AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Honda - P0401 1996 Honda Civic

P0401 1996 Honda Civic Code - Exhaust Gas Recirculation Insufficient Flow

- Code Popularity: 5,467 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P0401 1996 Honda Civic?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Exhaust Gas Recirculation Valve harness is open or shorted
  • Exhaust Gas Recirculation Valve circuit poor electrical connection
  • Faulty Exhaust Gas Recirculation Valve
  • Exhaust Gas Recirculation Valve clogged
  • Exhaust gas leaks
⚠ Does your Honda have Safety Recalls? → Check here

How to Fix the DTC P0401 1996 Honda Civic?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

The EGR system tends to get clogged with carbon built up. You can try to clean the EGR valve and its tubing before replacing anything.

Search for P0401 1996 Honda Civic Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0401 1996 Honda Civic code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

Low EGR flow control is detected

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine hesitation

Code P0401 1996 Honda Civic Description

The exhaust gas recirculation (EGR) system reduces oxides of nitrogen (NOx). NOx is generated by high combustion temperatures.
The EGR system lowers peak combustion temperature by recirculating inactive exhaust gas into the air/fuel mixture, thus reducing NOx emissions.
The EGR valve position sensor is built into the EGR valve and detects the amount of valve lift. The command value for the target valve lift is previously stored in the Powertrain Control Module (PCM) so that exhaust gas recirculation can be optimized according to driving conditions.
Comparing this command value with the EGR valve position sensor output signal value, the PCM controls the EGR valve to make the amount of actual valve lift equal to the command value.
If the EGR valve position sensor output signal value differs greatly from the command value in the PCM memory for a set period of time, the EGR valve or the EGR valve position sensor is considered faulty and a DTC is stored.
OBDII Code P0401 1996 Honda Civic - Exhaust Gas Recirculation Insufficient Flow - AutoCodes.com
P0401 1996 Honda Civic Code - Exhaust Gas Recirculation Insufficient Flow

Need More Information on the Code?

Need more information on how to fix the P0401 1996 Honda Civic code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0401 1996 Honda Civic code diagnosed by a professional: Find a repair shop in your area

Code P0401 1996 Honda Civic comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P0401 1996 Honda Civic code? Have you replaced any parts?
Any information is appreciated. Thanks