P04A4

Exhaust Pressure Control Valve B Stuck Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

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

Causes

Valve is dirty or clogged
Valve solenoid malfunction
Wiring harness damage
Mechanical valve jamming

How to Fix

Check the condition of the valve and its electrical connections
Clean or replace exhaust gas pressure control valve
Check the operation of the solenoid and wiring harness
Reset error and test drive

Related codes

P04A0 P04A1 P04A2 P04A3