OBD Catalyst Verification Guide for Pre-OBD II Vehicles

Ensuring your vehicle’s catalytic converter is compliant with environmental regulations is crucial, especially for pre-OBD II models. This guide provides a comprehensive list to verify the correct application of aftermarket catalytic converters on pre-OBD II vehicles. By comparing the Executive Order (EO) number stamped on the catalytic converter against this list, you can confirm its compliance.

This verification process is essential for pre-OBD II vehicles, which predate the standardized On-Board Diagnostics II (OBD II) systems. These older vehicles still need to meet specific emissions standards, and catalytic converters play a vital role in achieving this. Using the correct, CARB-approved (California Air Resources Board) catalytic converter is not just about passing inspections; it’s about contributing to cleaner air and adhering to environmental laws.

The Executive Order number on the catalytic converter is your key to verification. Each EO number corresponds to a specific series, vehicle category, and manufacturer. To use this list effectively, locate the EO number on your catalytic converter and match it with the information provided below. If the EO number aligns with your vehicle category, the catalytic converter application is correct.

Here’s a breakdown of the vehicle categories to help you identify yours:

• PC-1: Pre-OBD II passenger cars with a single catalytic converter per exhaust bank. This category generally includes vehicles with inline engines or single exhaust systems.
• PC-2: Pre-OBD II passenger cars equipped with more than one catalytic converter per exhaust bank. This often applies to V-type engines (V6, V8) with dual exhaust systems, where each bank of cylinders has its own catalytic converter(s).
• T-1: Trucks with one catalytic converter per exhaust bank. Similar to PC-1, but for trucks. This category typically covers trucks with inline engines or single exhaust configurations.
• T-2: Trucks with more than one catalytic converter per exhaust bank. Analogous to PC-2, but for trucks. This usually pertains to trucks with V-type engines and dual exhaust systems.

Below is the verification list. Ensure you cross-reference the Executive Order number on your Obd Catalyst with the category that matches your vehicle type.

Inspection Alert

Important Note Regarding Catalytic Converters from International Muffler Company (Cherry Bomb/Maremont):

Please be aware of a labeling issue affecting catalytic converters manufactured by International Muffler Company, operating under the names Cherry Bomb and Maremont. Due to a production labeling process anomaly, some catalytic converters may have an extra zero appended to their Executive Order (E.O.) number on the label.

Specifically, when the CARB issued E.O. number concludes with a single digit, the label might incorrectly display it as D-560-0X instead of D-560-X. This issue impacts the following Executive Orders: D-560-3, D-560-5, D-560-6, D-560-7, and D-560-8. Consequently, these EOs might be found on the converter labeled as D-560-03, D-560-05, D-560-06, D-560-07, and D-560-08, respectively.

International Muffler Company is actively addressing this labeling process to eliminate the extra zero from future labels.

It’s crucial to understand that this labeling discrepancy does not compromise the performance or compliance of these catalytic converters. During a Smog Check inspection, this labeling irregularity should not cause the catalytic converters to be deemed non-compliant or illegal.

When verifying these specific E.O.s in the CARB database, it is imperative not to include the extra “0” when inputting the E.O. number. Instead, enter the correct, regular E.O. number (e.g., D-560-3, D-560-5, D-560-6, D-560-7, or D-560-8) to accurately access the corresponding Executive Order details within the database.

By using this guide and being mindful of the inspection alert, you can confidently verify the obd catalyst compliance of aftermarket catalytic converters for pre-OBD II vehicles, ensuring both environmental responsibility and regulatory adherence.