UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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Inspect for water damage or water under the passenger front seat area,I have seen issues with water entering this area and damaging the front SAM control unit and other electronics causing issues like this here.If this has already been checked and found to be o.k. let me know so we can continue from here.
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It is possible the relay was defective due to a short with the front sam and the new relay may have corrected the issue temporarily until the new relay shorted out/failed.I apologize as I didnt see the year on the model and thought this was a 164 chassis.
This does sound like the Front sam itself at fault here with it needing replaced and the relay may need replaced as well again after the sam replacement.I would have this checked into/tested further to be sure that this is the cause here before having it replaced.