Hey honda-tech,
Please help me diagnose this CEL on my stock EM1...

http://www.youtube.com/v/6IpEnNlG5lY

 

https://honda-tech.com/zerothread/1901557

Looks like Code 67 (Cat conv). Is your gas mileage bad? Does the car feel like it is clogged when you accelerate?

 

I was thinking it was my cat when i read the code to...but i wasn't sure about it. A full tank of gas will last me about a week and 1 day with 50 miles round trip doing 65-70 MPH 5 days a week.

 

67 indeed. I wonder though.... Are you running a bosch o2 sensor in the cat? I doubt the cat converter is bad

 

The 02 sensor is OEM since 2000. Would you recommend replacing it with a NEW OEM?

 

Do you get that sulfur smell when you step on the gas?

 

No. The car drives and runs normal. And everything works fine. Even the V-Tec.


Modified by D16Z6_turbo at 9:15 PM 8/27/2007

 

I would reset the ECU and see if the CEL comes on again.

 

Yeah, Id reset the ecu too.
Its pretty rare for cats to actually go bad. Ive even heard of cats with chunked filaments working fine and not throw #67.
If it comes back, I would look into borrowing a known good o2 first, swapping in for a test and see if the cat cel comes back. If it doesnt, get a new DENSO o2 first (theyre cheap in comparison)

 

omg he said v-tech
time for your thread to get hijacked and lots of new comments about cordless phones!!!

have you tried to reset the ecu and see if it comes back?

 

I don't mean to sound like a complete dumbass but i just check my car and i got 1 long and 10 short so that means i have a code 20 right

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 21 &raquo;</TD></TR><TR><TD CLASS="quote">I don't mean to sound like a complete dumbass but i just check my car and i got 1 long and 10 short so that means i have a code 20 right</TD></TR></TABLE>

No, you're reading it wrong - make a video. 20 would be two long blinks, then a longer pause in between.

It's probably 2 different CEL's (10 and something &lt;10) OR something in the teens.

 

That's why i was asking i will recheck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EL Vap133 &raquo;</TD></TR><TR><TD CLASS="quote">I would reset the ECU and see if the CEL comes on again. </TD></TR></TABLE>

I already tried resetting the ECU. It will work fine for about 20 minutes then turn back on.

 

although you really cant do it with a multimeter, you need a scope to watch the pattern. cause a 02 switchs so fast you need a scope to slow it down and watch but a good 02 sensor will switch from .1-.2v meaning lean and then up to .8-.9v showing rich and it oscillates up and down trying to reach sticometric or however you spell it. anyway to watch catalyst efficiency you should look at downstream 02 and see if it stays steady if it does then cat is good or if it oscilliates just like upstream then bad cat. best to take it to a shop where they have a scan tool with data or a scope. unless you just want to throw parts at it. either way will work