Code Definition

P02A6 — Fuel Trim at Maximum Limit - Cylinder Number 4

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P02A6

P02A6 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P02A6 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P02A6 fault code is set when the Engine Control Module (ECM) detects that the fuel trim for Cylinder Number 4 is at its maximum limit. This condition indicates that the ECM is attempting to enrich or lean out the fuel mixture as much as possible to compensate for an imbalance or inefficiency in the combustion process in Cylinder 4. The fuel trim reaching its maximum limit suggests issues such as a lean or rich running condition, which could be due to various factors affecting the air-fuel mixture or combustion process in that specific cylinder.

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