P2098 - P2098 - POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 2

POST UPDATED IN May, 2021

Description of DTC code P2098 Generic

The O2 sensors indicate the PCM the amount of oxygen that is in the exhaust, which is used to control and determine the air/fuel mixture. If there is a high oxygen content, the mixture is lean. Contrary to this, a rich mixture will be obtained. The Oxygen Sensor has a cycle every second. It provides the PCM with a voltage that varies between 0.2 to 0.8 for a lean or rich mixture respectively.

The DTC P2098 OBDII indicates that the Powertrain Control Module (PCM) detects through the Oxygen (O2) Sensors, a lean condition in the fuel trim system, which is located at the rear of the Catalytic Converter (TWC).

Symptoms of fault code P2098 Generic

  • The Check Engine light illuminates.
  • Lower fuel efficiency.
  • Difficulties during acceleration.
  • Other fault codes

Causes of OBD2 P2098 Generic

The reasons for setting the P2098 OBD2 trouble code are:

  • Low fuel pressure due to filter blockages or pump damage.
  • Vacuum leakage may occur.
  • Perhaps there are air leaks very close to the Oxygen Sensor number 1.
  • Catalytic Converter d If this is the case, it is likely that the catalytic converter related codes have been set.
  • The O2 Sensor may be faulty.
  • The Mass Air Flow (MAF) sensor may be damaged. In this case, other error codes will also be set.
  • Defective exhaust system components.

Possible solutions of the DTC code P2098 Generic

To troubleshoot problems related to the P2098 OBDII diagnostic code, try this:

  • Consult the Technical Service Bulletins related to your vehicle.
  • If other DTCs are set, diagnose those codes first.
  • Check for engine vacuum leaks, especially between the MAF Sensor and the intake manifold. Fix if necessary.
  • Check all the cables and connectors in the system, and verify that none are damaged. Repair or replace.
  • Replace the Oxygen Sensor on bank 2, downstream of the catalytic converter.

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