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Old 04-04-2014, 06:03 AM
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How many miles or cycles for readiness monitors.

I replaced the downstream 02 (bank 2, circuit 2). Reset the engine light. My inspection is due today.

How many cycles or miles until the emissions monitors are ready ? I have driven 73 miles so far after resetting the light and I have a scanner and it says the Catalyst monitor and EVAP monitors are not ready yet.
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Old 04-05-2014, 03:01 AM
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Re: How many miles or cycles for readiness monitors.

Catalyst monitors will run doing an almost identical drive cycle to the o2 sensor. doing 55-60mph light tip in on the throttle, when you get above that speed lift off and coast back down to 50-55 and repeat the tip in, if you can get onto a slight incline that speed even better then you can keep it there, you don't want a steep hill where you have to lean into it a bit more to keep your speed as too much throttle will stop the monitor.

Evap can take some time, I dont know what system you have, but that can take a week or so sometimes. To run the small leak test it must sit for specific lengths of time (like overnight). In Oregon and Washington you can pass with 1 monitor not run so I suggest you get back out on the freeway and get the catalyst monitor to run then try running it through.

I have had a tough time getting some cars to run monitors and all I could do was a battery disconnect then rerun all the monitors again.

Good luck!
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Old 04-05-2014, 05:34 AM
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Re: How many miles or cycles for readiness monitors.

Great info, thanks

Well since it's a 1999 and after 15 years old in MA, they didn't do any emissions testing, so I was good to go
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