The Porsche 993, particularly the 1996 model year, can present unique challenges when it comes to achieving OBDII readiness for California smog checks. This article outlines a successful experience navigating this process, offering insights for 993 owners facing similar hurdles.
Overcoming OBDII Readiness Challenges
After relocating a 1996 Porsche 993 from Oregon to California, the vehicle, initially equipped with cat bypass pipes, required reinstallation of the catalytic converter and post-cat O2 sensors. Despite replacing the O2 sensors with Bosch generics and clearing the MIL/CEL after a battery disconnect, the OBDII readiness indicators for non-continuously monitored systems remained incomplete.
Extensive driving, exceeding 300 miles under various conditions, failed to set the readiness codes. Consultations with fellow Porsche enthusiasts suggested seeking assistance from a California Smog Referee.
The Smog Referee Solution
Contacting the Bureau of Automotive Repair (BAR) yielded a prompt appointment with a Smog Referee for a nominal fee. Although the typical procedure involves failing a smog test prior to seeking a referee, the referee proceeded with an extensive inspection, lasting approximately an hour.
Surprisingly, the vehicle passed the emissions tests with exceptionally clean results. However, the functional check and air injection (SAI) system resulted in a failure. The certificate ultimately stated: “The vehicle failed the MIL/CEL test due to failure to successfully complete all OBD self tests.”
The referee, acknowledging the 993’s OBDII readiness issues not yet documented in the BAR database, issued a passing smog certificate. He expressed frustration with the BAR’s lack of awareness regarding this specific problem.
Future Smog Check Strategy and Implications
This experience suggests a simplified approach for future biennial smog checks. Instead of attempting to complete the often elusive drive cycle, the plan is to intentionally fail a standard smog test and then schedule an appointment with a Smog Referee.
This approach might also apply to vehicles with genuine SAI issues, provided no pending DTCs are stored. Theoretically, disconnecting the battery to clear codes, failing a smog test, and then consulting a referee (without exceeding 100 miles or further battery disconnects) could potentially lead to a passing certificate. However, this is purely hypothetical and should not be interpreted as encouragement to circumvent emissions regulations. Disclaimer: This anecdotal account is for informational purposes only and does not constitute legal or mechanical advice. Always consult with qualified professionals for vehicle maintenance and compliance with applicable regulations.
