The OBD2 code PO 458 on a 2007 BMW 550i often indicates a problem with the Evaporative Emission Control System (EVAP). While this code doesn’t directly relate to the catalytic converter, understanding catalytic converter compliance is crucial for passing emissions tests. This article provides a comprehensive guide to verifying the correct catalytic converter for pre-OBD II vehicles, using Executive Order (EO) numbers. This information may be helpful for those troubleshooting emissions issues on older vehicles, or for those who may have inadvertently installed an incorrect catalytic converter on their 2007 BMW 550i.
Understanding Executive Order Numbers for Catalytic Converters
California’s Air Resources Board (CARB) uses Executive Order (EO) numbers to certify aftermarket catalytic converters. Each EO corresponds to specific vehicle categories and ensures the converter meets emission standards. Verifying the EO number on your catalytic converter is essential for compliance.
Vehicle Categories and EO Numbers
Before checking the EO number, identify your vehicle category:
- PC-1: Passenger cars with one catalytic converter per exhaust bank (pre-OBD II).
- PC-2: Passenger cars with more than one catalytic converter per exhaust bank (pre-OBD II).
- T-1: Trucks with one catalytic converter per exhaust bank (pre-OBD II).
- T-2: Trucks with more than one catalytic converter per exhaust bank (pre-OBD II).
The table below lists EO numbers, corresponding vehicle categories, manufacturers, and contact information. Compare the EO number stamped on your catalytic converter to this list. A match confirms correct application.
| Executive Order | Series | Category | Manufacturer |
|---|---|---|---|
| D-182-37 | 80600/80700 | T-2 | Walker (DBA Tenneco) |
| D-193-84 | 37000/38000 | PC-2 | Car Sound (DBA Magnaflow) |
Important Note: International Muffler Company Labeling Issue
International Muffler Company (Cherry Bomb/Maremont) had a labeling issue where an extra zero was added to some EO numbers. Affected EOs end in a single digit and appear as D-560-0X instead of D-560-X.
This does not affect the converter’s performance or legality. When verifying these EOs in the CARB database, omit the extra zero. For instance, use D-560-6 instead of D-560-06.
Conclusion: Ensuring Catalytic Converter Compliance
Verifying your catalytic converter’s EO number is crucial for emissions compliance, especially for pre-OBD II vehicles. While a PO 458 code on a 2007 BMW 550i relates to the EVAP system, understanding catalytic converter compliance is vital for overall vehicle health and passing smog checks. Using this guide and the CARB database, you can ensure your vehicle has the correct catalytic converter. Remember to check for the labeling irregularity with International Muffler Company converters.
