sophiemayer3
Sprinter gasoline engine boost pressure issue
Summary of the thread
A 2009 Mercedes Sprinter with a gasoline engine is experiencing a loss of power, poor engine response, and increased fuel consumption, with the check engine light on. The suspected issue is a boost pressure control fault, potentially caused by a vacuum leak or a faulty boost solenoid. After consulting a workshop, the problem was identified as a defect in a vacuum switching valve, which was repaired, resolving the issue.
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4 comment(s)
sophiemayer3 (community.author)
When you say vacuum lines, do you mean the little rubber hoses connected to the intake? Where is the boost controller usually located? I'm not very mechanically gifted, so please explain it simply.
christopherbeck26
Yes, those little rubber hoses. On my Astra, many were brittle and cracked, causing my pressure sensor to give wrong readings. The boost controller's location depends on your engine setup, but it's usually near the turbocharger. If you aren't super confident, it might be worth getting it checked at a workshop before you cause more damage.
sophiemayer3 (community.author)
I took it to a workshop. It was a defect in a vacuum switching valve, just like I suspected. The repair cost was 140€. It runs like new now.
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MERCEDES
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SPRINTER
christopherbeck26
That sounds rough. I had something similar happen with my old Vauxhall Astra, though it was a different engine. I also had a pressure drop issue linked to the boost controller. Is it throwing any specific codes? I'd start by checking all the vacuum lines for cracks or splits, as a tiny leak can cause big problems.