AutoCodes - Honda - P0401 1999 HONDA ACCORD

P0401 1999 HONDA ACCORD Code - Exhaust Gas Recirculation Insufficient Flow

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3
Table of contents

|P0401 1999 HONDA ACCORD code possible causes

  • Exhaust Gas Recirculation Valve clogged
  • Faulty Exhaust Gas Recirculation Valve
  • Exhaust Gas Recirculation Valve harness is open or shorted
  • Exhaust Gas Recirculation Valve circuit poor electrical connection
  • Exhaust gas leaks

|How do I fix the P0401 1999 HONDA ACCORD code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P0401 1999 HONDA ACCORD code tech notes

The problem is common in most 1999 Honda Accord. The factory released a bulletin with instructions on how to clean the intake system.
1999 Honda Accord EGR Port Clogging OBDII Code P0401

|Cost of diagnosing the P0401 1999 HONDA ACCORD code

Labor: 1.0

The cost of diagnosing the P0401 1999 HONDA ACCORD code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P0401 1999 HONDA ACCORD code detected?

Low EGR flow control is detected

|What are P0401 1999 HONDA ACCORD code possible symptoms?

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

|P0401 1999 HONDA ACCORD code 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 1999 Honda Accord - Exhaust Gas Recirculation Insufficient Flow - AutoCodes.com

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|P0401 1999 HONDA ACCORD code comments

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