P0433: Heated Catalyst Efficiency Below Threshold Bank 2 — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
Heated Catalyst Efficiency Below Threshold Bank 2. Basic catalogue definition; diagnostic details have not yet been reviewed.
Affected system: Powertrain
Symptoms
- Warning light may illuminate
- Intermittent or implausible live data
- Symptoms vary by vehicle
Possible causes
- Catalyst degradation, incorrect mixture, misfire, exhaust leakage, or a sensor signal problem can affect the test.
- Wiring or connector fault
- Vehicle-specific operating condition
What to check
- Save codes and freeze-frame information
- Resolve misfire and mixture faults first, then verify Bank 2 sensor signals and the catalyst monitor using vehicle-specific procedures.
- Compare live data with vehicle specifications
- Confirm the repair under the conditions that set the code
- Resolve misfire and mixture faults first, then verify Bank 2 sensor signals and the catalyst monitor using vehicle-specific procedures.
- Repair the confirmed cause and verify the result
Also written as: P0433-00, P043300, PO433 (some scan tools add the fault-type byte, e.g. -00).