P2098 - POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 2

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).

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

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.

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.