chain tensioner failing, letting the chain jump. Read the full answer · Source
- 2009–2012 Volkswagen CC: Same 2.0T timing chain tensioner issue. Read the full answer · Source
- 2009–2012 Volkswagen Tiguan: Same 2.0T timing chain tensioner issue. Read the full answer · Source
- 2010–2012 Volkswagen GTI: Same 2.0T timing chain tensioner issue. Read the full answer · Source
What it means: The engine computer sees a signal from the bank 1 knock sensor that is higher than expected. That can be a sensor or wiring fault, or real mechanical noise.
Severity: Medium. Safe to drive? Usually drivable short term, but get it checked. On some engines it shows up alongside timing chain problems.
DIY or shop?
Wiring checks are DIY. Sensor replacement varies by engine. Mechanical problems need a shop.
Before you replace parts
- Check the knock sensor connector and wiring.
- Listen for rattles, especially at cold start.
- Read all stored codes; cam/crank codes alongside it point to timing problems.
- On VW 2.0T engines, ask a shop to inspect the timing chain tensioner.
Safety / mechanic note
Verify with a mechanic. A rattle at cold start on a VW 2.0T can mean the chain is about to jump. A code points to a circuit or system, not always a specific part.