Im new to this forum so be kind hahaha.
I have a 2006 fiat stilo 1.6 16v. She has a CEL with a trouble code P0141.
I have symptoms:
Slight decrease in fuel economy
Rough engine idle which started out first eventually followed by…
Underperforming engine low power.
Not in limp mode
CAT removed by previous owner.
I read a thread on here from years ago about a downstream o2 sensor.
When the air outside is really cold like early morning winter days then she accelerates better but in normal condition she has a sluggish acceleration.
I replaced spark plugs and fuel pump.
I fitted a K&N cone air filter because of air box falling out and cracking while reversing out my garage. Can’t get a box filter for her in my country anymore.
However she never drove sluggish after fitting the cone. It was some few months after that she started to give acceleration symptoms. Rough idle was present during box filter use already. New Fuel pump made it idle better. Before it would switch off at times .
Thanks in advance