I replaced my oxygen sensor
Okay, so now you know not to pull the PCM fuse. It won't reset the codes, the parts stores read and reset codes with codereaders for free. ANYTIME you CEL comes on, take it there and write down the codes.
In most cars newer than about 2000, this triggers the security shutdown. What about a dead battery? Why doesn't that trigger the lockdown? Because the computer monitors battery strength 24/7 and it knows the difference between sudden loss of power and slow ***** of the battery.
So IF that's what happened—and you should ALWAYS put make, model, engine, and year in any question; there is no one-size-fits-all about this kind of stuff—if that's what happened, someone who can access the deep levels of the PCM will have to unlock it. That means dealer or certified master mechanic shop will full repair equipment including computers.
on Apr 16, 2017