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Code P0299? Under boost

Tiny
JOEN31
  • MEMBER
  • 2018 VAUXHALL ZAFIRA
  • 1.4L
  • MANUAL
  • 72,000 MILES
I have a p0299 code under boost but have also noticed a small leak from the gear box. The code only comes on when I am in 6th gear going 60+MPH. The wastegate actuator was sticking also but that is getting replaced when a the new one arrives.
Monday, June 19th, 2023 AT 9:19 PM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
The error code P0299 indicates a potential issue with the turbocharger or supercharger underboost condition.
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Tuesday, June 20th, 2023 AT 5:31 PM
Tiny
JOEN31
  • MEMBER
  • 5 POSTS
The wastegate actuator is sticking a new one is on the way to replace and hopefully that is the fix. Could the leak from the gear box also contribute to the lack of boost?
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Tuesday, June 20th, 2023 AT 8:49 PM
Tiny
KEN L
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I don't think the transmission leak is from low boost, good find on the problem though, let me know if that fixes it. Please start a new question for the leak. Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Wednesday, June 21st, 2023 AT 11:03 AM
Tiny
JOEN31
  • MEMBER
  • 5 POSTS
New actuator arrived today and is fitted. After a nice motorway run all seems fine and engine performance seems to have increased. So hopefully that has worked.

Now onto the transmission leak. Grr
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Wednesday, June 21st, 2023 AT 3:47 PM
Tiny
KEN L
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Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Friday, June 23rd, 2023 AT 10:04 AM
Tiny
JOEN31
  • MEMBER
  • 5 POSTS
Alas, it wasn't the actuator after all still have the same error code coming up. The leak also isn't from the transmission, it appears to be coming from the throttle body either from one of the hoses or the actual assembly itself. Could this cause the P0299?
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Monday, July 3rd, 2023 AT 9:28 PM
Tiny
KEN L
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I don't think so, can I ask if you changed out the boost sensor?
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Tuesday, July 4th, 2023 AT 9:59 AM
Tiny
JOEN31
  • MEMBER
  • 5 POSTS
Caved in and took it to the local garage. Turns out the throttle body was full of oil and also the pipes going into it. Going down the replacement turbo route.
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Tuesday, July 4th, 2023 AT 3:02 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
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Wednesday, July 5th, 2023 AT 12:09 PM

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