P2098 - POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 2
Description of DTC code P2098
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
- The Check Engine light illuminates.
- Lower fuel efficiency.
- Difficulties during acceleration.
- Other fault codes
Causes of OBD2 P2098
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
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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