Powertrain
generic / SAE
P03BA
Cylinder 4 Pressure Variation Low
Cylinder-to-cylinder pressure variation on cylinder 4 is below the calibrated minimum — pressure stays unusually constant cycle-to-cycle, often a sign that the closed-loop combustion controller has lost authority or the sensor signal is filtered.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number3 / BA
Possible causes
- Sensor signal filtered high
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–2000 €
- Estimated time: 1–5 h
- Component: cylinder pressure sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012