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Home >> Subaru >> 2019 >> WRX STI Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Control System (Diagnostics) (Except For STI) (4 Of 4)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P219A: Bank 1 Air-Fuel Ratio Imbalance >> Execution Condition

Execution Condition

WARNING: This page is about a different variant/trim than selected.

Monitor A1: Primary oxygen sensor fluctuation 

Secondary parameters Execution condition
Battery voltage ≥ 10.9 V
Barometric pressure ≥ 75.06 kPa (563 mmHg, 22.2 inHg)
Main feedback In operation
Engine speed > 1500 rpm
and
< 4000 rpm
Charging efficiency > 70 air mass %
Time when not under catalyst neutralization control as well as not under a gradual change ≥ 0.5 s
Fuel control for short-term fuel trim by A/F sensor response monitoring (only for MT model) Intrusively changed

Monitor B1: Crankshaft speed fluctuation 

Secondary parameters Execution condition
Misfiring diagnosis monitoring In operation
Accelerator pedal position 0%
Main feedback In operation
Engine speed > 1500 rpm
and
< 4000 rpm
Charging efficiency > 70 air mass %