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Home >> Fiat >> 2016 >> 500 Turbo, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 120 (1.4L 16-Valve - DTCS P0016-00 To P0353-00 - 500) >> DTC Troubleshooting >> P0031-00-O2-Sensor 1/1 Heater Circuit Low >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

For the Wideband 02 Sensor to deliver accurate readings the sensing elements must be heated. A Positive Temperature Coefficient (PTC) element inside the O2 Sensor heats up as current passes through it. This allows the system to enter Closed Loop quickly. The Powertrain Control Module (PCM) turns on this circuit based on Engine Coolant Temperature (ECT) and engine loads. The PCM monitors the O2 Sensor's heater for proper operation. If a malfunction occurs the circuit is turned off and a DTC will set.

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