Code Definition

P2190 — System Too Rich At Idle Bank 2

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

About P2190

P2190 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.

When P2190 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.

Because P2190 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 ECM uses feedback from the upstream oxygen or air fuel ratio sensor to hold the mixture close to stoichiometric, adjusting injector pulse width through short term and long term fuel trim to correct for variation. DTC P2190 is set when the ECM finds it must remove a substantial amount of fuel at idle on bank 2 specifically, with fuel trim driven well negative, commonly beyond about 10 percent, in order to bring the mixture back into range. Because the fault is limited to one bank and to idle conditions, it points at something affecting only the cylinders on that bank rather than a whole eng...

Join TaT to view the complete code information and diagnostic details.

Quick Facts