P21F3

Cylinder 12 Injector B Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$22–89 (est.)

Symptoms

Uneven engine operation
Power Loss
Increased fuel consumption
Check Engine Light Is On
Possible misfire in cylinder 12

Causes

Injector circuit short circuit to power
Broken or damaged wiring to the injector
Malfunction of the injector itself
Problems with the engine control unit
Corrosion or poor contact in the injector connector

How to Fix

Check the integrity of the wiring harness to the injector
Measure the injector resistance
Check the voltage in the injector control circuit
If necessary, replace the injector
Check connectors and contacts for corrosion

Related codes

P21F0 P21F1 P21F2