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Citroen C6 2.7 HDI - Error code P0299
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cit-rotti   
Tue Oct 14 2025, 08:01pm
Joined: Dec 03 2018
Member No: #3753
Location: Bayern
 Hello,

Error code P0299 Boost pressure too low appears more and more frequently - can be deleted - no engine warning light - no emergency mode.

According to the error, it should be the front turbo.

Does anyone know this error and/or is there any advice on how to fix this error on the C6 – is it perhaps just a leak in a part?

Many thanks in advance for any advice/help.

Regards, Wolfgang
MGmike   
Wed Oct 15 2025, 07:47am

Joined: May 21 2017
Member No: #3151
Location: South Queensferry
 That code is not specific to front or rear!

Unless you have other errors which are specific, I would clean the MAP sensor first as it's easy to do. Be careful not to damage the membrane when unblocking the sensor.
C6Dave   
Wed Oct 15 2025, 08:04am


Joined: Oct 01 2009
Member No: #1
Location: Northumberland
 If cleaning the Map Sensor doesn't help, follow the guide below:
Website
cit-rotti   
Wed Oct 15 2025, 07:10pm
Joined: Dec 03 2018
Member No: #3753
Location: Bayern
 Thanks to:

MGmike and C6Dave

Regards, Wolfgang
 

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