
I’ve had my s80 T6, 2003 for a bit over a year now, and i’ve had several problems with it...
But this problem i’ll need some help with.
Car revs up to 1500 for a few seconds after start, then drops down to normal.
When driving on higher revs, kick-down, it doesn’t give full power and starts to hesitate and lag(?) until it gears down to normal revs again.
I’ve changed spark plugs, ignition coils, air filter, and vacuum hoses to the TCV.
Also, there’s only one code, P0420, but i don’t think it’s connected to my rev issue