Inspect the boost path
Check connecting hoses and pipes for incorrect assembly, disconnection or leakage. Include the diverter valve and boost-control system in the inspection plan before selecting a replacement turbo.
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Use engine-specific evidence
For applicable 2.0 TFSI engines, Ross-Tech directs attention to a cracked N249 diverter-valve diaphragm. For 2009–2012 Audi CAEB engines it points to excessive wastegate play and the relevant Audi bulletin. These are separate diagnostic branches, not interchangeable repairs.
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If the plumbing checks out
Turbo mechanical damage and an exhaust restriction can also produce this code. Have those conditions tested using the correct engine procedure. When misfire or fuel-trim codes are present too, investigate the associated PCV fault guidance.
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Sources / references 1
- Ross-Tech fault reference ↗Reviewed Oct 8, 2026
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