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WALKER® EXHAUST SYSTEMS: EPA Converter Basics
Additional EPA converter information: EPA installation requirements, selecting a universal catalytic converter , and Engine Family Number (EFN) location.



WALKER® EXHAUST SYSTEMS: Certification - EPA
CATALYTIC CONVERTER INSTALLATION GUIDE ATTENTION: PROFESSIONAL INSTALLERS

In August, 1986 the U.S. Environmental Protection Agency (EPA) issued new proposed guidelines for the construction, efficiency and installation of aftermarket converters. The EPA guidelines state that replacement converters may be installed only in the following situations:
  1. The vehicle is missing a converter.
  2. A state or local inspection program has determined that the existing converter needs replacement.
  3. The vehicle a 1995 or newer model that is more than eight years old or has more than 80,000 miles on it, and a legitimate need for replacement has been established and documented.

The installer must include the customer's name and address, the make, model, year and mileage of the vehicle on the service invoice, along with a stated reason for replacement. Where a state or local government has determined that a converter is damaged or needs replacement, the service or repair facility must retain a copy of the written statement or invoice. Where a proper state or local government representative has not been verified the replacement need, the customer and a representative of the service or repair facility must sign a statement verifying that replacement is justified.

That statement is printed on the following sheet which is included in every converter carton:

-IMPORTANT-

THE U.S. ENVIRONMENTAL PROTECTION AGENCY REQUIRES THAT THE FOLLOWING STATEMENT BE READ AND SIGNED BY THE VEHICLE'S OWNER AND THE INSTALLER OF THE REPLACEMENT CATALYTIC CONVERTER.

Catalytic converters are emission control devices which are designed to last the life of the vehicle and do not normally require replacement. Furthermore, if the vehicle is properly used and maintained, original converters are covered by the emissions control warranty for eight years or 80,000 miles. Federal law prohibits repair businesses from replacing these devices except under certain limited circumstances.

In order to verify that the proper circumstances exist, the owner of the vehicle on which such repairs are made and a facility representative must sign the following statement.

The vehicle is a 1994 or older model and has more than 50,000 miles on it, or is a 1995 or newer model which is eight years old or has more than 80,000 miles on it, and the catalytic converter required replacement because .............................. or the vehicle's catalytic converter was missing when the vehicle arrived.

Vehicle Owner's Signature ..............................

Facility Representative's Signature ..............................

Date ..............................

The installer must retain this statement and a copy of the invoice for six months and the replaced converter (if any) for at least for 15 days from the date of installation of the replacement converter. The replaced converter must be marked in such a way that it can be identified with the customer invoice and this statement and be available for EPA inspections.


Furthermore, the EPA has issued the following installation requirements:
  1. The converter be installed in one of the three situations outlined above.
  2. The converter be installed in the same location as the original converter.
  3. The converter be the same type as the original converter (i.e., oxidation, three-way or three-way plus oxidation).
  4. The converter be the proper one for the vehicle application as determined and specified by the manufacturer.
  5. The converter be connected properly to any existing air injection components on the vehicle.
  6. The converter be installed with any other required converter for a particular application.
  7. The converter be accompanied by a warranty information card to filled in by the installer.
  8. Federal law prohibits removal or replacement of properly functioning OE catalytic converter.


WALKER® EXHAUST SYSTEMS: Engine Family Number
IMPORTANT — ENGINE FAMILY NUMBER

To determine which catalytic converter to use on a vehicle, it is necessary to determine the specific vehicle emission system that was installed by the Original Equipment Manufacturer. This information is included on the Vehicle Emission Control Information label required by the United States Environmental Protection Agency (see examples below). This label is located in the engine compartment in a visible position on the hood underside, strut tower, radiator support, fan shroud, or firewall. The label will provide the Emission Family Number (EFN, also known as the Engine Family code or Test Group Number) and other important emission specifications. All applications in this catalog refer to the EFN. Be sure to verify your EFN in order to avoid misapplication of the catalytic converters in this catalog. If the label is missing, it is necessary to contact the OE dealer for the information, or to order a new Emission Control Information Label.
WALKER® EXHAUST SYSTEMS: Engine Family Number

WALKER® EXHAUST SYSTEMS: How to Find a Universal Converter
HOW TO FIND A UNIVERSAL CONVERTER IF NOT LISTED IN APPLICATION SECTION

IMPORTANT: If the vehicle is registered in the state of California, the catalytic converter must be selected from the California converter catalog.

Note: All vehicles that are NOT registered in the state of California may use this catalog to select a catalytic converter. This includes California Emission vehicles that are registered in states other than California. This also includes vehicles registered in Canada.

If you do not find your vehicle listed in the application section of this catalog, you may select a universal converter to repair your vehicle by following these steps. Universal converters require custom fabrication to fit them into the exhaust system. This type of work requires higher than average skills and is not recommended as a "Do it yourself" repair for most consumers.

Step 1: Determine required body size.

Step 2: Determine the pipe size required

Step 3: Determine any additional features required such as oxygen sensor fittings, dual inlet pipes, etc.

Step 4: Determine whether a standard converter or Ultra converter is required. Standard converters are recommended for 1995 and older vehicles that are in good working order. Ultra converters are recommended for OBDII vehicles (1996 and newer models), or non-EGR vehicles with excessive NOx.

Step 5: Choose a converter rated for your engine size. Engine displacements listed for universal converters are the maximum allowed engine size for the converter. The vehicle must have the same size engine or a smaller engine than the engine size listed for the universal converter.

Step 6: Choose a converter rated for your vehicle weight. Look at the manufacturer's label on the driver's side door pillar to find the vehicle's Gross Vehicle Weight Rating (G.V.W.R.). The vehicle must have the same G.V.W.R. or smaller than the G.V.W.R. listed for the converter.

Step 7: Choose the appropriate converter Type. Vehicles have catalytic converters that operate as either Three-Way, Three-Way plus Oxidation, or Oxidation types. Look at the emission label in the engine compartment of the vehicle to determine what type of converters are used. Most universal converters have been designed to work in place of multiple types of catalysts. The chart below shows common abbreviations of catalyst types shown on the vehicle emission label:

Catalyst Type Oxidation Three-Way Three-Way plus Oxidation
Abbreviations COC
OC
OX
OXD
CAT
TWC
3CL
3WY
TWC+OC
TWC+OX
(note: All Three-Way plus Oxidation converters will have an air tube, and any converter with an air tube is a Three-Way plus Oxidation converter.)

WALKER® EXHAUST SYSTEMS: How to Find a Universal Converter