P01F5

O2 Sensor Circuit No Activity Detected Bank 1 Sensor 4

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine Light Is On
Deteriorating fuel economy
Reduced catalytic converter efficiency

Causes

Broken or damaged sensor wiring harness
Oxygen sensor malfunction
Problems with power or grounding of the sensor
Engine control unit (ECU) malfunction

How to Fix

Check the integrity of the sensor wiring harness
Check the voltage and grounding of the sensor
Replace the oxygen sensor if necessary
Check the operation of the engine control unit

Related codes

P0135 P0141 P0155