Code Definition

P1088 — Fuel Control Lean Bank 1

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Holden

About P1088

P1088 is a manufacturer-specific powertrain diagnostic trouble code recorded for Holden vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1088 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine.

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.

P1088 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Engine Control Module (ECM) continuously monitors the air to fuel ratio using the Bank 1 oxygen sensor feedback while operating in closed loop and trims injector pulse width to hold the mixture at the target ratio. DTC P1088 is set when the ECM determines that sustained fuel trim corrections have reached the upper enrichment limit on Bank 1, indicating the mixture remains lean even though the ECM is already commanding maximum practical fuel addition. This condition must be present for a calibrated time and operating window, typically during steady cruising or light load, before the fault i...

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