Powertrain
generic / SAE
P289E
Cylinder 4 Ion Current Sense Circuit Low
Ion current from cylinder 4 is below the expected window. Spark plug fouled, signal wire shorted to ground, or sensing path interrupted.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number8 / 9E
Possible causes
- Spark plug fouled with carbon or oil high
- Sense wire shorted to ground medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 100–700 €
- Estimated time: 0.5–3 h
- Component: spark plug cyl 4
- Component: ignition coil cyl 4
- Component: ion sense module
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012