P289C

Cylinder 4 Ion Current Sense Circuit

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–33 (est.)

Symptoms

Unstable engine operation
Misfire in cylinder 4
Increased fuel consumption
Reduced engine power
Check Engine Light Illuminates

Causes

Open or short circuit in the ion current circuit
Malfunction of the spark plug of the 4th cylinder
Wiring harness damage
Engine control unit malfunction
Poor contact in connectors

How to Fix

Check the condition of the spark plug in the 4th cylinder
Check the integrity of the ion current circuit
Inspect connectors and wiring harness for damage
Check the resistance of the ion current circuit
If necessary, replace the spark plug or repair the wiring

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