How To Fix Honda Engine Error Code P3400

By | August 4, 2019

How To Fix Honda Engine Error Codes P3400 Sensor
A video is at the bottom of the page for a visual walk-through id needed.

A Honda with a Error CodeP3400 is a Cylinder Deactivation System Bank 1.

Possible Causes Engine Error Code P3400

  • Defective cylinder deactivation solenoid
  • An open or short in the cylinder deactivation solenoid harness
  • A bad electrical connection in the cylinder deactivation solenoid circuit
  • Defective mass airflow sensor
  • Defective throttle position sensor
  • Defective intake control manifold absolute pressure sensor
  • Defective lifters
  • Restricted oil passages
  • Low engine oil level
  • Poor oil pressure on the lifters

A P3400 Error Code in a Honda is often a bad oil pressure switch sensor.

While this is a common cause it is not the only thing that can give a Error Code P3400.

Often the oil pressure switch sensor is replaced first since it is a common problem and low-cost part.

Example Honda Oil Pressure Switch on Amazon
Beck Arnley 201-1649 Oil Pressure Switch With Light

How To Fix Honda Engine Error Code P3400 (Replace Oil Pressure Sensor)

  1. Bad wiring or ECM could also cause this error code with the sensor the usual problem.
  2. How To Fix Honda Engine Error Codes P3400 Pic 2
    The Sensor is located at the right rear of the engine behind the throttle body.

  3. It will have a wire plug harness that will need to come off to remove it.
  4. How To Fix Honda Engine Error Codes P3400

  5. A 24 mm Deep Socket will need to be used to remove it.
  6. Once the old sensor is removed install the new unit making sure it seals good as to not leak oil.
  7. How To Fix Honda Engine Error Codes P3400 Pic 4

Summary
Fixing a P3400 is usually easy enough and falls in the backyard mechanic DIY category.

Of course call a professional if in-doubt.

The make and model of a vehicle will make a difference as some will be easier to work on than others.




 




 

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