P2C21

Engine Oil Temperature Sensor A/B Correlation

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Unstable engine operation
Incorrect oil temperature readings on the dashboard

Causes

Oil temperature sensor A or B faulty
Open or short circuit in the sensor circuit
Poor contact in sensor connectors
Malfunction of the engine control unit (ECU)
Contaminated or low engine oil level

How to Fix

Check the level and condition of the engine oil
Conduct diagnostics of oil temperature sensors
Check the integrity of wiring and connectors
Replace faulty oil temperature sensor
If necessary, reflash or replace the ECU

Related codes

P2C20 P2C22 P0197