Code result
P01F2
O2 Sensor Circuit Low Voltage Bank 1 Sensor 4
Moderate severity
What it means
Bank 1 sensor 4 O2 sensor signal voltage below expected range — short to ground or sensor stuck low.
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
Signal wire shorted to ground
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.
Harness chafing through insulation
lowLess common, but worth ruling out after the more likely causes.
Related help
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