- Sensors and controls.
- Exhaust gas recirculation pipe unions.
- Exhaust gas recirculation tube for cracks.
- Vacuum pipes for leaks.
| - Loose or corroded connection to the exhaust gas recirculation regulator.
- Loose or corroded connections to the exhaust gas recirculation pressure transducer.
- Loose or corroded powertrain control module electrical connector.
- Wiring harness(es).
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