Conditions For Setting DTC
WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The PCM monitors the fuel composition frequency during the first 30 seconds of run time. If the fuel composition is above the given threshold for the ambient temperature, for 25 seconds of the 30 second interval, DTC P0169 will set. The table for temperature versus frequency thresholds is contained in Diagnostic Aids. See DIAGNOSTIC AIDS .