P0432 OBD-II: Main Catalyst Efficiency Below Threshold
P0432 Severity
Should you fix P0432 yourself?
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
What causes OBD-II fault code P0432?
The Catalytic Converter takes the exhaust gases left over by the combustion process and converts those gases to harmless emissions. The engine control module (PCM) compares the front and rear oxygen sensors to each other to determine catalytic converter efficiency. If the input from the rear oxygen sensor starts to match the front oxygen sensor, the PCM will set code P0432.Catalytic converters are covered under federally mandated 8yr/80,000 mile warranty by the vehicle's manufacturer. Catalytic converters usually fail as a result of something else (engine misfire, internal oil leak, or internal coolant leak) not being repaired. The original cause of the failure is usually not covered under warranty.
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What Does OBD-II Fault Code P0432 Mean?
OBD-II Code P0432 is defined as Main Catalyst Efficiency Below Threshold (Bank 2). This means the catalytic converter in engine bank 2 is working below efficiency.
Symptoms
- The check engine light will illuminate.
- The engine may hesitate, or there may be a loss of power.
- The engine may stall.
- The engine may hiss while accelerating.
Get it diagnosed by a professional
The Basics
P0432 is related to a bad catalytic converter, but it may be actually caused by a bad oxygen sensor or an exhaust leak. If left unchecked, it can potentially damage other components. Have the problem diagnosed before doing any repairs, as catalytic converters are expensive — it the cause is not found, you may have to replace it again.
Ask our experts about P0432.
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