P2A06 Fault Code

O2 Sensor Negative Voltage Bank 1 Sensor 1

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

The P2A06 fault code indicates a problem with the oxygen (O2) sensor's electrical circuit, specifically in Bank 1 Sensor 1. This sensor plays a crucial role in monitoring the air-fuel mixture delivered to the engine, which is essential for optimal performance and emissions control. When the PCM (Powertrain Control Module) detects a negative voltage signal from this sensor, it triggers the P2A06 code.

What are the symptoms of the P2A06 code?

• Check engine light illumination
• Poor fuel economy due to improper air-fuel mixture
• Increased emissions
• Rough engine performance or misfires
• Failure to pass emissions testing

What causes the P2A06 code?

• Faulty O2 sensor
• Damaged wiring or connectors in the sensor circuit
• Short circuit or ground fault in the wiring
• Issues with the engine control unit (ECU) causing incorrect readings
• Exhaust leaks affecting sensor readings

How to fix P2A06?

• Inspect the O2 sensor and its wiring for damage.
• Replace the faulty O2 sensor as necessary.
• Repair or replace any damaged wiring or connectors.
• Check for exhaust leaks and fix them to ensure accurate sensor function.
• Clear the fault code and monitor the vehicle for reoccurrence.