O2 Sensor Check Engine Light Fix Large O2 Bung O2 Sensor Check Engine Light Fix 90 Degree Bung Description O2 Sensor Check Engine Light Fix As you can see on the above pictures how these O2 Bungs install its a fairly simple process but you have to make sure you have enough clearance to use them. Our pictures show them installed on a Porsche 981 and Porsche 987.1 , please refer to pictures for measurements.  We have tested these for a while and these have worked very well on our test cars, our 981 has not seen a check engine light on a 1 year testing phase  (as of end of June 2017). We suspect that these will be just as efficient on 991's as well.  Please keep in mind that there is no guarantee that these will be 100% effective as per our testing they are however we haven't tested these on all Porsche's out there. You must understand and accept that there is a possibility of a check engine light. We don't accept any returns if they have been installed.  Important disclaimer These O2 Sensor fix are not street legal and should be used on off road vehicles, racing vehicles or for testing purposes only, these are not street legal. Images sell! Get Supersized Images & Free Image HostingCreate your brand with Auctiva's Customizable Templates. Attention Sellers - Get Templates Image Hosting, Scheduling at Auctiva.com. Track Page Views WithAuctiva's FREE Counter