P2198 - O2 SENSOR SIGNAL STUCK RICH BANK 2 SENSOR 1

The air/fuel ratio is constantly monitored by the Powertrain Control Module (PCM) through Oxygen (O2) Sensors. This sensor detects the oxygen levels that are present in the exhaust gas and then transmits them to the PCM.

The O2 Sensor generates a voltage reading which is used by the PCM to regulate the air/fuel ratio and maintain it to a stoichiometric ratio. In this way, the catalytic converter (TWC) can purify the exhaust gas more efficiently.

Storing the OBD2 trouble code P2198 means the PCM has found an excessively rich air/fuel ratio. It means there is more fuel than excess air. When this happens, the PCM cannot regulate the mixture. This code refers specifically to Oxygen Sensor number 1 which is on bank 2.

• Check Engine light ON.
• Lower fuel efficiency.

Reasons for setting the P2198 OBDII diagnostic code:

• The Oxygen Sensor circuit may be shorted or open.
• Damaged O2 Sensor cables or connectors.
• Perhaps the O2 Sensor is faulty.
• Fuel pressure may not be correct due to a bad injector.
• Possibly there are intake air leaks in the system.

The steps to solve the OBD2 DTC P2198 :

• With a multimeter connected to the Oxygen Sensor terminals, check for a short to ground or power. Compare manufacturer's specifications, and then repair as necessary.
• Check that the system cables and connectors are in good condition. You should repair or replace any of these components that are found to be defective.
• Inspect vacuum lines and test for possible vacuum leaks. Repair as applicable.
• Replace the Oxygen Sensor.