OBDII Readiness Monitors (Can't pass emissions test)
Super Member
Joined: Feb 2008
Posts: 699
Likes: 44
From: PA
09 CLK550
The title seems relevant to me. In fact, I'm looking for the exact same thing about how to set the readiness code for the Catalyst monitor. Searching for this topic is how i came about this thread. i'm having the same issue. smog due the next of this month. ugh.
so does anyone know of any other drive cycle to ok this other than driving 48-54mph for 3 minutes? Doesn't seem to work for me.
so does anyone know of any other drive cycle to ok this other than driving 48-54mph for 3 minutes? Doesn't seem to work for me.
Newbie
Joined: Feb 2007
Posts: 8
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Don't know the MB drive cycle, but most cat monitors require some steady state and a fuel cut event (lift throttle, decelerate for a breif time) like coming off an onramp. Keep speed to 55 max. If you want to know what drive cycle all OBD are required to run on, do a search for 40CFR Part 86...don't know the subpart offhand, but there is an table for the speed/time trace in one of the Appendix for the LA-4 drive cycle. Every monitor MUST run during this cycle. Usually cat monitors run during the second hill event, about 200 seconds into the trace.
Last edited by jza80; Feb 26, 2011 at 01:13 AM.
Thread Starter
Junior Member
Joined: Jan 2010
Posts: 66
Likes: 2
AMG C63
A Reflash was the Cure...
Essentially a small portion of the Kleeman tunes incorrectly had the readiness monitors disabled and / or the rear O2 sensors were disabled (this is typically done for customers that are running Race Headers without cats)
Kleeman (Cory / Brandon) stepped up right away and resolved the issue. Obviously it was a bit inconvienant but these things happen... I give them props for being a stand up organization and acting fast.
After the new TUNE was installed, I drove according to the procedure in my previous post (link). The monitors cleared very quickly and we passed emissions easily even without the rear cats (replaced with an X).
Thanks to everyone for their help!
Essentially a small portion of the Kleeman tunes incorrectly had the readiness monitors disabled and / or the rear O2 sensors were disabled (this is typically done for customers that are running Race Headers without cats)
Kleeman (Cory / Brandon) stepped up right away and resolved the issue. Obviously it was a bit inconvienant but these things happen... I give them props for being a stand up organization and acting fast.
After the new TUNE was installed, I drove according to the procedure in my previous post (link). The monitors cleared very quickly and we passed emissions easily even without the rear cats (replaced with an X).
Thanks to everyone for their help!
Thread Starter
Junior Member
Joined: Jan 2010
Posts: 66
Likes: 2
AMG C63
The title seems relevant to me. In fact, I'm looking for the exact same thing about how to set the readiness code for the Catalyst monitor. Searching for this topic is how i came about this thread. i'm having the same issue. smog due the next of this month. ugh.
so does anyone know of any other drive cycle to ok this other than driving 48-54mph for 3 minutes? Doesn't seem to work for me.
so does anyone know of any other drive cycle to ok this other than driving 48-54mph for 3 minutes? Doesn't seem to work for me.
Last edited by Vegas_AMG_C63; Feb 28, 2011 at 07:50 PM.
Thread Starter
Junior Member
Joined: Jan 2010
Posts: 66
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AMG C63
In any case, I'll hand this topic over to Kleeman from here to explain further, if necessary. I'm sure they will provide you with the best information.
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Joined: Feb 2003
Posts: 5,983
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From: Vegas and Vancouver, BC
.
A Reflash was the Cure...
Essentially a small portion of the Kleeman tunes incorrectly had the readiness monitors disabled and / or the rear O2 sensors were disabled (this is typically done for customers that are running Race Headers without cats)
The monitors cleared very quickly and we passed emissions easily even without the rear cats (replaced with an X).
Essentially a small portion of the Kleeman tunes incorrectly had the readiness monitors disabled and / or the rear O2 sensors were disabled (this is typically done for customers that are running Race Headers without cats)
The monitors cleared very quickly and we passed emissions easily even without the rear cats (replaced with an X).
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Thread Starter
Junior Member
Joined: Jan 2010
Posts: 66
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AMG C63
In order to pass swog with the new OBDII regulations, you need to have your monitors enabled and live data streaming from your front & rear O2 sensors.
If you have Race Headers and no cats, there is no way to pass emissions with them installed at least in states like NV and CA. I know some states backeast don't even really have smog tests (SC I believe?)
If you have a Race Header Tune... the programmers will turn off the monitors and any CEL when the codes are related to not having cats but... the root problem is still there and the Smog Stations will pick it up.
I've often wondered what owners with this setup are doing (besides switching the system back to stock or having a friend pass them).
