Powertrain
generic / SAE
P289C
Cylinder 4 Ion Current Sense Circuit
The ECM cannot read a valid ion current signal from cylinder 4. Ion current sensing relies on the spark plug acting as an electrode after combustion.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number8 / 9C
Possible causes
- Ion sense module failed high
- Wiring or connector fault medium
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
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References
sae:J2012