P1266 OBD Code Definition:
P1266 Cylinder #6 High To Low Side Short
P1266 OBD Code Description:

Possible Symptoms

• Malfunction Indicator Light (MIL) ON
• Reduced Power Output

Possible Causes

• Wiring and/or Connector(s) from/to PD Unit Injector: Cylinder 2 faulty
• PD Unit Injector: Cylinder 2 faulty
• Camshaft worn out / faulty

Possible Solutions

• Check Wiring and/or Connector(s) from/to PD Unit Injector: Cylinder 2
• Check/Replace PD Unit Injector: Cylinder 2
• Check Camshaft for Signs of wear

Tech Notes

• Injectors on TDI PD/PPD Engines are not designed to run Waste Vegetable Oil (WVO) or Straight Vegetable Oil (SVO) as well as anything above 5% Biodiesel Content. Running these Types of Fuels can Damage the Injectors. Please Refer to the Owners Manual and/or Factory Repair Manual for a list of appropriate Fuel Types.