Check engine light on (steady)

[spirlet]

Since fewdays, I had a hole on my exaust pipe (connection between central and end pipe).Yesterday evening, I’ve clogged the hole with special mastic (gum gun). Thismorning no problem when I go for works (first heating). But when I start engine to come home, I’vedirectly the check engine light on (steady)!
During thejourney, I have some stutters (not hard and not constant) and engine stays high when no speed engaged.

Any Idea whatappend? Any idea what can I do?
Thanks a lot.

here is a picture of part before the mastic application:

[Daox]

What is the check engine light code?

[spirlet]

What is the check engine light code?

I'don't know about code.

but situation return to normal.

Action:

With motor at hot temperature: mad multiple heavy accelerations on road.

After a while, motor return to normal functioning (residue of gun gum inside snoring or impurities inside catalytic ,...) ?

Thanks for your help.