Hey guys wondering if an exhaust leak can produce the CEL

i am getting code 67

i installed aftermarket exhaust last year and before i stored the car one of the bolts came loose....didnt think anything of it at the time...went back to the place and they tighten it.

looking at it now i can see the connetion from the test pipe to the test pipe back there is the slightest gap.
i dont think i hear a leak but the CEL comes on when i put a heavier load on the car like going up a hill.

just seeing what you guys think. i am getting a shop to remove it and reinstall with new gaskets in the next few days

thanks, deryk.

 

67 Catalyst low efficiency

 

yah i have the code sheet and what not but im still unclear what "low efficiency" really means...like a leak...?

if so i hope a quick re install will help

 

Do you think the Cat could be plugged? Or the O2 sensor is dirty/not functioning correctly?

*just ideas*

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Morty &raquo;</TD></TR><TR><TD CLASS="quote">Hey guys wondering if an exhaust leak can produce the CEL

i am getting code 67

i installed aftermarket exhaust last year and before i stored the car one of the bolts came loose....didnt think anything of it at the time...went back to the place and they tighten it.

looking at it now i can see the connetion from the test pipe to the test pipe back there is the slightest gap.
i dont think i hear a leak but the CEL comes on when i put a heavier load on the car like going up a hill.

just seeing what you guys think. i am getting a shop to remove it and reinstall with new gaskets in the next few days

thanks, deryk.</TD></TR></TABLE>

I thought test pipes only work for cars that are running "closed-loop" with the ECU? It sounds as if your O2 sensor is searching for a specific perimeter found only in a catalytic converter and is not getting the proper sensor.

Does the car go into 'limp mode'? How is the fuel economy since the swap? Does the car smell like it's running richer than it did before the exhaust swap?

 

To the OP - I had CEL 67- "Catalyst system efficiency below threshold" in my ITR, my prelude, and probably other hondas. From old/dead catalytic converters, or when I had NO cat and a test pipe in their briefly.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Haleiwa-Brando &raquo;</TD></TR><TR><TD CLASS="quote">
I thought test pipes only work for cars that are running "closed-loop" with the ECU?</TD></TR></TABLE>

huh? do you know what you are talking about?

first off. if you run a test pipe you are going to get a CEL because of the secondary o2, one way or another.

about closed loop:
http://www.hondata.com/techclosed.html

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">It sounds as if your O2 sensor is searching for a specific perimeter found only in a catalytic converter and is not getting the proper sensor.</TD></TR></TABLE>

(i assume you mean parameter, not perimeter)

o2 sensors do one thing - produce a certain voltage based on the amount of oxygen it reads. It does not do anything else, that is its one and only parameter and whether or not there is a test pipe or a catalytic converter makes no difference, it still only takes a reading and sends a voltage.

if you dont have a catalytic converter - i'm guessing the CEL is from that, and nothing else.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris N &raquo;</TD></TR><TR><TD CLASS="quote">huh? do you know what you are talking about? </TD></TR></TABLE>

Easy there, killer. No need to get your panties in a wad. I should have added a disclaimer stating that I haven't touched a Type-R for almost three years.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris N &raquo;</TD></TR><TR><TD CLASS="quote">
first off. if you run a test pipe you are going to get a CEL because of the secondary o2, one way or another.

about closed loop:
http://www.hondata.com/techclosed.html

(i assume you mean parameter, not perimeter)

o2 sensors do one thing - produce a certain voltage based on the amount of oxygen it reads. It does not do anything else, that is its one and only parameter and whether or not there is a test pipe or a catalytic converter makes no difference, it still only takes a reading and sends a voltage.

if you dont have a catalytic converter - i'm guessing the CEL is from that, and nothing else.</TD></TR></TABLE>