P2238 Fault Code

O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 1

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

The P2238 fault code indicates a problem with the oxygen (O2) sensor's positive current control circuit for Bank 1 Sensor 1. This sensor regulates the amount of fuel injected into the engine based on exhaust gas composition. When the control circuit is low, it can result in improper fuel-air mixture and poor engine performance.

What are the symptoms of the P2238 code?

Drivers may experience a variety of symptoms related to this fault code, such as:

• Reduced engine performance and efficiency.
• Check Engine light illuminated on the dashboard.
• Increased fuel consumption due to improper fuel-to-air mixture.
• Rough idling or stalling of the engine.

What causes the P2238 code?

There are several potential causes for the P2238 code, including:

• Faulty O2 sensor, which may have electrical issues.
• Damaged wiring or connectors in the O2 sensor circuit.
• Corrosion or contamination affecting the sensor's functionality.
• Issues in the engine control unit (ECU) affecting sensor readings.

How to fix P2238?

To resolve the P2238 fault code, mechanics typically follow these steps:

• Perform a detailed visual inspection of the O2 sensor and associated wiring for damage or corrosion.
• Test the O2 sensor for proper voltage and functionality; replace if necessary.
• Check for any ECU issues and ensure that it is correctly processing information from the O2 sensor.
• Clear the fault code and conduct a test drive to see if the issue reoccurs.