P01F1

O2 Sensor Circuit Bank 1 Sensor 4

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased fuel consumption
Deterioration of vehicle dynamics
Check Engine Light Is On
Unstable engine operation at idle

Causes

Open or short circuit in the sensor wiring harness
Oxidation of sensor contacts
Oxygen sensor malfunction
Problems with the sensor connector
ECU malfunction

How to Fix

Check the integrity of the sensor wiring harness
Clean the sensor and connector contacts
Check the resistance and voltage at the sensor
Replace the oxygen sensor if necessary
Reset the error and check the system operation

Related codes

P0137 P0138 P0140 P0141