MasterTuning Fault code dictionary (DTC)

P0141 — Oxygen Sensor Heater Circuit Malfunction

Severity: Warning Can you drive? Yes, no known limitation Make: All makes (OBD-II standard)
MeaningThe engine computer found an electrical issue with the internal heater inside the downstream oxygen sensor. This heater brings the sensor up to operating temperature quickly, and without it, the sensor cannot send accurate exhaust readings to the computer.
FamilyPowertrain (P)

Typical symptoms

Check Engine light is on
Possible slight increase in fuel consumption

Common causes

Faulty oxygen sensor heater element
Blown fuse related to the oxygen sensor heater
Damaged or corroded wiring harness leading to the sensor

What to do

Have a mechanic check the sensor wiring and test the heater circuit resistance with a multimeter. It is not an immediate emergency that will strand you on the side of the road, but it should be looked at during your next routine service.

Frequently asked questions

What does code P0141 mean?

Oxygen Sensor Heater Circuit Malfunction. The engine computer found an electrical issue with the internal heater inside the downstream oxygen sensor. This heater brings the sensor up to operating temperature quickly, and without it, the sensor cannot send accurate exhaust readings to the computer.

Can I keep driving with code P0141 active?

Yes, no known limitation

Common causes — P0141

Faulty oxygen sensor heater element Blown fuse related to the oxygen sensor heater Damaged or corroded wiring harness leading to the sensor

How do you fix code P0141?

Have a mechanic check the sensor wiring and test the heater circuit resistance with a multimeter. It is not an immediate emergency that will strand you on the side of the road, but it should be looked at during your next routine service.

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