3 ms·

Of course, but they did that with a sensor. If anything my car computer says it has an emissions issue. But maybe I'm missing something.

• tyingq 4y ago
  "emission readiness" is a specific state of the computer where all of the sensors are reporting "good for an extended period of time". It takes several drive cycles to get into that state. So that you can't, for example, reset the ECU and drive in for an inspection right then. They do also do live tests with a sensor, but the "ECU says car is emissions ready" is an additional requirement. At least in many US states...maybe not yours?
  • someweirdperson 4y ago
    > all of the sensors are reporting "good for an extended period of time" Not exactly. Boring monitors like those for sensors or actuators are excluded / always reported as ready. Even misfire is always ready, and fuel was, too, until recently. But of course since the more intersting monitors take long to complete, when they do reach ready, simple sensor checks would long have set at least a pending code if there was a problem. Next update in california will likely require all monitors to be included in the readiness status latest for model year 2027.
    • tyingq 4y ago
      Hrm. I've done this myself with the OBD-II reader and some do come up pretty quickly, but they took all some amount of running/driving to be ready if you reset the ECU...which people would try if there's a code stored / check engine light on. Some of them take quite a while to be ready.