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Four Wheel Drive,PSM,Brake Boost Warning Lights

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Wondered if you chaps can help? Recently acquired a 04 CT. The gentleman I purchased the vehicle from stated that he had let the battery die completely and had left it, however when he replaced it these three warning lights were illuminated.Had the fault codes cleared at an independant and all ok for a day, took the car up to 80mph and they all came back, took the car to an OPC who had the car three days said the had pressurised the braking system and cleared all the codes, drove the car all was ok for half an hour then the Four Wheel Drive light came on swiftly followed by the PSM light. Stopped turned the engine off waited all ok then 15 mins later Brake Boost came on but the other lights stayed off. Whilst these lights are on or coming on the car drives and stops perfectly, somewhat at a loss? Do I go back to the OPC and say sorry can you really fix it and be charged all over again or try another OPC/ Independant

Many thanks in advance

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Did they clean the ground connections to the chassis when they replaced the battery. Poor grounds can cause all kind of strange anomalies.

I would check the easy stuff first and if that does not work then find a shop with either Porsche PST2, PIWIS tester, or at least Durametric software for further diagnostics.

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