B0121

Fluid Reservoir Level Sensor F

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

The passive safety system fault indicator is on
The passive safety system can be disabled
Incorrect liquid level readings

Causes

Liquid level sensor malfunction
Open or short circuit in wiring harness
Poor contact in the sensor connector
Damage to the fluid reservoir

How to Fix

Check the fluid level in the reservoir
Inspect the sensor and its connector for damage
Check the integrity of the sensor circuit
Replace sensor if necessary
Clean or replace connector if there is corrosion

Related codes

B0100 B0101 B0120