P0179

Fuel Composition Sensor Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Unstable engine operation
Increased fuel consumption
Power reduction
Check Engine Light Illuminates

Causes

Fuel composition sensor malfunction
Open or short circuit in wiring harness
Poor connection or corrosion in connectors
ECU malfunction

How to Fix

Check the integrity of the wiring harness and connectors
Check the resistance and voltage of the fuel composition sensor
Replace sensor if necessary
Check and reflash the ECU if it is suspected of being faulty

Related codes

P0172 P0175 P0180