P02F0 - Cylinder 4 Injector - Contribution/Balance Fault
Last updated:
System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P02F0 is stored when the Engine Control Unit (ECU) detects that cylinder number 4 is not contributing the expected amount of power or torque to the crankshaft. The ECU monitors crankshaft acceleration using the Crankshaft Position (CKP) sensor during each power stroke. If the acceleration increment for cylinder 4 is below a specific threshold compared to the other cylinders, a contribution/balance fault is triggered. This can be caused by electrical resistance issues in the injector, mechanical wear affecting the spray pattern, or fuel delivery deviations exceeding the fuel trim limits set by the IQA (Injector Quantity Adjustment) logic.
Possible Causes
Clogged or faulty fuel injector (Cylinder 4)
Incorrect IQA/IMA injector coding in the ECU
High resistance or corrosion in the wiring harness to injector 4
Low engine compression in cylinder 4 due to mechanical wear or valve issues
Symptoms
Recommended Solution
Workflow
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
Do you also have
other fault codes?
See how P02F0 connects with your other fault codes. Our advanced analysis tool identifies causal relationships and root causes directly.