Here is great article by Gary Goms on how to diagnosis oxygen sensors and converters.
It is full of BRAKE & FRONT END goodness. Enjoy!!!
Diagnosing Three-Way Converters
By Gary Goms
The essence of remaining competitive in the Undercar service industry is to work at the leading edge of modern vehicle technology. Just a few years ago, for example, most of us replaced a catalytic converter only when it disintegrated or when it wouldn't pass a local emissions test. Today, we're finding ourselves replacing converters when a customer brings in his vehicle with an illuminated malfunction indicator light (MIL) and a set of diagnostic trouble codes that may indicate when the efficiency of catalytic converter has fallen below federal and state standards.
To meet pre-1996 emissions standards, "two-way" catalytic converters were designed to convert two regulated gases, hydrocarbons (HC) and carbon monoxide (CO) into carbon dioxide (CO2) and water (H2O). To accomplish this, two-way converters require a slightly richer air/fuel ratio to help...
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