2015 C300 4Matic Struggling to Accelerate.
Thread Starter
Newbie
Joined: May 2024
Posts: 2
Likes: 0
C300
2015 C300 4Matic Struggling to Accelerate.
Hello everyone, I have a 2015 C300 4 Matic.. A few days ago the check engine light came on throwing the code p052e71, My mechanic told me it was the crankcase ventilation valve that needed to be replaced and that I should also change the thermostat as well. I had him change both those parts, I got the car back but I noticed the acceleration is extremely slow. Before the parts were changed the car would get up and go fast there was no delay or anything. Now when i hit the gas the RPMS are going up to 5000 before I feel any substantial movement and the car feels sluggish, Comfort, Sport and Sports Plus all feel the same. Its doesn't feel like turbo lag cause there is no sudden burst of speed. I contacted the mechanic but he's saying if there is no check engine light he can't do anything and i should see if the light comes on first before I bring it to him. If anyone has any advice please let me know. Thanks.
Out Of Control!!
Joined: Apr 2019
Posts: 11,921
Likes: 6,769
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
sluggish 4Cyl. turbo...
Kev, you went to the wrong shop. Nearly anyone can hang cheap parts... troubleshooting is what you need.
CEL are extreme fault conditions... your case is only halfway there without active light.
Someone you or technician needs to read the chassis computers to help come up with a matching course of actions.
The list of suspects for reduced power is pretty wide... wastegate filled with oil or some intake parts that were disturbed during PCV replacement.
CEL are extreme fault conditions... your case is only halfway there without active light.
Someone you or technician needs to read the chassis computers to help come up with a matching course of actions.
The list of suspects for reduced power is pretty wide... wastegate filled with oil or some intake parts that were disturbed during PCV replacement.
Last edited by CaliBenzDriver; May 5, 2024 at 10:55 PM.
