![]() No wonder the car’s owner couldn’t get the monitor to run!I threw on the hazards endured some dirty looks, but the catalyst monitor inc message switched to catalyst monitor ready, just like it should. Not only that, but 50 MPH is well under freeway speed when the freeway is clear enough to drive that far without having to slow down. That’s about 8 miles at the same speed, without slowing down or speeding up. One car I worked on had to be driven at 50 MPH with a steady throttle for 10 minutes. Here’s one of the worse catalyst drive cycles ever. I’d love to give you exact catalyst monitor drive cycle instructions, but there are a whole lot of variations. We usually send people to 7 Days a Week Smog in Berkeley. Most smog inspection stations will tell you over the phone. It’s not permissible for most cars, but there are a few older cars where California has made an exception. Can I pass CA smog with catalyst monitor not readyĪs of this writing, maybe. For instance, if you only drive around town, the catalyst monitor will never run, at least not on any car I know of. By conditions I mean things like vehicle speed, the amount of throttle, and the combination of the two over time. The monitor requires certain conditions to run. There isn’t a magical number of miles that will set your converter monitor to ready. How many miles to drive before smog check We’ll talk more about that later, but let’s start with the assumption that your car is OK, which is the case almost all of the time. This is very important to know if the catalyst monitor just plain won’t run, no matter how much you drive. In the case of the catalyst monitor, the O2 sensors are the key sensors. ![]() All monitors, including the catalyst monitor, are dependents on sensors. The catalyst monitor is a series of tests the car’s computer (ECM) does to determine if the catalytic converter is working normally. It’s extremely rare that there’s a problem with the car. The catalyst drive pattern is almost always something you can do yourself while driving somewhere you needed to go anyway. If you’re ready to give up, we’ll do it for you, and if we can’t get it to run, we’ll find out why it’s not running and fix the problem(s), but we charge. The monitor for the catalytic converter is usually one of the most difficult to get to run. You think, “I’ve already driven the car!” Wash, rinse, repeat - until you have no hair left. The guy says you’ve got to drive some more. The guy says you’ve got to drive around some more. Since you’re reading this, I’m guessing that you’ve learned what a monitor is, and are pretty frustrated. “Not so fast”, says the state, “We’re also going to check to see if the monitors are complete.”Ī few years ago, most drivers (and a few mechanics) had no idea what a monitor is. “Ah ha!”, says the crafty consumer, “I’ll just disconnect the battery to clear codes and then go pass the smog test!” ![]() It’s simple test and has reduced the price of smog testing. If the check engine light is on, the car fails. Instead, we check to see if the vehicle’s computer has found any problems that might cause increased emissions during the smog inspection. This prevents people from disconnecting the battery to clear their CEL just before taking it to get smog checked.How do you get a catalyst monitor to run? Why do you need it to run? Well, in California all vehicles model year 2000 and newer don’t require a tailpipe emissions test. You lose obd2 readiness when you clear codes or lose KAM power. The service manual will also include instructions on what types of driving (it’ll specify something like: stop and go traffic between 0-25mph or highway driving between 45-55mph etc.) is most efficient to set each of the individual monitors to ready. Some monitors have convoluted criteria before they will run, they often read something like “ECT > 140F, with vehicle speed at 0, and IAT between 70-150F, with fuel level between 1/4 and 3/4 tank” or something like that. The specifics of what is needed to satisfy each monitors drive cycle are in the service manual. Some monitors run continuously, some run only under certain conditions and may require 1-2 drive cycles. If memory serves, there are 6(?Or is it 8?) on the Honda with the others being listed as “not applicable or not equipped”. Dependent on the car manufacturer, there are 6-10 obd2 emissions monitors in the car.
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