OBDII Code List

P2097 ACURA - Post Catalyst Fuel Trim System Too Rich Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Air/Fuel Ratio (A/F) Sensor (Sensor 1)
  • A/F sensor (sensor 1) circuit range/performance
  • Fuel system too lean
  • Fuel system too rich
  • Secondary HO2S (sensor 2) circuit signal stuck lean
  • Secondary HO2S (sensor 2) circuit high voltage
  • Secondary HO2S (sensor 2) slow response
  • Engine Misfire
  • Exhaust system failure (exhaust gas leak)

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P2097 Acura Description

The Engine Control Module (ECM)/Powertrain Control Module (PCM) detects oxygen content in the exhaust gas by the Air/Fuel Ratio (A/F) Sensor (Sensor 1), and it uses feedback control before the warm up three way catalytic converter (WU-TWC) to bring the air/fuel ratio in the air/fuel mixture close to the target air/fuel ratio. The target air/fuel ratio is adjusted by the secondary heated oxygen sensor (secondary HO2S (sensor 2)) output so that the air/fuel ratio in the WU-TWC to be optimized. When the A/F sensor cannot be able to measure air/fuel ratio in the exhaust gas normally, a gap occurs between the actual air/fuel ratio. As a result, the gap causes a deviation in target air/fuel ratio control (after WU-TWC) which is determined by the secondary HO2 sensor. If the deviation exceeds a limit, the ECM/PCM detects a malfunction and stores a DTC.
OBDII Code P2097 Acura - Post Catalyst Fuel Trim System Too Rich Bank 1 -

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