P01B9

Engine Oil Temperature Sensor B Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–89 (est.)

Symptoms

Incorrect oil temperature readings on the dashboard
Check engine light comes on
Reduced engine efficiency
Problems with engine warming up

Causes

Oil temperature sensor (B) malfunction
Open or short circuit in wiring harness
Poor contact in the sensor connector
ECU problems (rare)

How to Fix

Check the integrity of the sensor wiring harness
Check the connections and connectors of the sensor
Replace oil temperature sensor (B) if necessary
Check the operation of the ECU (if other reasons are excluded)

Related codes

P01B8 P01BA P0197