P0178

Fuel Composition Sensor Circuit Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Unstable engine idling

Causes

Fuel composition sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Problems with the ECU

How to Fix

Check the continuity of the fuel composition sensor circuit
Inspect the sensor connector for corrosion or damage.
Replace the fuel composition sensor if necessary
Check the operation of the computer

Related codes

P0172 P0175 P0180