P2198 Fault Code

O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 1

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2198 code indicates that the engine control module (ECM) has detected that the oxygen sensor signal on Bank 2, Sensor 1 is biased or stuck rich. This means that the sensor is reporting a higher voltage than expected, indicating an excess of fuel in the air-fuel mixture. It is crucial to address this issue to ensure optimal engine performance and prevent potential damage.

What are the symptoms of the P2198 code?

• Poor fuel economy due to an excessively rich air-fuel mixture
• Rough idling or stalling of the engine
• Increased emissions potentially leading to failed emissions tests
• Illuminated check engine light on the dashboard

What causes the P2198 code?

• Faulty O2 sensor
• Shorted wires to the O2 sensor
• Vacuum leaks leading to incorrect readings
• Faulty fuel injectors causing an overly rich mixture
• Engine control unit (ECU) malfunctions

How to fix P2198?

• Inspect and test the O2 sensor for proper operation; replace if necessary.
• Check the wiring and connectors to the O2 sensor for shorts or damage, repair as needed.
• Examine the fuel system components such as fuel injectors and pressure regulator for leaks or faults.
• Inspect for vacuum leaks that could affect the sensor readings.
• Reset the fault codes and recheck the system functionality after repairs.