Bosch Oxygen Sensor P/N:16978

Keep the engine's air-fuel control accurate with the Bosch Oxygen Sensor 16978. This sensor drops in across a broad range of Audi and Volkswagen models — including the 1998-2004 Volkswagen Beetle, 1999-2006 Volkswagen Golf, 2000-2006 Audi A4, 2000-2006 Audi TT, and 2004-2007 Volkswagen Touareg — giving the powertrain control module the exhaust feedback it relies on to trim the mixture.

• Mechanical job: Measures the oxygen content in the exhaust stream and sends a corresponding voltage signal to the PCM, which uses it to adjust the air-fuel ratio.
• Position coverage: Cataloged for upstream and downstream locations (including downstream-left and downstream-right) depending on the specific application — match the sensor to the position your vehicle calls for.
• Signs it may need replacing: A lit check-engine light, poor fuel economy, or a rough-running condition can point to a worn sensor; if a failed oxygen sensor is the cause, this replaces it.

Diagnose the underlying cause before replacing, as these symptoms can have other sources. Manufacturer part number 16978.

Fitment: 1998-2004 Volkswagen Beetle · 1999-2006 Volkswagen Golf · 1999-2005 Volkswagen Jetta · 2000-2006 Audi A4 · 2000-2005 Audi A4 Quattro · 2000-2006 Audi TT · 2000-2001 Audi TT Quattro · 2000-2002 Volkswagen Cabrio · 2000-2005 Volkswagen Passat · 2001-2003 Volkswagen Eurovan · 2002-2004 Audi A6 · 2002-2004 Audi A6 Quattro · 2002-2005 Audi Allroad Quattro · 2004-2006 Audi A8 Quattro · 2004-2009 Audi S4 · 2004-2006 Volkswagen Phaeton · 2004-2007 Volkswagen Touareg. See the Buyer's Guide tab to confirm the correct sensor and position for your vehicle.