2001-05 Honda Civic Exhaust Pipe with Catalytic Converter - 1ACCD00320

Warranty & Shipping
How-To & Tools
Product Reviews
Vehicle Fit


  • Brand New Front Pipe with Catalytic Converter
  • Correct for both federal EPA and California emissions equipped vehicles
  • Direct fit
  • Gaskets included

Item Condition: New

5 Year Warranty

This item is backed by a 5 Year Warranty. In the event this item should fail during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. 

Emissions Note:

Due to state emissions regulations, we cannot ship this item to the state of California as it is not C.A.R.B ( California Air Research Board) approved for use in this state.

Due to New York state emissions regulations, this item cannot be installed on a California emissions equipped vehicle in the state of New York.

Due to Maine state emissions regulations, this item cannot be sold for or installed on a California emissions equipped vehicle of the model year 2001 or newer in the state of Maine.

All emissions information for a vehicle can be found on a tag under the hood. If the tag is missing, you can contact a dealership with your VIN to determine which emissions system your vehicle is equipped with.

  1. step : Removing the O2 Sensors (1:01)
    • Loosen the rear O2 sensor with an O2 sensor socket or 22mm wrench
    • Twist the O2 sensor off by hand
    • Allow the sensor to hang
    • Loosen the front O2 sensor with an O2 sensor socket or 22mm wrench
    • Unclip the O2 sensor wiring harness from its keeper
    • Twist the O2 sensor off by hand
    • Allow the sensor to hang
  2. step : Removing the Catalytic Converter (2:57)
    • Apply rust penetrant to the 12mm bolts on the exhaust manifold flange
    • Remove the two 12mm bolts from the exhaust manifold flange
    • If the bolts are corroded, use a hammer to tap on an 11mm socket
    • Support the tail pipe with a bungee cord
    • Remove the three 13mm bolts from the tail pipe flange
    • Allow the front of the catalytic converter to hang
    • Pull the catalytic converter off its rubber bushing
  3. step : Installing the Catalytic Converter (7:03)
    • Remove the plugs from the two O2 sensor bungs with an 8mm Allen wrench
    • Hang the catalytic converter from the rubber bushing
    • Insert the exhaust gasket into the exhaust manifold with the thinner side at the bottom
    • Lift the catalytic converter to meet the exhaust manifold
    • Start the two 14mm bolts into the exhaust manifold flange
    • Insert the gasket into the rear of the catalytic converter
    • Insert the three 13mm bolts into the tail pipe flange
    • Remove the bungee cord
    • Tighten the two 14mm bolts in the exhaust manifold flange
  4. step : Installing the O2 Sensors (8:51)
    • Start the front O2 sensor by hand
    • Tighten the front O2 sensor with an O2 sensor socket or 22mm wrench
    • Clip the O2 sensor wire into its keeper
    • Start the rear O2 sensor by hand
    • Tighten the rear O2 sensor with an O2 sensor socket or 22mm wrench
    • Run your car and listen for exhaust leaks
    • Clear your ECU code or have a shop do so if necessary

Tools needed for replacement:

    Allen Wrenches

  • 8mm Allen Wrench

  • General Tools

  • Hammer

  • Materials, Fluids, and Supplies

  • Bungee Cord

  • Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Sockets - Metric

  • 11mm Socket
  • 14mm Socket
  • 12mm Socket
  • 13mm Socket

  • Specialty Tools

  • O2 Sensor Socket

  • Wrenches - Metric

  • 22mm Wrench
  • 13mm Wrench

4.83/ 5.0
6 reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
OE fitment and great product
This fit just like stock and included all hardware needed. Great product and would recommend to anyone!
February 26, 2017
Good Stuff!!!
Great direct replacement part for my 2003 Honda Civic. Though, I did have to buy new bolts and nuts for the end that connects to exhaust, manifold spring bolts where included. The original bolts was welded on the old cat-converter. Picked those items at my local auto store. No big deal, preferred new ones anyway. The instructional vid 1A Auto produced is awesome. That vid prompted me to purchase this part and do-it-myself. My only suggestion to 1A Auto would be to included to the 3" each nuts and bolts for the exhaust end. :)
July 10, 2017
02 Civic catalytic converter
Showed up pretty quickly fit in without trouble $100 cheaper than what the garage wanted to charge and they put it in anyway
February 15, 2018
Perfect Fit Replacement
$100 cheaper than anything else I could find. This is a true direct replacement. Installation was easy and the fit was perfect. You will probably need to replace the three bolt in the rear flange, but this item does not include these (my three bolts were so rusted that two had to be cut off and the third wasnt worth reusing). The front (manifold) bolts were included.
February 24, 2018
Perfect fit!
The part arrived very quickly and with free shipping. The part fit great and was much cheaper than what other places were charging. The gasket didn’t fit, but it was only $7 to get the right one from a local auto shop. I will definitely buy from 1A Auto in the future if I need car parts.
October 3, 2018
Good quality, good price, thanks
I would highly recommend this catalytic converter. It was a direct bolt on replacement for my 01 Honda Civic and fit perfectly. No problems, no modifications. Fixed my check engine light emissions code that wouldnt go away. Price was reasonable and shipping was quick. A well made product that functions as it should.
November 19, 2018
Will this fit my car? Add a vehicle to make sure
Customer Q&A
Ask a question to 1A Auto customers who purchased the product
Will this part fit on a 2002 Honda Civic Si 1.7l?
Harrison B August 11, 2018
Hello, This part is listed to fit 2001-2005 Honda Civic EX model only. Thank you!
Adam G August 11, 2018
Why does the description say its C.A.R.B legal for California but in the warranty and emissions section it says its not?
Antonio S November 18, 2018
The parts are unable to be shipped to California or New York due to having different emission standards.
Emma F November 18, 2018
Year Make Model Description
2001-2005Honda Civic Honda Civic EX Front Exhaust Pipe with Catalytic Converter L4 1.7L
Part #: 1ACCD00320

Order must be placed by 4pm ET
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Estimated Arrival Cost

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Get it in: 2 - 4 Business Days

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How-to Video:

(10:17 min)