Is cylinder 4 easy to reach?

On inline-4 engines, cylinder 4 is at one end. On V-engines, check your firing order to find which physical cylinder is number 4.

Can fuel injector cleaner help?

Not for P0204 — this is an electrical circuit fault, not a clogged injector. Cleaner helps with flow issues, not electrical problems.

High Severity

Fuel System

Cylinder 4 injector circuit fault.

Common Fix

Replace cylinder 4 injector

Estimated Cost (DIY)

$40 - $150

Faulty injectorlikely

Wiring issuepossible

Connector corrosionpossible

Need to read or clear this code?

Is cylinder 4 easy to reach?: On inline-4 engines, cylinder 4 is at one end. On V-engines, check your firing order to find which physical cylinder is number 4.
Can fuel injector cleaner help?: Not for P0204 — this is an electrical circuit fault, not a clogged injector. Cleaner helps with flow issues, not electrical problems.

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