Code P017, Front Oxygen Sensor Not Ready: Notes

WARNING: This page is about a different car, the 1995 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

PCM provides .45-volt reference signal to oxygen sensor on circuit No. 412. When oxygen sensor reaches operating temperature, it will generate a counter voltage that will vary based on amount of oxygen in exhaust. Front oxygen sensor is located in manifold, behind cooling fan.

A lean exhaust will generate a low voltage and cause .45-volt reference signal to decrease. A rich exhaust will generate a higher voltage and cause .45-volt reference signal to increase.

Code P017 will set when oxygen sensor cannot respond under test conditions and generate a voltage greater or less than .45-volt reference.

Code P017 will also set under following conditions:

Open in circuit No. 412 or 413.
Short to voltage on circuit No. 412 or 413.
Faulty oxygen sensor.