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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21997
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I got a landrover freelander with engine light on checked

Resolved Question:

i got a landrover freelander with engine light on checked code and it said p0299 turbocharger/supercharger a underboost conditions i have replace egr valve and air flow sender and with it rev in checked the intercooler pipes all ok could this be caused by the turbo
Submitted: 1 year ago.
Category: Car
Expert:  Matt replied 1 year ago.

Hello

this could be a faulty turbo if you remove the high pressure intake hose after the turbo and have a feel of the turbine wheel - there should be no play radially at all - but a little bit of axial / end to end float is normal

I'd also check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.

If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues

Also have a feel around with your bare hands with the engine running to see if you can feel any escaping gas under your touch. Another method is to use a soap and water solution sprayed onto any suspect areas - if there's a leak it'll bubble up with the engine running

Also check that the vacuum hose running to the dump / turbo bypass valve is intact with no leaks as if the dump valve is opening prematurely you'll be losing all your boost

one other possibility is that the wastegate actuator spring has gone soft so allowing the wastegate to open prematurely - if your actuator has a threaded end you can increase the preload on it to see if this improves things otherwise these units are quite cheap compared to a new turbo so it may be worth trying a replacement

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