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The OBD2 self tests can take awhile to clear. All of these self tests go in a particular order as well. The cat is the last to clear. The cat self test has to be done with stop and go driving around town(alot of it). It has to reach a set temp to pass its self test. I had to clear all of the tests and start over for it to cycle correctly on my 98 F-150.

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13y ago
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Q: Inspection fail O2 and cat sensors not ready even after driving 01 Ford F-150?
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