SES light when removing rear 02's

When adding Lt's I know you need to either run o2 SIMS or use software to delete the rear o2's.
If you don't this will tirgger an SES Light.
If you don't do either of the above and still remove the o2's and trigger the SES light will this affect performance at all? What would be the negatives to doing this?
But, if the light is always on, you will not know when you get a real code unless you are scanning all the time.
If you are interested in a tuning suite, there is none better than www.efilive.com
I don't have to worry about ODII here in the UK and lets face it engines of the past didn't have SES lights and survived ok.
This would just be a stop gap until I sort out a cam and I'll get EFI Live then, but for know I'm wanting to keep the ££££ down.




