Hi friends anyone can help me..My car Xc60 years 2015 have popped up with 'Engine performance reduced 'turtle symbol'. This problem is happening to me almost 4 times. Normally the problem has happened to me while driving 20 to 30 km/hour during morning or cold weather.. If the turtle symbols are pop up my car will automatically will shut off the engine.. It's really dangerous and always make me panic on that situation, then if I try to start the engine again, the engine will crank and cannot be started.. After trying to start 10 or 15 minutes, then only the engine will start again..I have brought my car to local Volvo dealer. First time 1. The dealer changed the fuel pump, Second time 2. The dealer changed oxygen sensor , Third time 3. The dealer changed battery and spark plug, Fourth time 4. The dealer clean manifold But I feel very sad until now the same problem still appear in my car again.

 

I have a very similar problem , with this REP (reduced engine performance) .. But mine never stalls, only limits the RPMs to 1500 - rather dangerous.
Your dealer ''service" is, IMO, worthless. .

Return a fifth time and they may replace the spare tire !

I'd look into the connections at the throttle body - corrosion is real and a problem ... BUT, your ride is but 4 years old ..scratch the corrosion .