P0432 Code - Main Catalyst Efficiency Below Threshold Bank 2

What Does P0432 Mean?

The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions. When you see P0432 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0432 ?

The P0432 code may be caused by a number of problems, including the following:

• A failed catalytic converter (note that there are multiple reasons failure, including excess fuel being dumped into the exhaust, premature failure, internal component melting and more)
• A failed oxygen sensor
• A leak in the exhaust system above the catalytic converter

How do you troubleshoot P0432 ?

Now, clear the codes and test-drive the vehicle to see if the code is reset. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code P0432 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0432.

Fortunately, P0432 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.



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