Question about 1996 Honda Civic

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My 1996 Honda Civic EX is not pass SOG check. some technician said catalytic converter, some said temperture control. wich one should I replace?

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  • james bierman Aug 19, 2010

    when you failed the smog test the shop should have given you a print out of failing exhaust gases and their amounts please post the data

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  • Honda Master
  • 4,336 Answers

I suggest that you not parts replace, but rather get is diagnosed. Each and every piece can cause failure. The numbers on the test sheet will give the first clues...
The parts are way too costly to take a shot at it...

Posted on Aug 19, 2010

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1 Answer

Why is my 2000 honda civic ex keep shutting off when it gets over 4000 rpms


After 14 years I think it would be reasonable to have bad catalytic converter. Is there some reason your not accepting this?

May 04, 2014 | 2000 Honda Civic

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2001 honda civic ex


Nope, catalytic converter wont do that

Mar 29, 2014 | Cars & Trucks

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Honda civic 1998 EX check engine light on codes p300 p0301 p302 p303 p304


I don't think it is your catalytic converter because your light usually flashes and a bad cat I never heard of them causing a misfire. I ran your other code it is for a faulty EGR system. Exhaust gas recirculation excessive. You are getting too much exhaust gas back in the system. This will cause your misfire. Go-to a trusted mechanic and have them check out your EGR system.

Jun 12, 2017 | 1998 Honda Civic

1 Answer

I have a check engine alarm on my '96 honda civic ex and diagnostics result in code p0138. What does this mean?


The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)
There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.
A code P0138 may mean that one or more of the following has happened:
  • Faulty O2 sensor
  • Short to battery voltage in O2 sensor signal circuit
  • High fuel pressure (not as likely)
Here are some potential solutions:
  • Replace O2 sensor
  • Repair short to battery voltage in o2 sensor signal circuit

Feb 10, 2011 | 1996 Honda Civic

1 Answer

Have a 2002 Honda Civic Hybrid with 192,000 miles. Only issue I have had to this point is the catalytic converter has ben replaced 3 times, all under warranty. My check engine & IMA lights popped on...


What type of Honda Civic do you have? There is a difference between the LX and EX civic exhaust systems. And your vehicle will not pass inspection with your check engine light on.

Jan 06, 2011 | 2002 Honda Civic

1 Answer

I have a engine light Code P 0420, please tell me how to fix this & what is this. Its 2000 Honda Civic Ex $ door Sedan


Your Honda is probably very high on mileage. The P0420 code indicates that the catalyst system is operating below the efficiency threshold. In English, your sensors are telling your ECU that the catalyst in the catalytic converter is worn out. A new catalytic converter is going to be big $$$.

It is not going to disable your car, but if you live in a state requiring emission testing to pass inspection, your car will probably not pass the next inspection.

You can get a code reader (the Actron CP9575 or CP9175; both work well for less than $150.00 USD) from most auto parts stores or Sears and try clearing the code. In all liklihood, clearing the code this way will not fix the problem and the CEL will illuminate again.

Jul 21, 2010 | 2000 Honda Civic

1 Answer

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bad o2 sensor or clogged catalytic converter, several items

Sep 24, 2009 | 1993 Honda Accord

1 Answer

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I am sorry to bum you guys out, but this usually means the piston in the torque converter is bad. The converter needs to be replaced along with a transmission flush.

Jul 26, 2008 | 2009 Honda Civic

2 Answers

1996 honda civic emssions failure


If you failed you should know if it is HC, NOx, or CO. Posting that will make it much easier to diagnose.

Jun 14, 2008 | 1996 Honda Civic

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