Emissions light following backbox!???

[savio_v6]

Hi all new to the forum.

A bit of history...main cat broke last year at only 50,000miles, replaced with a 100cell cat. Turned out the coilpack recall was not done so got that done soon after.
After seeking some more power (car has stage 1 map) I deleted the precat which through an emissions light. Sorted with spacer on O2 sensor 2.

Recently i replaced the stock backbox and later that day (while cruising) emissions light on. Keeps returning code P2196.

I have dash command and it showing the lambda signal a bit rich 0.90s on idle.

Do I need a new O2 sensor? Would like to know before I get ripped off at a garage.


Thanks in advance.

 

[savio_v6]

Apologies. Car is 2006 a3 2.0tfsi BWA

 

[phil76]

Why did you need the 02 sensor spacer sorry as couldn't understand what you had put, I have never known any one getting an EML light with knocking out the pre-cat.

 

[savio_v6]

Maybe because of the sport cat 100cell combined with the pre cat delete it through the emissions light. Without checking the code a friend told me I need a spacer on sensor 2. And since then it hasn't come back until the recent backbox change.