: Because the air-fuel mixture becomes unbalanced, the car may shake or fluctuate aggressively while idling.

: The most common symptom is an immediate warning light on the dash or iDrive screen.

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| Repair Type | Estimated Cost (USD) | Repair Type | Estimated Cost (USD) | | :--- | :--- | :--- | :--- | | Diagnostics Fee | $100 - $200 | Diagnostics Fee | $100 - $200 | | EGR Valve/Cooler Cleaning | $200 - $400 | EGR Valve/Cooler Cleaning | $200 - $400 | | EGR Valve Replacement | $400 - $800 (incl. parts & labor) | EGR Valve Replacement | $400 - $800 (incl. parts & labor) | | Intake Decarbonization | $500 - $1,000 | Intake Decarbonization | $500 - $1,000 | | DPF Replacement | $2,000 - $4,000+ | DPF Replacement | $2,000 - $4,000+ |

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