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Has the error memory already been read out?
If not, you should have it done.
The error code says more. In general, one can only say that the preheating lamp which lights up while driving or flashes indicates a problem with the exhaust aftertreatment (e.g. O2 sensor, or EGR valve).
As long as the car is running normally this is not a problem, but before the MOT the problem should be solved.
You are also welcome to report the error code once it has been read, we will then narrow down the problem together.
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