I had this code pop up about a year or so ago and replaced all 4 O2 sensors after all had some whacky readings upon testing; car went for 8k without the code coming back. Had the code pop up again about a few weeks ago, cleared it and it’s been about 500-600 miles without it returning. As far as smells I’ve only smelt that strange sulfur smell once but upon flooring it any other time seems fine. I’m over dealing with it at this point and came across RV6’s HFPC’s which seem to be widely recommended here and a more cost effective option than trying to source OEMs. Everyone runs diff exhaust setups it seems and upon searching I haven’t found anyone that’s had a stock exhaust setup with just the HFPCs. I’m not trying to make any serious gains with this car HP wise as it’s just my daily with minor modifications, my main concern is ensuring this wouldn’t add any unnecessary rasp on a stock setup and how much of a PITA this install will be. Thanks in advance for any assistance.

 

If all you want is the cat efficiency code to clear, you can run o2 extensions on the downstream o2 sensor. Hfpcs and pcds usually come with extensions.

 

What brand O2 sensors did you buy?

 

Takes look at these Pro-Cats I just posted in the marketplace.
14HP/TQ for $300. Best bang for the buck of any mod. No drone or sulfur smell like cat deletes and no check engine lights with OEM O2 sensors. Passes emissions sniffer too.