P0133 Fault Code

O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)

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

The P0133 fault code indicates that the O2 sensor circuit for Bank 2 Sensor 1 is experiencing a slow response time. This sensor plays a critical role in monitoring the oxygen levels in the exhaust and signaling the engine control unit (ECU) for optimal fuel-air mixture. If the sensor response is slow, it can lead to poor engine performance, increased emissions, and decreased fuel efficiency.

What are the symptoms of the P0133 code?

• Decrease in fuel efficiency
• Rough idling or engine stalling
• Illuminated check engine light
• Failed emissions test
• Increased engine noise or performance issues

What causes the P0133 code?

• Aging or faulty O2 sensor
• Wiring issues such as shorts or opens in the circuit
• Exhaust leaks affecting sensor readings
• Contaminated or damaged sensor due to extreme conditions or exposure to fuel additives
• Incorrect fuel mixture leading to sensor malfunction

How to fix P0133?

• Inspect and replace the Bank 2 Sensor 1 O2 sensor if found faulty
• Check and repair any wiring issues connected to the O2 sensor
• Fix any exhaust leaks that could affect sensor performance
• Clear any trouble codes and test drive the vehicle to ensure proper function
• Reset the ECU to allow the new sensor to calibrate correctly