P2577

Direct Ozone Reduction Catalyst Efficiency Below Threshold

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$39–167 (est.)

Symptoms

Check Engine light comes on
Possible slight smell of ozone from the exhaust system
Slight increase in fuel consumption
No noticeable changes in engine performance

Causes

Ozone catalyst wear
Mechanical damage to the catalyst
Catalyst contamination
Problems with emission control system sensors
Open or short circuit in the sensor circuit

How to Fix

Diagnostics of the condition of the ozone catalyst
Checking exhaust system sensors
Checking the integrity of wiring harnesses
Replacing the ozone catalyst if necessary

Related codes

P0420 P0430 P0421