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Cat problems. Please help!

 
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Old 01-29-2013, 02:17 PM
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Icon9 Cat problems. Please help!

Okay, so I recently took my newly acquired lude (2000 SH) for it's emission test and it failed in two spots. I cleaned out the EGR and ports with minimal pain and that code went away. But I had the dreaded P0420 Cat code. After trying all the snake oil and wizardry the internet had to offer in ways of cleaning it without replacing it, nothing worked. So I bought a new cat and new o2 sensor because I knew that sonofabitch wasn't coming off. Flash forward to after the installation and pulling the clock radio fuse to reset the check engine light. It comes back on So I grabbed the trusty paperclip and now its giving me DTC code 63, secondary o2 sensor. Not having a scan tool to see exactly what the error code is I sit here stumped and defeated. Any insight would be much appreciated as my lude is now off the road until I can shake this engine light.
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Old 01-29-2013, 02:43 PM
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Re: Cat problems. Please help!

you replaced both o2 sensors? which brand and type did you get? were they direct fit that had connectors, or did you have to splice the wires to the factory connector?

the secondary o2 sensor does not do anything as far as air:fuel for the motor, just makes sure the cat is working. make sure it is plugged in and that the wires are correct. if you need a wire diagram, im sure there are plenty to be found with a simple google search.

you can also download a free helms service manual from here: http://www.preludezone.com/general-t...e-manuals.html
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Old 01-29-2013, 03:01 PM
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Re: Cat problems. Please help!

No I only replaced the secondary one. The one connected to the flex pipe wasn't giving me any problems so I left it alone. The brand I bought was NTK and it was a direct fit, no splicing required
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Old 01-29-2013, 03:24 PM
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Re: Cat problems. Please help!

code 63 can mean: P0137 (low voltage), P0138 (high voltage), P0139 (slow response)

these are the obdII trouble code pages for those codes:
P0137 (low voltage)
P0138 (high voltage)
P0139 (slow response)

try unplugging the negative battery terminal for 15+ minutes, then reconnecting it. when the sensor was replaced, the computer may need to be reset to "relearn" the change. it will most likely run rich for about 20 mins worth of driving after resetting the computer, so you may want to take the long way to the emissions test place and drive at a constant speed for a while for it to be the best it can be.
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Old 01-29-2013, 10:46 PM
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Re: Cat problems. Please help!

Alright thanks a lot, I'll give it a try before I head to work. Stupid computers, my prelude would have passed if it was the sniffer test but the new test only communicates with the ECU. So if you have any error code's (in this case the cat was operating below 95% percent efficiency) it's an automatic fail. Even if the car isn't putting out a lot of emissions.
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Old 01-30-2013, 03:45 AM
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Re: Cat problems. Please help!

new air/fuel filters
clean egr and injectors
new ignition parts (plugs & wires, distributor cap and rotor)
new o2 sensor(s) & cat
new pcv
check vacuum/exhaust leaks
adjust ignition

usually these get you pass the emissions
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Old 01-30-2013, 08:15 AM
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Re: Cat problems. Please help!

Quote:
Originally Posted by TypeT View Post
new air/fuel filters
clean egr and injectors
new ignition parts (plugs & wires, distributor cap and rotor)
new o2 sensor(s) & cat
new pcv
check vacuum/exhaust leaks
adjust ignition

usually these get you pass the emissions
He replaced the cat and downstream o2 sensor and is getting a downstream o2 sensor code.

I think the computer just needs to be reset. (Unplug neg battery cable for 15 mins)
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Old 01-31-2013, 03:34 PM
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Re: Cat problems. Please help!

You were right rocker! Thank you oh so god dang much. I passed the emissions test this morning with flying colours. Much appreciated :)
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catalytic converter, dtc code 63, o2 sensor


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