The way the heater core is designed it sits at a low point in the cooling system. It seems to be inherent in the Passat design.1,156 Posts. I have a 2015 golf tdi and don't have this problem. It slides out of the heater box on the drivers side. Check the appropriate repair manual or repair database for the exact code definition.1,156 Posts. Note: The definition of code P2457 can differ according to the vehicle manufacturer. If the computer doesn’t get the right response, it will set the generic code P2457. Finally the check …The PCM regularly checks the EGR cooling system to see if the latter is doing its job. P2457 was EGR cooling system performance. My UltraGauge scanner started showing 2 trouble codes: P040B was EGR Sensor B Circuit Hi and. For $7E8, it's code is p2457, which is exhaust gas recirculation cooling. I used my own OBD reader and found 2 errors: $7E8 and $7EC. It was until yesterday, at 101,500 km, the car showed up first time for the check engine light. Exhaust temperature sensor codes.Till now, it's kind of a layer of black soot around the tube. There may be no symptoms when this code is stored. Checked with Autologic: 10EF100 (P10EF00) Component 'B16/14. I also had the same message (P2457)on my OBD2 reader. P2457 I like to confirm same answer as above.
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