P0299 Fixed!
Thread Starter
Newbie
Joined: Oct 2023
Posts: 2
Likes: 2
C300 W205
P0299 Fixed!
Check Engine Light came on. Loss of power over 60 mph and limp mode if I pushed it. Replaced the wastegate and voila! Problem solved. Mechanic quoted $650. I did it myself in an hour for cost of this product ($50 bucks) Check engine light cycled off by itself, after about 10 cycles. Wastegate / Turbo Actuator. Some mechanics will see the p0299 code and assume it’s the turbo and charge $8k to fix it. Always try the $50 dollar Wastegate first (Easy DIY). Got mine on Amazon.
Out Of Control!!
Joined: Apr 2019
Posts: 12,063
Likes: 6,857
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
G R E A T ! !
Check Engine Light came on. Loss of power over 60 mph and limp mode if I pushed it. Replaced the wastegate and voila! Problem solved. Mechanic quoted $650. I did it myself in an hour for cost of this product ($50 bucks) Check engine light cycled off by itself, after about 10 cycles. Wastegate / Turbo Actuator. Some mechanics will see the p0299 code and assume it’s the turbo and charge $8k to fix it. Always try the $50 dollar Wastegate first (Easy DIY). Got mine on Amazon.
They only change the whole turbo because its faster than the whole engine... LOL for a $50 part!
Newbie
Joined: Jun 2024
Posts: 1
Likes: 0
benz glc 300 4 matci 2019
Hello,
I believe I have the same issue. But I cannot find any videos online on how to replace the westgate? Are you able to send me a link to any videos or tutorials that you found on how to replace the westgate? Any help would be greatly appreciated. Thanks in advance.
I believe I have the same issue. But I cannot find any videos online on how to replace the westgate? Are you able to send me a link to any videos or tutorials that you found on how to replace the westgate? Any help would be greatly appreciated. Thanks in advance.
Member
Joined: Sep 2016
Posts: 81
Likes: 5
C300
Check Engine Light came on. Loss of power over 60 mph and limp mode if I pushed it. Replaced the wastegate and voila! Problem solved. Mechanic quoted $650. I did it myself in an hour for cost of this product ($50 bucks) Check engine light cycled off by itself, after about 10 cycles. Wastegate / Turbo Actuator. Some mechanics will see the p0299 code and assume it’s the turbo and charge $8k to fix it. Always try the $50 dollar Wastegate first (Easy DIY). Got mine on Amazon.
Junior Member
Joined: Aug 2019
Posts: 19
Likes: 2
From: Norway
2015 W205 S205
Funny how we all run past each other with the same issue😂
This forum is absolutely a tool!
Got this DTC P0299(21) on my car, after noticing loss of power under accelartion. Felt like limp mode, but No Check engine light. (At highway)
Plugged in the OBD reader and got this code.
next: google it, found this forum and went to my mechanic.
At first we checked with a manually pressure pump, and yet he said the Waste gate was fine. (I was not convinced)
We then plugged in Autel OBD reader, and open/closed the waste gate actuator through the machine and notice the flap did not hold back as it should when it was «on».
It had a small release when it should have held the flap closed for the vacum.
Going to Mercedes tomorrow and ask if they can order the Waste gate acutator. Heard that they dont sell it without the Turbo…
If not then Ebay will be the solution, and hopefully it will go back to normal after the change!🤞
BTW! Could someone break down the issue why this happens? And how the actuator works (not sure what i wrote is correct) please educate me
And the possibilty of other parts that i may need to change if this not work…? 🤓
Found what @JettaRed wrote in another thread:
‘’ By default, the wastegate actuator is normally held closed by a spring. The boost pressure line opens the wastegate when there is excessive boost. However, if the actuator spring has weakned, the wastegate may open sooner, resulting in an underboost condition’’
(Dont know how to tag another user)😅
2015 C180, 156hp
This forum is absolutely a tool!
Got this DTC P0299(21) on my car, after noticing loss of power under accelartion. Felt like limp mode, but No Check engine light. (At highway)
Plugged in the OBD reader and got this code.
next: google it, found this forum and went to my mechanic.
At first we checked with a manually pressure pump, and yet he said the Waste gate was fine. (I was not convinced)
We then plugged in Autel OBD reader, and open/closed the waste gate actuator through the machine and notice the flap did not hold back as it should when it was «on».
It had a small release when it should have held the flap closed for the vacum.
Going to Mercedes tomorrow and ask if they can order the Waste gate acutator. Heard that they dont sell it without the Turbo…
If not then Ebay will be the solution, and hopefully it will go back to normal after the change!🤞
BTW! Could someone break down the issue why this happens? And how the actuator works (not sure what i wrote is correct) please educate me
And the possibilty of other parts that i may need to change if this not work…? 🤓
Found what @JettaRed wrote in another thread:
‘’ By default, the wastegate actuator is normally held closed by a spring. The boost pressure line opens the wastegate when there is excessive boost. However, if the actuator spring has weakned, the wastegate may open sooner, resulting in an underboost condition’’
(Dont know how to tag another user)😅
2015 C180, 156hp
Last edited by Johnnyb3good; Mar 9, 2025 at 05:20 PM.
