P0401 is an error code that indicates a problem with the exhaust gas recirculation (EGR) system. This code is often caused by a clogged EGR valve or restricted EGR passage. A clogged EGR valve can cause the engine to run too lean, while a restricted EGR passage can cause the engine to run too rich. Both of these conditions can lead to engine damage.
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- error code p0401
1. Clean or replace the EGR valve
- Remove the engine cover.
- Locate the EGR valve and remove the cover.
- Clean the EGR valve with a clean cloth.
- Replace the EGR valve cover.
2. Clean the EGR valve passages
- Remove the screws that hold the EGR valve in place.
- Carefully pull the EGR valve out of the engine.
- Inspect the passages for debris or oil.
- Clean the passages using a solvent and a cotton swab.
- Reinstall the EGR valve and screws.
3. Replace the DPFE sensor
- Disconnect the negative battery cable.
- Remove the cover.
- Remove the front air intake scoop.
- Remove the air filter.
- Remove the DPFE sensor.
- Clean the sensor and replace if necessary.
- Reinstall the air filter, front air intake scoop, and cover.
- reconnect the negative battery cable.
4. Clean the DPFE sensor passages
2.Remove the DPFE sensor 3.Clean the sensor passages 4.Reinstall the DPFE sensor
5. Replace the EGR vacuum regulator solenoid
- Remove the front bumper cover.
- Remove the passenger side airbag.
- Remove the two screws that hold the EGR pipe to the intake manifold.
- Loosen the EGR pipe clamp.
- Remove the EGR pipe.
- Clean the EGR valve and the intake manifold. 7.Install the new EGR valve and tighten the clamp.
- Install the EGR pipe and screws.
- Replace the front bumper cover.
Some users might also have success with the following opitons:
- Perform a smoke test on the EGR system.
- Check for leaks in the EGR system.
- Check for a clogged or restricted catalytic converter.
- Check for intake manifold leaks.
- Check the PCV system for leaks.