987 · Engine

P0021

"A" Camshaft Position Timing Over-Advanced or System Performance (Bank 2)

MED SEVERITY

Bank 2 counterpart to P0011: intake cam timing over-advanced / VarioCam Plus performance fault on cylinders 4-6. On 987.2 DFI cars this generic code is the primary VarioCam timing code for bank 2; 987.1 cars typically log P1324/P1325.

SYMPTOMS

  • Check-engine light
  • Rough idle
  • Hesitation
  • Power loss

LIKELY CAUSES

  • Sticking/clogged oil-control valve (bank 2)
  • Low oil pressure or degraded oil
  • Failed VarioCam adjuster
  • Worn cam-timing components
  • Cam sensor fault

DIAGNOSIS STEPS

  • Verify oil level/pressure
  • Clean or replace the oil-control valve
  • Compare actual vs commanded cam angle
  • Inspect cam sensor
  • Inspect timing components if persistent

RELATED PARTS

  • Camshaft oil-control valve
  • VarioCam adjuster
  • Camshaft position sensor
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