Additive adaptation: Diagnostics

• When the additive value reaches +3.33 mg fuel/combustion diagnostic trouble code P1181 is generated.

  The most probable causes are:

  • Air leak after the throttle.
  • Low fuel pressure.
• When the additive value reaches -3.33 mg fuel/combustion diagnostic trouble code P1182 is generated.

The most probable causes are:

• Purge valve stuck open.
• Air leak before the throttle.