Quote:
Originally Posted by elykrunner
Hi, I am having similar issue with evap and cat not setting. It took 100 miles for the O sensor to come on. I never had a code pop up, so today I tried tripping a code by unplugging the evap sensor, and that didnt work, so I took off the gas cap too. Neither tripped a code. Reading this I would assume it would take 2 drives to make a code appear? Just trying to figure out if my computer is working properly, which I assume it is because the other monitors are ready?
So Far, I replaced the o2 sensors the the throttle position sensor and gas cap with no avail. Last time this happened I replaced the ground from the battery to the body of the car and that fixed it.
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Yes, you need two drive cycles to set the permanent code for the evap or cat and light the CEL. If your code reader reads pending codes, you should be able to see if that is set after one drive cycle although the CEL will not light. Also, these monitors do not run continuously. They only run when the preconditions are satisfied - if the monitor did not run, it would not even set a pending code. Attached the TSB I referenced in my original post as I see my previous link is no longer working.
