Code Definition

P02B4 — Injector Restricted - Cylinder Number 7

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

About P02B4

P02B4 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 P02B4 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 Engine Control Module (ECM) sets this code when it detects that the fuel injector for cylinder 7 is not delivering the expected amount of fuel. This is typically due to a restriction in the injector, leading to an improper air-fuel mixture. The ECM monitors injector flow through fuel pressure changes and feedback from the oxygen sensors. A restricted injector can cause lean conditions, misfires, rough idling, and reduced engine performance.

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