In my case, my primary cats are intact but they mistakenly disabled the monitors and thus we had the problem.
If you have Race Headers and no cats, there is no way to pass emissions with them installed at least in states like NV and CA. I know some states backeast don't even really have smog tests (SC I believe?)
If you have a Race Header Tune... the programmers will turn off the monitors and any CEL when the codes are related to not having cats but... the root problem is still there and the Smog Stations will pick it up.
I've often wondered what owners with this setup are doing (besides switching the system back to stock or having a friend pass them).
In my case, my primary cats are intact but they mistakenly disabled the monitors and thus we had the problem.
MBWorld Fanatic!
Joined: Aug 2005
Posts: 2,207
Likes: 2
From: North Jersey
2012 CTS-V
In order to pass swog with the new OBDII regulations, you need to have your monitors enabled and live data streaming from your front & rear O2 sensors.
If you have Race Headers and no cats, there is no way to pass emissions with them installed at least in states like NV and CA. I know some states backeast don't even really have smog tests (SC I believe?)
If you have a Race Header Tune... the programmers will turn off the monitors and any CEL when the codes are related to not having cats but... the root problem is still there and the Smog Stations will pick it up.
I've often wondered what owners with this setup are doing (besides switching the system back to stock or having a friend pass them).
In my case, my primary cats are intact but they mistakenly disabled the monitors and thus we had the problem.
If you have Race Headers and no cats, there is no way to pass emissions with them installed at least in states like NV and CA. I know some states backeast don't even really have smog tests (SC I believe?)
If you have a Race Header Tune... the programmers will turn off the monitors and any CEL when the codes are related to not having cats but... the root problem is still there and the Smog Stations will pick it up.
I've often wondered what owners with this setup are doing (besides switching the system back to stock or having a friend pass them).
In my case, my primary cats are intact but they mistakenly disabled the monitors and thus we had the problem.
window. 4 year new window sticker + a 1 year extension. My car
is not due for inspection until 2015.
MBWorld Fanatic!
Joined: Feb 2003
Posts: 5,983
Likes: 21
From: Vegas and Vancouver, BC
.
In order to pass swog with the new OBDII regulations, you need to have your monitors enabled and live data streaming from your front & rear O2 sensors.
If you have Race Headers and no cats, there is no way to pass emissions with them installed at least in states like NV and CA. I know some states backeast don't even really have smog tests (SC I believe?)
If you have a Race Header Tune... the programmers will turn off the monitors and any CEL when the codes are related to not having cats but... the root problem is still there and the Smog Stations will pick it up.
If you have Race Headers and no cats, there is no way to pass emissions with them installed at least in states like NV and CA. I know some states backeast don't even really have smog tests (SC I believe?)
If you have a Race Header Tune... the programmers will turn off the monitors and any CEL when the codes are related to not having cats but... the root problem is still there and the Smog Stations will pick it up.
Thread Starter
Junior Member
Joined: Jan 2010
Posts: 66
Likes: 2
AMG C63
The ECU uses a pre cat O2 sensor and a post Cat O2 sensor.
The precat sensor is used to measure air / fuel ratio and the ECU uses this data to determine how much fuel to add to get the best mileage or horsepower.
The ECU then uses the readings from the post cat sensor to determine how efficient the catalytic converters are by measuring the delta between the readings.
So there needs to be a cat in the middle there otherwise you will get a catalyst effeciency code and you will not pass emissions.
Typically in a catless car, you'll not be able to clear the monitors for a smog check and you'll get a CEL for catalytst ineffeciency (since there isn't one). Programmers can keep the CEL from displaying on your dash but I'm not aware of any that have figured out how to also pass a smog check.
I'm pretty sure NV is now testing once a year... It's getting to be more like California every day.
The precat sensor is used to measure air / fuel ratio and the ECU uses this data to determine how much fuel to add to get the best mileage or horsepower.
The ECU then uses the readings from the post cat sensor to determine how efficient the catalytic converters are by measuring the delta between the readings.
So there needs to be a cat in the middle there otherwise you will get a catalyst effeciency code and you will not pass emissions.
Typically in a catless car, you'll not be able to clear the monitors for a smog check and you'll get a CEL for catalytst ineffeciency (since there isn't one). Programmers can keep the CEL from displaying on your dash but I'm not aware of any that have figured out how to also pass a smog check.
I'm pretty sure NV is now testing once a year... It's getting to be more like California every day.
Last edited by Vegas_AMG_C63; Mar 2, 2011 at 10:30 PM.
