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P2198 OBD-II Trouble Code: O2 Sensor Signal Stuck Rich Bank 2 Sensor 1

Check Engine Light

P2198 code definition

O2 Sensor Signal Stuck Rich Bank 2 Sensor 1

What the P2198 code means

This trouble code indicates that the upstream oxygen sensor on the second bank of the exhaust is sending a reference voltage to the powertrain control module that is not within the range of acceptance set by the vehicle manufacturer.

What are the causes of the P2198 code?

Some of the potential causes of this trouble code would include:

  • A faulty oxygen sensor could cause this issue
  • Faulty wiring or connectors that are associated with the oxygen sensor
  • A vacuum leak may exist
  • Incorrect fuel pressure could be a factor
  • A major exhaust leak could be part of the issue
  • A faulty powertrain control module may be present

What are the symptoms of the P2198 code?

Some of the symptoms that a driver with this trouble code could potentially experience may include:

  • Rich fuel conditions may exist
  • The vehicle may have decreased fuel economy
  • A Check Engine Light will likely be illuminated

How does a mechanic diagnose the P2198 code?

A mechanic may diagnose this trouble code by first locating the upstream oxygen sensor on the second bank of exhaust. Once this sensor has been located, the mechanic would then check the wiring and connectors associated with this sensor to make sure they are in good condition. If the circuitry is in good shape, the mechanic would then test the oxygen sensor itself.

There is a test in which a small torch can be used to heat up the inner portion of an oxygen sensor that has been removed from the vehicle. While the torch is heating up the oxygen sensor the mechanic can use a digital multimeter to check the voltage coming from the oxygen sensor. This will help determine whether or not the oxygen sensor has failed.

If both of these tests result in the oxygen sensor and circuitry being okay, the mechanic would then check fuel pressure and vacuum signal. After these numbers have been verified to be within the manufacturer’s specifications, the mechanic would test the powertrain control module. If the numbers are not within specification, the issues related to the fuel or vacuum systems must be resolved before any further diagnosis can take place.

Common mistakes when diagnosing the P2198 code

A common mistake that could be made when diagnosing this trouble code would be replacing the oxygen sensor when the actual cause is a fuel pressure issue. It is important to check all aspects of the problem to ensure that no parts get replaced by mistake.

How serious is the P2198 code?

This code is not very serious because it does not cause any drivability issues. However, this trouble code should be diagnosed and repaired as soon as possible to save gasoline. This trouble code can end up costing more money if ignored than the cost of the repair depending on how long the trouble code is stored. With this being considered, repairing the vehicle would eventually pay for itself with the money that would be saved in fuel costs.

What repairs can fix the P2198 code?

Repairs that can resolve the issues that are caused by this trouble code would include:

  • Replacing the upstream oxygen sensor on the second bank of exhaust

  • Replacing the wiring or connectors that are associated with the oxygen sensor that is upstream on the second bank of exhaust

  • Repairing a vacuum leak by replacing lines or gaskets

  • Resolving a fuel pressure issue that could be caused by a fuel pump, clogged fuel filter, fuel pressure regulator, etc.

  • Repairing a major exhaust leak by welding new parts on or patching existing exhaust parts.

  • Replacing the powertrain control module.

Additional comments regarding the P2198 code

Nobody likes to waste fuel. Consider your potential extra fuel costs when you discover that this trouble code is stored in your vehicle. These costs can add up pretty quickly. It is important to have all check engine lights diagnosed and repaired at the earliest possible opportunity in order to prevent any further issues with your vehicle.

Need help with a P2198 code?

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The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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