Proper Care Of Oxygen Sensor Connections (GROUP 2, NO. 9902)

PROPER CARE OF OXYGEN SENSOR CONNECTIONS

TECHNICAL SERVICE BULLETIN

OXYGEN SENSOR CONNECTIONS

Model(s): 1997-on Porsche Boxster, Boxster S

Group: 2 - Exhaust

Bulletin No.: 9902

Part Identifier: 2469

Date: October 22, 1999

CONCERN

Proper care of oxygen sensor connections.

INFORMATION

Oxygen sensors perform their function by creating a signal voltage that is based on the comparison of air content in the exhaust system to that of a known good air reference (ambient oxygen). Since 1989, the oxygen sensors on Porsche cars have been said to be "submersible". This means that the sampling of reference oxygen is taken from the oxygen sensor connector in the engine compartment, as opposed to the oxygen sensor housing area (in prior configurations). Taking reference air from the connector results in more accurate sensor readings, because the oxygen sensor connector is less likely to be affected by moisture or foreign substances.

Although "submersible" oxygen sensors are basically impervious to substances at the sensor, they can be permanently damaged if any foreign substance is sprayed or otherwise applied to the oxygen sensor connector (or signal wire). To function properly, reference air must be allowed to pass through the connector, down the signal wire (within the insulation), and to the sensor.

Therefore, it is extremely important that the oxygen sensor connectors be clean and dry at all times. Contact cleaners, contact enhancers (such as Stabilant 22A), oil or water based sprays, and even die-electric compounds must be kept away from the oxygen sensor connections, or permanent sensor damage will result!

Always clean oxygen sensor contacts in a dry fashion, being careful not to allow any type of substance or debris into the connectors.

IMPORTANT: Oxygen sensors damaged by the application of any foreign substance in the connector area will not be considered a warranty matter.

Please inform all service personnel immediately.