Checking internal resistance

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Secondary Air Injection (AIR) Solenoid Valve -N112-

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect connector at Secondary Air Injection (AIR) solenoid valve N112 - 2 -.

Fig 2: Connecting Multimeter To Valve (Resistance Measurement Range)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect multimeter and measure resistance at valve.

Specification: 27 to 30 Ω

If reading does not match specification:

Replace Secondary Air Injection (AIR) solenoid valve N112.

If measured value matches specification:

Check power supply.