P2423

HC Adsorption Catalyst Efficiency Below Threshold Bank 1

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Check Engine light comes on
Slight increase in fuel consumption
Smell of gasoline in the fuel tank area
Reduced performance of the EVAP system
Possible problems when passing technical inspection

Causes

Mechanical damage to the adsorption catalyst
Adsorption catalyst clogged
EVAP system valve malfunction
Leaks in the fuel vapor recovery system
Problems with EVAP system pressure sensors

How to Fix

Check the EVAP system for leaks
Check the condition of the adsorption catalyst
Test the operation of the EVAP system valves
Check the readings of the system pressure sensors
If necessary, replace the adsorption catalyst

Related codes

P2422 P2424 P0440