P21D2

Cylinder 4 Injector B Circuit/Open

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Unstable engine idling
Misfire in cylinder 4
Reduced engine power
Increased fuel consumption
Check Engine Light Is On

Causes

Open or short circuit in the injector circuit
Poor contact in the injector connectors
Malfunction of the injector itself
Problems with the engine control unit
Wiring harness damage

How to Fix

Check the integrity of the wires to the injector of cylinder 4
Inspect the injector connectors for oxidation or damage.
Check injector resistance (compare with other cylinders)
If necessary, replace the injector
Check the power supply and control signal from the ECU

Related codes

P0204 P0213 P0265