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1997 JEEP CHEROKEE
4.0L I6•AWD•AUTOMATIC•gas
10 active safety recalls on this vehicle — view recalls
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Repairs0Labor508Torque2225Fluid10DTC886Battery1Maintenance0Recalls10
P0400moderate severityPowertrain

Exhaust Gas Recirculation (EGR) Flow

on 1997 Jeep Cherokee 4.0L I6 · AWD

What this code means

The EGR system flow is not within expected parameters.

Symptoms

  • Check Engine Light
  • Rough idle
  • Pinging/knocking
  • Increased NOx emissions
  • Failed emissions test

Common causes

  • Clogged EGR passages
  • Faulty EGR valve
  • EGR valve stuck closed
  • Carbon buildup
  • Vacuum line issue

Diagnostic steps

  1. Test EGR valve operation
  2. Check EGR passages for carbon buildup
  3. Test vacuum supply to EGR valve
  4. Monitor EGR position with scan tool
  5. Inspect EGR tube

Repair notes

Clean EGR valve and passages. Replace EGR valve if stuck or faulty.

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