Powertrain
generic / SAE
P28B3
Cylinder 9 Ion Current Sense Circuit High
Ion current from cylinder 9 is above the expected window. Cross-coupled signal, biased reference, or sensor fault.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number8 / B3
Possible causes
- Inductive cross-coupling from ignition coil primary high
- Sense reference voltage biased 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 9
- Component: ignition coil cyl 9
- Component: ion sense module
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012