P21D7

Cylinder 9 Injector B Circuit/Open

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$17–89 (est.)

Symptoms

Misfire in cylinder 9
Reduced engine power
Increased fuel consumption
Unstable engine idling
Check Engine Light Illuminates

Causes

Open or short circuit in the injector circuit
Cylinder 9 injector malfunction
Wiring harness damage
Problems with the engine control unit
Oxidation of injector connector contacts

How to Fix

Check the integrity of the injector wiring and connectors
Test injector resistance
Check for voltage at the injector connector
Replace the faulty injector if necessary
Clean or replace oxidized contacts

Related codes

P21D6 P21D8 P0209