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I need your help. My check engine light came on, so I drove to a local auto store to have the codes downloaded. As a result, the technician gave me these codes:
P1525, P1420 and P 1235. Whats the best way to take care of these codes? I've owned my ride since Nov of 2014 and this is the first issue I 've had. I noticed the check engine light came on after I put fuel in the car. I 've checked the gas cap to ensure its on secure. Any help is appreciated. Thanks.
Klatu
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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96,379 Posts

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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96,379 Posts
P1420 Catalyst Temperature Sensor Failure

P1525 Air Bypass Valve System

P1235 Fuel Pump Control Out Of Range
 
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