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OBDII Code List

P0400 1999 NISSAN ALTIMA SEDAN - Exhaust Gas Recirculation Function- No/Low Flow Detected

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3 What does this mean?

Possible causes

  • Exhaust Gas Recirculation (EGR) volume control valve stuck closed
  • Faulty Exhaust Gas Recirculation (EGR) volume control solenoid valve
  • Faulty EGR Valve
  • Faulty EGR temperature sensor and circuit
  • Exhaust Gas Recirculation (EGR) solenoid valve harness is open or shorted
  • Exhaust Gas Recirculation (EGR) solenoid valve circuit poor electrical connection
  • Dead (Weak) battery
What does this mean?

Tech notes

The P0400 code is very common with the Nissan Altima. The most likely caused of this problem is a clogged EGR valve or EGR flow passages. Before replacing any parts try cleaning the EGR valve, tube and passages with throttle body or carburetor cleaner. Also check for damage or loose vacuum hoses to the EGR valve.
What does this mean?

When is the code detected?

Exhaust Gas Recirculation (EGR) flow control is not responding

Possible symptoms

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

P0400 1999 NISSAN ALTIMA SEDAN Description

Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.
OBDII Code P0400 1999 Nissan Altima Sedan - Exhaust Gas Recirculation Function- No/Low Flow Detected -

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P0400 1999 NISSAN ALTIMA SEDAN Comments

Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P0400 1999 Nissan Altima Sedan code? Have you replaced any parts?
Any information is appreciated. Thanks
Repair Importance Level: 2
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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