Thread: 91 300E, 02 sensor code, repl. 02 sensor, ECU, still get code
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Old 07-29-2004, 10:36 PM
stevebfl stevebfl is offline
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Fault codes are set for specific reasons. A fault code for an O2 sensor is usually set for its inability to light off within a certain time or for switching too slow, dwelling rich or lean for too long. Can you test this?

If you understand what is faulted, testing simply identifies the fault. For those reading codes and replacing parts. Hope you have deep pockets. One of the greatest goofs in the auto tech world is the free AZ code reading. Talk about useless information. A fault code without enabling criteria or the ability to test such is a parts store's dream.
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