Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0125 is designed to detect a skewed sensor or a faulty thermostat.
A skewed IAT sensor may cause this DTC to set, The IAT sensor should read near ambient temperature with the engine running.