P2A04 Fault Code

O2 Sensor Circuit Range/Performance Bank 2 Sensor 2

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

The P2A04 fault code indicates an issue with the Oxygen (O2) sensor circuit on Bank 2, specifically for Sensor 2. This sensor is located downstream of the catalytic converter and is critical in monitoring the efficiency of the exhaust system. A properly functioning O2 sensor helps ensure optimal fuel efficiency and reduces harmful emissions.

What are the symptoms of the P2A04 code?

• Increased fuel consumption
• Rough idling or stalling
• Poor engine performance or sluggish acceleration
• Illuminated Check Engine Light (CEL)
• Failed emissions tests

What causes the P2A04 code?

• Faulty O2 sensor
• Wiring or connection issues within the O2 sensor circuit
• Exhaust leaks before the sensor
• Engine performance problems affecting sensor readings
• Issues with the Engine Control Unit (ECU) that impact sensor functionality

How to fix P2A04?

• Inspect and clean the O2 sensor and its connectors.
• Replace the faulty O2 sensor if necessary.
• Repair any damaged wiring or connections in the sensor circuit.
• Check for exhaust leaks and repair them to ensure accurate sensor readings.
• Reprogram or replace the ECU if it is found to be malfunctioning.