I can’t believe some of you guys. The experts , the best of the best, say to leave the 02 plugged in.

Nick, it is about experience and maintenance..if you go to the shop they have to tell you leave it in because of the policy and regulation.Nothing wrong with that...kapito.? but most of the people who drive 911 and have not a garage queens, take the CAT off and do not use oxy sensor ..that is how it is....nothing to fight about;-)))))))))))

Ivan

I think there is actually no universal answer - my take is:

1) If you have a bone-stock car, it may run well without the O2 sensor; some seem to do well with this approach.

2) If the car is chipped or otherwise modified in a way that is not specifically set up to deal with the absence of the sensor, it may not run well without the O2 sensor (this was my case - it ran rich with a chip and no sensor). The sensors are generally required for optimized performance in modern EFI systems.

5 Years ago I had some preventative work done on my car which included replacing the original catalytic converter with a M&K Euro pre-muffler. The independent shop who works on many air cooled Porsches suggested leaving the O2 sensor disconnected. They explained that since the Motronic system in our 3.2's is a relatively simple system where you set the base idle and mixture and it runs predetermined fuel enrichment curves based on speed, load, OAT, etc.... I could run the car a little richer which would be good for power, throttle response, and cooler engine temps, etc...With the Euro pre-muffler there was no issue with the richer mixture fouling the catalytic converter. Where I live there is no emissions testing. The car is otherwise stock with the factory chip. It runs excellent with the O2 sensor disconnected.

You are still wrong .

Nick chill out ..i am man enough to say i was wrong on the non Cat in other countries ..the rest i leave as i said;-)

Ivan

A cleaner, better afr, running engine can’t be worse for it.

John Walker unplugged my O2 sensor, adjusted the mixture, and it's run great ever since. That was 2016. '84 911.

Why not leave it plugged in and don’t adjust the mixture?

Nick, it does not work that way ;-) i hope you got your answer from above post...

Ivan