P21E1

Cylinder 3 Injector B Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Unstable engine idling
Misfire in cylinder 3
Reduced engine power
Increased fuel consumption
Check Engine Light Is On

Causes

Broken or damaged wires to the injector of cylinder 3
Cylinder 3 injector malfunction
Poor contact in the injector connector
Problems with injector relays
Engine control unit (ECU) malfunction

How to Fix

Check the integrity of the wiring to the injector of cylinder 3
Check injector resistance (compare with other cylinders)
Clean the contacts in the injector connector
Check the voltage on the injector circuit
If necessary, replace the injector or wiring harness

Related codes

P21E0 P21E2 P0203