P02A7 - Cylinder 4 – Fuel Trim at Max Limit
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System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
The P02A7 code indicates that the Engine Control Module (ECM) has reached its maximum enrichment limit for cylinder number 4. The adaptive fuel strategy is attempting to compensate for a localized lean condition by increasing the injector pulse width. When the long-term fuel trim for this specific cylinder exceeds the calibrated threshold (typically >25%), the ECU stores P02A7. This points towards a delivery issue or air leak specifically affecting cylinder 4.
Possible Causes
Clogged or faulty fuel injector on cylinder 4
Intake manifold vacuum leak near cylinder 4
High resistance in the injector wiring harness or connector
Mechanical engine fault (e.g., valve train issues or low compression on cylinder 4)
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.
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