P0393 Code - Camshaft Position Sensor 'B' Circuit High Bank 2

What Does P0393 Mean?

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. When you see P0393 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0393 ?

The most common cause of the P0393 code is damaged electrical components, such as wiring, due to leaking oil or other engine fluid. Other causes may include:

• Contaminated engine fluid
• Bad camshaft sensors
• Bad crankshaft sensors
• Faulty starter motor
• Weak battery
• Faulty starting system circuit

How do you troubleshoot P0393 ?

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. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

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