Additive adaptation: Diagnostics

WARNING: This page is about a different car, the 2004 Saab 9-5. However, it is still accessible from the selected car via links, so may be relevant.

When the additive value reaches +5 mg fuel/combustion, diagnostic trouble code P1181 will be generated.
The most probable causes are:
- Air leak after the throttle.
- Low fuel pressure.
When the additive value reaches -5 mg fuel/combustion, diagnostic trouble code P1182 will be generated.
The most probable causes are:
- Purge valve stuck open.
- Air leak before the throttle.