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SMOG Test - OBDII Monitors Not Ready #5217777 09/20/19 09:57 AM
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JeffKeryk Offline OP
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Recently my 2001 Tundra V8, 197K on the ODO, threw 2 codes. Never before...
I used my module and Torque app to clear the codes, to see if they return.
I generally do this... The codes did not return.
It was maybe 30 miles ago.

Took her in for the 2 year SMOG check; it always passes with ease. The truck is perfect.
It failed due to "OBDII Monitors Not Ready", citing Catalyst and Evaporative System.
As I recall, Evap was one of the codes thrown.

The operator told me to drive the vehicle for 1,000 miles to generate some data. "It lost it's memory."
Please offer your experiences.
I appreciate your guidance.

Last edited by JeffKeryk; 09/20/19 09:58 AM.

2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: SMOG Test - OBDII Monitors Not Ready [Re: JeffKeryk] #5217782 09/20/19 10:01 AM
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A few minutes around town then the hwy should set them.


02 Wrangler Napa high milage 10w40
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Re: SMOG Test - OBDII Monitors Not Ready [Re: JeffKeryk] #5217784 09/20/19 10:03 AM
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e55amgbenz007 Offline
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Look up online for the "drive cycle" to reset the monitors for the Tundra. A good 1-200 miles driven though, over the course of a few days should reset everything.

Re: SMOG Test - OBDII Monitors Not Ready [Re: JeffKeryk] #5217792 09/20/19 10:09 AM
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Does your app not state if the monitors are ready?

Re: SMOG Test - OBDII Monitors Not Ready [Re: MarkM66] #5217801 09/20/19 10:17 AM
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JeffKeryk Offline OP
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Originally Posted by MarkM66
Does your app not state if the monitors are ready?

Dunno. Gonna check; I was wondering that myself. Thanks.


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: SMOG Test - OBDII Monitors Not Ready [Re: JeffKeryk] #5217858 09/20/19 11:27 AM
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Did you actually fix anything? Or just praying they don’t come back?


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Re: SMOG Test - OBDII Monitors Not Ready [Re: mattd] #5217873 09/20/19 11:36 AM
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Originally Posted by mattd
Did you actually fix anything? Or just praying they don’t come back?

I was diagnosing.
My practice is to clear the codes and see if they return.
In my experience, they come back immeadiately or not at all.
A loose gas cap is a common cause to throw an evap code.
A neighbor recently borrowed our Tundra and gassed it up.
The truck has never thrown a code before.
When they returned it, they said, "Your check light in on."
Due to age, I was thinking an O2 sensor... But it was an evap code error.

So no, I did not fix anything. So far there is nothing to fix.
I don't pray about cars.

Last edited by JeffKeryk; 09/20/19 11:37 AM.

2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: SMOG Test - OBDII Monitors Not Ready [Re: JeffKeryk] #5217874 09/20/19 11:36 AM
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100 mile, not 1000. Takes a few drive cycles, some highway, some local.
Every vehicle make should have the specific cycle to get them to set, but most are less than 100 miles.

No idea if the torque app shows if systems are ready, but I would think it would. Even my cheap $10 reader shows the status of Cat, evap, etc.


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Re: SMOG Test - OBDII Monitors Not Ready [Re: blupupher] #5217878 09/20/19 11:38 AM
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JeffKeryk Offline OP
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Originally Posted by blupupher
100 mile, not 1000. Takes a few drive cycles, some highway, some local.
Every vehicle make should have the specific cycle to get them to set, but most are less than 100 miles.

No idea if the torque app shows if systems are ready, but I would think it would. Even my cheap $10 reader shows the status of Cat, evap, etc.

Perfect. Thanks. Will do today.


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: SMOG Test - OBDII Monitors Not Ready [Re: Chris142] #5217891 09/20/19 11:56 AM
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It varies by manufacturer and even vehicle model. My Mustang and XTerra will both set all monitors within 15-20 miles and a single warmup, but my old Cavalier required 5 separate warm-up cycles to set the cat monitor.

I've never had a need to check on the Camry, Versa, or Tacoma.

Torque dues show monitor status, under realtime info > emissions readiness

Last edited by Anduril; 09/20/19 12:00 PM.

2015 Nissan Versa Note 1.6/5MT
2012 Toyota Tacoma 2.7/4AT
2007 Toyota Camry 2.4/5AT
2005 Nissan XTerra 4x4 4.0/6MT
2002 Mustang GT Convertible 4.6/5MT
2009 Kawasaki Vulcan 900
2013 Hyosung ST7
Re: SMOG Test - OBDII Monitors Not Ready [Re: JeffKeryk] #5217917 09/20/19 12:25 PM
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EVAP takes a while to figure out, but catalyst should run the next time you hit the highway.

https://justsmogs.com/wp-content/uploads/2016/04/READINESS_MONITOR_DRIVE_PATTERNS_T-EG02-003.pdf

Re: SMOG Test - OBDII Monitors Not Ready [Re: JeffKeryk] #5217924 09/20/19 12:30 PM
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Echo the look up drive cycle. Also look up California smog check requirements for that specific vehicle. Evap is the hardest monitor to set. Engine and outside temp requirements, gas tank has to be between 1/4th and 3/4th filled, etc.etc. On my RAV4 it was so hard to set it was exempted.
Buy an OBD II code reader that will tell you codes and which monitors are set. It will be the best money you ever spent.

Never mind about the OBD reader if Torque provides monitor readiness information. And looking it up online I see evap not ready is acceptable to pass if it is the only monitor not set. I had a Colorado that would fail at the 400 mile point. I would reset the monitors, do a couple of drive cycles, then have it smogged before it completed the test and failed.

Last edited by ArrestMeRedZ; 09/20/19 12:42 PM. Reason: Add info
Re: SMOG Test - OBDII Monitors Not Ready [Re: JeffKeryk] #5217931 09/20/19 12:37 PM
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Toyota tends to be picky about running certain cycles like the EVAP one, where the car needs to have more than 1/2 tank of fuel and must sit out for more than 6 hours. The EGR, cat and misfire monitors should run on a drive.

I hooked up my Carista reader for laughs and giggles after the parent's Sienna was "brain dead" from a disconnected battery. I noticed some monitors were running when the car was started and I saw a few flick on to complete as the car was driven. Now the Prius, since it does use a bladder fuel tank and a EVAP pump, Toyota wants that car to remain stationary for at least 6 hours so the pump can run and the monitor can check for any leaks beyond a set reference value(in this case, there's a orifice in the EVAP module as a reference "leak").

Re: SMOG Test - OBDII Monitors Not Ready [Re: JeffKeryk] #5218021 09/20/19 02:05 PM
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Outstanding contributions.
I appreciate your guidance.

I just drove 35 miles to Menlo Park on the freeway. No check engine light.
I will drive another 50 and fill 'er up.

Kinda like a new adventure.
Dang Tesla don't throw no codes.... Ha!
Kidding; I love this ols Tundra.

Last edited by JeffKeryk; 09/20/19 02:09 PM.

2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: SMOG Test - OBDII Monitors Not Ready [Re: JeffKeryk] #5218112 09/20/19 04:24 PM
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Had the same problem a few months ago with a Camry V6. Basically the drive cycles test is to prevent people from resetting the ECU if they have a check engine light.

Those drive cycles are very manufacturing specific. I remember you have to keep the gas tank half instead of full, and drive however many miles, starting (both warm and cold), and however minutes between certain speed. Best to look up how it is online.

Make sure you have a scanner to see if the cycle is done. I remember my smog guy suggested an Autel $35 scanner from Amazon. He said that matches what he sees when he smog.


"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
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