P28AA

Cylinder 7 Ion Current Sense Circuit Low

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$17–89 (est.)

Symptoms

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

Causes

Open or short circuit in the ion current circuit of the 7th cylinder
Malfunction of the spark plug of the 7th cylinder
Problems with the ignition coil
Engine control unit malfunction
Poor contact in sensor circuit connector

How to Fix

Check the integrity of wires and connections in the circuit of the 7th cylinder
Replace the spark plug in cylinder 7
Check and, if necessary, replace the ignition coil
Test sensor circuit resistance
Check ECU software for updates

Related codes

P28A0 P28A1 P28A9 P28AB