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Joined: May 2008
Posts: 1,601
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From: dfw
'10 C63
any updates on the drive cycle for the c63 or w204?
i've got the oxygen sensor and the oxysensor heater not ready... i need either one of them ready to pass inspection... been driving quite a bit and they are not on and i'm not getting any cels either to tell me something isn't working.
i've got the oxygen sensor and the oxysensor heater not ready... i need either one of them ready to pass inspection... been driving quite a bit and they are not on and i'm not getting any cels either to tell me something isn't working.
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Joined: Oct 2007
Posts: 2,298
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From: Texas
10 C six trizzle
its something along the lines of drive 65-75mph for 10 minutes and do 3 deceleration cycles (just let off the gas pedal and coast without braking) of atleast 20 seconds within one drive cycle. you'll need to do this atleast 2 separate cycles. If your tune has these disabled it may also cause them to never go ready.
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Joined: May 2008
Posts: 1,601
Likes: 14
From: dfw
'10 C63
secondary air
o2 heater
o2 sensor
after driving some more the secondary air one went to ready status about 2 days ago. now i'm left with the o2 heater and o2 sensor.
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Joined: Feb 2003
Posts: 5,983
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From: Vegas and Vancouver, BC
.
That is weird. My car was in for service last year and somehow my readiness monitors were turned off (car is tuned and passed emissions the year prior) and when I went to emissions, it failed the readiness section. Not sure what they did and paperwork didn't say they reflashed. Tried to reset cycle and it didn't work and had to send back for a re-flash.
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Joined: Jun 2007
Posts: 1,022
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From: Los Angeles, CA
2015 C400 Tenorite Gray
Can you confirm what you did for drive cycle? Having the same issue. In my case I had the manifold repaired and then cleared the pending code. Thx
Last edited by Nicholi2007; Jan 10, 2019 at 10:40 AM.
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Joined: May 2008
Posts: 1,601
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From: dfw
'10 C63
I drove thousands of miles and it never went to ready status.
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Joined: Feb 2008
Posts: 655
Likes: 4
From: Surf City, USA
What I like!
02 sensors "not ready" with Kleemann tune
Wish I had searched the forum 1000 miles ago. Great info, thanks to all.
I have been to smog guy twice, dealer twice, Indy shop once. 6 weeks later sensors still not ready. Failed 3 times now.
Car has 29k miles now and still flawless!
Hopefully Kleemann / ACG can get this resolved on my '08.
I have been to smog guy twice, dealer twice, Indy shop once. 6 weeks later sensors still not ready. Failed 3 times now.
Car has 29k miles now and still flawless!
Hopefully Kleemann / ACG can get this resolved on my '08.
Super Member
Joined: Feb 2008
Posts: 655
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From: Surf City, USA
What I like!
Hey SinCity! Got my updated K1 file and the car passed! 
Cory at Kleemann was very straightforward and updated my file without issue. Thank you Cory! James at ACG in San Diego did the install and I drove back to OC and straight to the smog guy -- car passed with no problems. Very happy (guess I will put that Hellcat on hold - for now
)
I must add that James' business / ACG has really grown and has an impressive list of clientele and some really hot cars in there! This can only happen when you are focused, professional, trustworthy and consistently provide excellent service. Great to see one of the good guys do so well!
My '08 is still solid as a rock and dialed in. I love that it doesn't have all the tech going into cars now. I just want hydraulic steering, fixed suspension, and a hand built engine - from a factory I am grateful to have been able to visit.
AMG Uber Alles!
Cory at Kleemann was very straightforward and updated my file without issue. Thank you Cory! James at ACG in San Diego did the install and I drove back to OC and straight to the smog guy -- car passed with no problems. Very happy (guess I will put that Hellcat on hold - for now
)I must add that James' business / ACG has really grown and has an impressive list of clientele and some really hot cars in there! This can only happen when you are focused, professional, trustworthy and consistently provide excellent service. Great to see one of the good guys do so well!
My '08 is still solid as a rock and dialed in. I love that it doesn't have all the tech going into cars now. I just want hydraulic steering, fixed suspension, and a hand built engine - from a factory I am grateful to have been able to visit.
AMG Uber Alles!
Junior Member
Joined: Feb 2018
Posts: 63
Likes: 2
From: Henderson,NV
2014 C63 AMG Coupe 507 ED
[QUOTE=Sincity;4533535]Cool. Vegas_AMG and I live in the SW. Whereabouts are you? There was another guy that lives in Red Rock; forgot his SN.
Hey I live in Henderson ? We should meet up! I’m having the issues too with the smog test with my LTH and no cats
Hey I live in Henderson ? We should meet up! I’m having the issues too with the smog test with my LTH and no cats
