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SERVICE ENGINE SOON/PO401

(2002 Mitsubishi Eclipse)
in Sacramento, CA on April 10, 2012
$2,000.00 in repair costs.
Mitsubishi Dealer Repair Shop working on it and still can't fix it.
Replaced EGR Solenoid with a new one.
New Oxygen Sensor.
Increased Sensitivity of System for $110.00
Remove EGR and clear blockage for $220.00
Replaced Computer (MR578504) for $800.45

Service Engine Soon / Code PO401 came back...

After all these repairs that did not fix the problem, should I look for help from the Department of Automotive Repair? I spent my last dime on gas returning the car to the shop. Please help!

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