P3421

Cylinder 3 Exhaust Valve Control Circuit/Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Unstable engine operation
Power Loss
Increased fuel consumption
Check Engine Light Is On
Possible misfire in cylinder 3

Causes

Broken wiring to the valve of the 3rd cylinder
Solenoid valve malfunction
Problems with the engine control unit
Short circuit in the circuit
Mechanical failure of the valve mechanism

How to Fix

Check the integrity of the wiring to the valve
Test solenoid valve resistance
Check connector contacts
Diagnose the engine control unit
If necessary, replace the faulty valve

Related codes

P3420 P3422 P3423