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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There are 4 oxygen sensors on the 2001 ford f150 v6.
They are located on the exhaust right before the cats.
O2 sensors are always located on the exhaust system.O2 sensors are always located on the exhaust system.
I have a 99 f150 w/ the v6. You actually have 4 o2 sensors. 2 upstream of the cats and 2 down stream of the cats
There usually on the exhaust header
Catalytic converter efficiency failure.
there should be 4 two are pre cat and two are post cat
No spark .no fuel.