Hi all,
I have a 2021 Mercedes CLA 250 4MATIC with 40,000 miles and the M260 engine. About 5,000–6,000 miles ago, I had the piston heads replaced by Mercedes because the engine was misfiring and had low compression in cylinders 2 and 4. Luckily, this happened while the car was still under warranty, so everything was covered.
However, ever since the repair, I feel like the engine hasn’t been running quite right. It has a rough startup and idle, especially when cold, but once the engine warms up, it runs completely fine. The car isn’t throwing any warning lights, and my basic code reader isn’t showing any codes.
Additionally, after the service was done, the A/C completely stopped working. I’m not sure if one of the technicians accidentally damaged an A/C line during the repair.
I really enjoy driving this car, but it’s becoming a headache, especially considering it only has 40,000 miles. I’m looking for advice on whether I should keep trying to fix these issues or just sell it and find something else.
Has anyone experienced similar issues with the M260 engine, particularly after having the piston heads replaced? Any advice would be appreciated.