P2098 indicates the post-catalyst oxygen sensor on Bank 2 is detecting a lean air-fuel mixture after the catalytic converter. This suggests the engine is running too lean, the catalyst is not functioning properly, or the sensor itself is faulty.
The sensor may be degraded, contaminated, or providing inaccurate readings, leading to a false lean signal.
Leaks before the sensor can introduce extra oxygen, causing the sensor to read a falsely lean condition.
Issues like vacuum leaks, faulty fuel injectors, or a weak fuel pump can cause the engine to run lean, affecting post-catalyst readings.
A failing catalyst may not properly process exhaust gases, leading to incorrect oxygen sensor readings.
Damaged wires, poor connections, or corrosion in the sensor circuit can cause erroneous signals.
While uncommon, a PCM issue could theoretically cause incorrect fuel trim calculations or sensor signal interpretation.
No, the PCM is rarely the cause of P2098. The issue is almost always related to the post-catalyst oxygen sensor, exhaust leaks, or fuel system problems. Replacing the PCM should only be considered after all other potential causes have been ruled out.
While the vehicle may still be drivable, prolonged driving with this code can lead to reduced fuel economy, potential catalytic converter damage, or failed emissions tests. It’s best to diagnose and repair the issue promptly.
Bank 2 refers to the side of the engine that does not contain cylinder #1. On V6, V8, or other multi-bank engines, this helps isolate the issue to the correct side of the exhaust system.
Indirectly, yes. A faulty pre-catalyst sensor can cause incorrect fuel trim, leading to a lean condition that may trigger P2098. However, the code specifically points to the post-catalyst sensor or its related components.