P289E

Cylinder 4 Ion Current Sense Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

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

Causes

Open or short circuit in the ion current circuit
Malfunction of the ion current sensor of the 4th cylinder
Problems with the wiring harness or connectors
Engine control unit malfunction
Poor contact in the sensor circuit

How to Fix

Check the integrity of the ion current circuit of the 4th cylinder
Inspect connectors and wiring harness for damage
Check the resistance of the ion current sensor
If necessary, replace the ion current sensor
Check and, if necessary, reflash the engine control unit

Related codes

P289D P289F P2890