cel code 67
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From: New haven, Ct, usa
cel code 67
cel code 67
94+ Integra: Catalyst system Efficiency Below Threshold malfunctioning or defective catalyst system
I got this cel code last night and I am hoping I don't need a new cat.
I have a custom obx stainless 2.5 in. cat.
Has anyone else had this problem? If so what did you have to do?
Any info or help please
Thanx
Alex
94+ Integra: Catalyst system Efficiency Below Threshold malfunctioning or defective catalyst system
I got this cel code last night and I am hoping I don't need a new cat.
I have a custom obx stainless 2.5 in. cat.
Has anyone else had this problem? If so what did you have to do?
Any info or help please
Thanx
Alex
Thread Starter
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Joined: Mar 2002
Posts: 371
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From: New haven, Ct, usa
Re: cel code 67 (Bob#455)
I got a code 67 over a month ago. I reset the ECU, and the code has not come back on yet even after a full ~2.5 hour track day and an autox. 
Thanx
Alex
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From: Orange County, CA
Re: cel code 67 (TypeR0936)
My shitty Random cat gives me CEL 67's all the time. I just reset the ECU, or the code goes away after a while. Hmm, I wonder if I would pass smog with the CEL on. That would be interesting to see if it passes eventhough the catalyst is operating below the "threshold."
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From: Texas, USA
Re: cel code 67 (SpoonEK2)
Hey i also have had this code.....since may. so i got a new O2 sensor and i just changed them out and it was fine.....then an hour into driving the cel comes on and the code was 67 AGAIN!!! what else can be contributed to this? should i take it to acura?? cause eversince i got this code i only get like 250-270 miles a tank. and that sux!! i mean thats not even 20 mpg!!!! please help!!
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From: Tampa, FL
Re: cel code 67 (LillDragun)
Hey i also have had this code.....since may. so i got a new O2 sensor and i just changed them out and it was fine.....then an hour into driving the cel comes on and the code was 67 AGAIN!!! what else can be contributed to this? should i take it to acura?? cause eversince i got this code i only get like 250-270 miles a tank. and that sux!! i mean thats not even 20 mpg!!!! please help!!
I just removed the CEL bulb.
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From: Orange County, CA
Re: cel code 67 (LillDragun)
Hey i also have had this code.....since may. so i got a new O2 sensor and i just changed them out and it was fine.....then an hour into driving the cel comes on and the code was 67 AGAIN!!! what else can be contributed to this? should i take it to acura?? cause eversince i got this code i only get like 250-270 miles a tank. and that sux!! i mean thats not even 20 mpg!!!! please help!!
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From: Orange County, CA
Re: cel code 67 (SpoonEK2)
One more thing...it can mean a bad O2 sensor. You won't know from the CEL alone. You have to check the error codes in the computer with a OBDII code reader as stated in the helms manual. I'm perplexed because this happened with my old random cat and it's happening with my new replacement random cat. Random just sucks. It's not consistent either. I might be fine for 5,000 miles and then get a string of CEL 67's. Bad gas maybe?
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From: Tampa, FL
Re: cel code 67 (SpoonEK2)
One more thing...it can mean a bad O2 sensor. You won't know from the CEL alone. You have to check the error codes in the computer with a OBDII code reader as stated in the helms manual. I'm perplexed because this happened with my old random cat and it's happening with my new replacement random cat. Random just sucks. It's not consistent either. I might be fine for 5,000 miles and then get a string of CEL 67's. Bad gas maybe?
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From: Tampa, FL
Re: cel code 67 (aargh867)
code 67 causes the car to run rich, hence the poor gas mileage
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From: Okinawa, USA
Re: cel code 67 (Dave-ROR)
Hey i also have had this code.....since may. so i got a new O2 sensor and i just changed them out and it was fine.....then an hour into driving the cel comes on and the code was 67 AGAIN!!! what else can be contributed to this? should i take it to acura?? cause eversince i got this code i only get like 250-270 miles a tank. and that sux!! i mean thats not even 20 mpg!!!! please help!!
uhmm.. code 67 doesn't equal a bad o2 sensor. it just means the readings between the primary and secondary o2 sensors wasn't different enough (and thus the cat is "not working".
I just removed the CEL bulb.
uhmm.. code 67 doesn't equal a bad o2 sensor. it just means the readings between the primary and secondary o2 sensors wasn't different enough (and thus the cat is "not working".
I just removed the CEL bulb.
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From: Tampa, FL
Re: cel code 67 (Gatecrasher18AF)
Isn't there a post somewhere that says you can cover the secondary O2 sensor with like electrical tape and foil?
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From: san bruno, ca, usa
Re: cel code 67 (SpoonEK2)
code 67. poor catalyst blah blah. okay all you really need to do is clean the throttle body and replace plugs. i know it doesnt sound like it relates to the cat at all and no manuals say this either. it has nothing to do with the secondary 02. i have repaired a lot of these hondas with the same code and that was all i did. no customer come backs.
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From: Yokohama, Japan
Re: cel code 67 (bearingburner)
code 67. poor catalyst blah blah. okay all you really need to do is clean the throttle body and replace plugs. i know it doesnt sound like it relates to the cat at all and no manuals say this either. it has nothing to do with the secondary 02. i have repaired a lot of these hondas with the same code and that was all i did. no customer come backs.
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From: Tampa, FL
Re: cel code 67 (Reid)
Please explain how changing the TB and plugs increases the difference between the readings of the primary O2 and the secondary O2.
edit: perhaps no customers come back because they've realized that he doesn't know wtf he's doing to fix the code 67.. hmm..
-Dave, who has never heard of this "fix" so can't really say it wont work but there is no logic to say it will.
[Modified by Dave-ROR, 8:03 AM 11/12/2002]
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From: USA
Re: cel code 67 (TypeR0936)
I have the same code and when I reset my ecu it comes back on after a couple of days. My gas mileage does seem to be shitty also. I have a Carsound cat and I cant seem to make the cel 67 go away. So code 67 means the car is running rich? 
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From: Tampa, FL
Re: cel code 67 (R-Rated)
I have the same code and when I reset my ecu it comes back on after a couple of days. My gas mileage does seem to be shitty also. I have a Carsound cat and I cant seem to make the cel 67 go away. So code 67 means the car is running rich?
Junior Member
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From: USA
Re: cel code 67 (Dave-ROR)
So would replacing the bad primary o2 stop the cel from coming back on and make prevent car not run rich ? How can you tell if your car is running rich or lean?
[Modified by R-Rated, 9:57 AM 11/12/2002]
[Modified by R-Rated, 9:57 AM 11/12/2002]
Honda-Tech Member
Joined: May 2002
Posts: 11,209
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From: Tampa, FL
Re: cel code 67 (R-Rated)
So would replacing the bad primary o2 stop the cel from coming back on and make my car not run rich ?
-Dave, who has had a 67 for over a year and gets 27-28mpg in the city with a mix of "low" rpm driving and redlining..