Code result
P0052
HO2S Heater Control Circuit High
Moderate severity
What it means
HO2S Heater Control Circuit High (Bank 2 Sensor 1): the control-circuit voltage is above the expected range. The heater brings the oxygen sensor to operating temperature for closed-loop fuel control.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Heater wire shorted to supply
highOne of the most commonly reported causes for this code — check this first.
Connector pins corroded - high contact resistance
lowLess common, but worth ruling out after the more likely causes.
Supply wire pinched against B+ source
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P0052 freeNo credit card required