P043A

Symptoms

• Check Engine light is on
• Bank 2 catalyst temperature control failure
• Increased harmful emissions
• In most cases, ride quality is not affected
• Emergency neutralizer control mode possible

Causes

• Faulty bank 2 catalytic converter temperature sensor
• Open or shorted sensor wiring
• Damage to wire insulation due to high temperatures
• Oxidation or damage to the sensor connector
• Mechanical damage to the sensor
• ECU malfunction (rare)

How to Fix

1. Read all error codes - pay attention to the combination with P043B
2. Visually inspect the sensor and wiring in the catalyst area of bank 2
3. Check the voltage and grounding in the sensor connector with the ignition on
4. Measure the sensor resistance and compare with the norm
5. Replace the temperature sensor if the fault is confirmed
6. Check the integrity of the wiring harness from the sensor to the ECU
7. Reset codes and take a test drive

Related codes

Error P043A by Vehicle Brand