P2891

Cylinder 1 Ion Current Sense Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Unstable engine idling
Reduced engine power
Increased fuel consumption
Check Engine Light Illuminates
Possible misfire in cylinder 1

Causes

Open or short circuit in the ion current circuit
Cylinder 1 spark plug fault
Problems with the ignition coil
Sensor contacts are dirty or damaged
Engine control unit malfunction

How to Fix

Check the condition of the spark plug in cylinder 1
Check the integrity of the wires of the ion current circuit
Diagnose the ignition coil
Clean sensor contacts and check connections
If necessary, replace the ion current sensor

Related codes

P2892 P2893 P2894