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P0299 Fault: 2004 S40 1.9t

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#1 DanPaq


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Posted 10 October 2011 - 07:41 PM

I posted this in troubleshooting with no avail, so I decided to come here. My check engine light came on and gave this code, which is an under boost code. I can feel my car takes longer to build up pressure and I am unsure how to troubleshoot this issue. could it be as simple as replacing a clamp or a hose, or something complicated like adjusting the turbo actuator. Weirdly, I noticed that my transmission shifts smoother after the check engine light appeared, lol...

Dan P.
2004 Volvo S40

#2 xcites40


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Posted 13 October 2011 - 05:01 PM

Turbocharger (TC) control valve, Pressure too low flow fault

Check the boost control solenoid (clean it), wastegate setting and your vacuum hoses.
11 XC60 T6 R-design (daughter ride)
07 Scion TC (wife's car)
04 S40 LSE B4204T4 Daily driven - Hybrid turbo club
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