UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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A computer is what controls this operation, so the best thing to do is scan the whole computer system for codes and errors. Data that's given can help in narrowing down why this is happening from a defective computer to even just re-flashing and updating the current one.
There is no relay fir that, my original answer still stands. The scan tool is needed to check all the modules for codes, not just the pcm. A code reader will not do this function.