Checking knock sensor wiring

• Disconnect electrical 3-pin harness connector -3- for Knock Sensor (KS) 1 -G61-.
Fig 1: Locating 3-Pin Harness Connector -3- For Knock Sensor (KS) 1 -G61-
Courtesy of AUDI OF AMERICA, INC.

• Disconnect electrical 3 -pin harness connector -3- for Knock Sensor (KS) 2 -G66-.
  Fig 2: Locating 3-Pin Harness Connector -3- For Knock Sensor (KS) 2 -G66-

  Courtesy of AUDI OF AMERICA, INC.
• Check all three terminals at knock sensor connector for short circuit to each other (terminal 1+2, 1+3, 2+3).
  • Specified value: INFINITY Ω (no continuity) - the wires must not have any connection to each other.
  Fig 3: Identifying Knock Sensor Connector Terminals

  Courtesy of AUDI OF AMERICA, INC.
• If there is a connection, replace knock sensor.

If no malfunction can be found: