Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2)

What does P043B mean?

P043B stands for Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2). A part of the emission control system is not working as expected. These codes rarely affect how the car drives, but the car may fail an emissions test.

Powertrain codes cover the engine, transmission and emissions. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.

Common causes

• Loose or damaged fuel cap (EVAP codes)
• Worn catalytic converter
• Faulty EGR valve or blocked EGR passages
• Faulty oxygen sensor
• Cracked hoses or a leaking purge valve

What to do

1. Read all stored and pending codes with a scanner. Several codes together often point to one cause.
2. Note the freeze frame data (speed, temperature, load) recorded when the code was set.
3. Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
4. Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.

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Frequently asked questions

What does P043B mean?

P043B means “Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2)”. It belongs to the emission controls group: A part of the emission control system is not working as expected. These codes rarely affect how the car drives, but the car may fail an emissions test.

Is it safe to drive with P043B?

Usually yes in the short term, but get it fixed so the car passes inspection and doesn't waste fuel.

How do I clear P043B?

Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.

Related codes

• P0437Catalyst Temperature Sensor Circuit Low (Bank 2 Sensor 1)
• P0438Catalyst Temperature Sensor Circuit High (Bank 2 Sensor 1)
• P0439Catalyst Heater Control Circuit (Bank 2)
• P043ACatalyst Temperature Sensor Circuit (Bank 2 Sensor 2)
• P043CCatalyst Temperature Sensor Circuit Low (Bank 2 Sensor 2)
• P043DCatalyst Temperature Sensor Circuit High (Bank 2 Sensor 2)
• P043EEvaporative Emission System Leak Detection Reference Orifice Low Flow
• P043FEvaporative Emission System Leak Detection Reference Orifice High Flow

Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.