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Code : P0239
Description : P0239 MERCEDES-BENZ Turbocharger/Supercharger Boost Sensor ‘B’ Circuit Malfunction
Possible causes :
– Boost pressure sensor harness is open or shorted
– Boost pressure sensor circuit poor electrical connection
– Faulty boost pressure sensor
– Faulty Turbo/Super Charger
– Engine over temperature
– Ignition misfire exceeds the calibrated threshold
– Faulty Knock
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.

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